[JBoss JIRA] (MODCLUSTER-372) Number of registered contexts negatively affects mod_cluster performance
by Michal Babacek (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-372?page=com.atlassian.jira.pl... ]
Michal Babacek updated MODCLUSTER-372:
--------------------------------------
Attachment: httpd.conf
> Number of registered contexts negatively affects mod_cluster performance
> ------------------------------------------------------------------------
>
> Key: MODCLUSTER-372
> URL: https://issues.jboss.org/browse/MODCLUSTER-372
> Project: mod_cluster
> Issue Type: Bug
> Affects Versions: 1.2.4.Final, 1.2.6.Final
> Environment: RHEL6, other platforms are to be confirmed.
> Reporter: Michal Babacek
> Assignee: Michal Babacek
> Labels: mod_cluster, performace
> Fix For: 1.2.7.Final, 1.3.0.Alpha2
>
> Attachments: 4-workers-1-context-balancer-cpu.png, 4-workers-61-context-accessing-1-balancer-cpu.png, 9-workers-1-context-balancer-cpu.png, 9-workers-31-context-accessing-1-balancer-cpu.png, 9-workers-31-context-round-robin-balancer-cpu.png, httpd.conf
>
>
> There is a performance concern regarding CPU usage on the Apache HTTP Server with mod_cluster set up as a load balancer. Perf tests revealed that the major variable affecting the CPU usage is the overall number of registered contexts. It's noteworthy that these contexts actually don't need to be accessed at all, it's enough that they are present.
> Stay tuned for some profiler outputs...
> The first test [9 workers, 31 contexts, round robin|https://issues.jboss.org/browse/MODCLUSTER-372#9workers,31contexts,...] depicts a behavior where all contexts are being accessed in a round robin fashion. Note the CPU usage. If we compare it to the [9 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372#9workers,1context] test, it becomes apparent that there is something wrong with the CPU usage. As it is clear from the [9 workers, 31 contexts, access 1|https://issues.jboss.org/browse/MODCLUSTER-372#9workers,31contexts,acce...] test, accessing only one of these contexts doesn't help much.
> The last two tests, [4 workers, 61 contexts, accessing 1|https://issues.jboss.org/browse/MODCLUSTER-372#4workers,61contexts,acce...] and [4 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372#4workers,1context] confirm the results, environment differs only in number of nodes and number of contexts.
> h3. 9 workers, 31 contexts, round robin
> !9-workers-31-context-round-robin-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8843|147.4|15|60|0|8843|100%|
> |9|250|250|14422|240.3|37|215|0|14422|100%|
> |9|350|350|17551|292.5|196|443|0|17551|100%|
> |9|450|450|21303|355.0|269|603|0|21303|100%|
> |9|550|550|24818|413.6|325|686|0|24818|100%|
> |9|650|650|26804|446.7|469|800|0|26804|100%|
> |9|750|750|29930|498.8|507|985|0|29930|100%|
> |9|850|850|30665|511.0|665|1185|0|30665|100%|
> |9|950|950|34421|573.6|647|1316|0|34421|100%|
> |9|1050|1050|35067|584.4|800|1487|0|35067|100%|
> |9|1150|1150|36024|600.4|925|1612|0|36024|100%|
> |9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
> |9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
> |9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
> |9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
> |9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
> |9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
> |9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
> |9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
> |9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
> |9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
> |9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
> h3. 9 workers, 31 contexts, accessing only one of them
> !9-workers-31-context-accessing-1-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8954|149.2|4|42|0|8954|100%|
> |9|250|250|14897|248.3|7|33|0|14897|100%|
> |9|350|350|20784|346.4|8|68|0|20784|100%|
> |9|450|450|26748|445.8|8|69|0|26748|100%|
> |9|550|550|32553|542.5|11|92|0|32553|100%|
> |9|650|650|38558|642.6|10|60|0|38558|100%|
> |9|750|750|43571|726.1|29|329|0|43571|100%|
> |9|850|850|46133|768.8|99|494|0|46133|100%|
> |9|950|950|50854|847.5|120|501|0|50854|100%|
> |9|1050|1050|54451|907.4|154|584|0|54451|100%|
> |9|1150|1150|59961|999.3|138|674|0|59961|100%|
> |9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
> |9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
> |9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
> |9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
> |9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
> |9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
> |9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
> |9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
> |9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
> |9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
> |9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
> h3. 9 workers, 1 context
> !9-workers-1-context-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8965|149.4|2|12|0|8965|100%|
> |9|250|250|14965|249.4|2|22|0|14965|100%|
> |9|350|350|20950|349.1|2|23|0|20950|100%|
> |9|450|450|26941|449.0|2|26|0|26941|100%|
> |9|550|550|32937|548.9|1|26|0|32937|100%|
> |9|650|650|38900|648.3|1|19|0|38900|100%|
> |9|750|750|44918|748.6|1|11|0|44918|100%|
> |9|850|850|50902|848.3|2|22|0|50902|100%|
> |9|950|950|56878|947.9|1|14|0|56878|100%|
> |9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
> |9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
> |9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
> |9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
> |9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
> |9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
> |9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
> |9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
> |9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
> |9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
> |9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
> |9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
> |9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
> h3. 4 workers, 61 contexts, accessing only one of them
> !4-workers-61-context-accessing-1-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |4|500|500|29796|496.6|6|52|0|29796|100%|
> |4|650|650|38706|645.0|7|149|0|38706|100%|
> |4|800|800|47585|793.0|8|129|0|47585|100%|
> |4|950|950|54467|907.7|43|377|0|54467|100%|
> |4|1100|1100|62500|1,041.6|54|396|0|62500|100%|
> |4|1250|1250|69446|1,157.3|81|512|0|69446|100%|
> |4|1400|1400|76217|1,270.2|97|517|0|76217|100%|
> |4|1550|1550|80216|1,336.8|152|810|0|80216|100%|
> |4|1700|1700|80797|1,346.5|271|864|0|80797|100%|
> |4|1850|1850|94172|1,569.3|182|822|0|94172|100%|
> |4|2000|1916|91014|1,516.8|253|48650|0|91014|100%|
> |4|2150|1916|95852|1,597.4|205|848|83|95769|99%|
> h3. 4 workers, 1 context
> !4-workers-1-context-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |4|500|500|29922|498.7|2|39|0|29922|100%|
> |4|650|650|38923|648.7|1|39|0|38923|100%|
> |4|800|800|47916|798.5|1|17|0|47916|100%|
> |4|950|950|56896|948.2|1|17|0|56896|100%|
> |4|1100|1100|65889|1,098.1|1|115|0|65889|100%|
> |4|1250|1250|74874|1,247.8|1|101|0|74874|100%|
> |4|1400|1400|83818|1,396.8|1|17|0|83818|100%|
> |4|1550|1550|92830|1,547.0|1|17|0|92830|100%|
> |4|1700|1700|101805|1,696.6|1|11|0|101805|100%|
> |4|1850|1850|110785|1,846.3|1|11|0|110785|100%|
> |4|2000|1916|113747|1,895.6|10|53108|0|113747|100%|
> |4|2150|1916|114825|1,913.6|1|24|83|114742|99%|
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[JBoss JIRA] (MODCLUSTER-372) Number of registered contexts negatively affects mod_cluster performance
by Michal Babacek (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-372?page=com.atlassian.jira.pl... ]
Michal Babacek updated MODCLUSTER-372:
--------------------------------------
Description:
There is a performance concern regarding CPU usage on the Apache HTTP Server with mod_cluster set up as a load balancer. Perf tests revealed that the major variable affecting the CPU usage is the overall number of registered contexts. It's noteworthy that these contexts actually don't need to be accessed at all, it's enough that they are present.
Stay tuned for some profiler outputs...
The first test [9 workers, 31 contexts, round robin|https://issues.jboss.org/browse/MODCLUSTER-372#9workers,31contexts,...] depicts a behavior where all contexts are being accessed in a round robin fashion. Note the CPU usage. If we compare it to the [9 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372#9workers,1context] test, it becomes apparent that there is something wrong with the CPU usage. As it is clear from the [9 workers, 31 contexts, access 1|https://issues.jboss.org/browse/MODCLUSTER-372#9workers,31contexts,acce...] test, accessing only one of these contexts doesn't help much.
The last two tests, [4 workers, 61 contexts, accessing 1|https://issues.jboss.org/browse/MODCLUSTER-372#4workers,61contexts,acce...] and [4 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372#4workers,1context] confirm the results, environment differs only in number of nodes and number of contexts.
h3. 9 workers, 31 contexts, round robin
!9-workers-31-context-round-robin-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8843|147.4|15|60|0|8843|100%|
|9|250|250|14422|240.3|37|215|0|14422|100%|
|9|350|350|17551|292.5|196|443|0|17551|100%|
|9|450|450|21303|355.0|269|603|0|21303|100%|
|9|550|550|24818|413.6|325|686|0|24818|100%|
|9|650|650|26804|446.7|469|800|0|26804|100%|
|9|750|750|29930|498.8|507|985|0|29930|100%|
|9|850|850|30665|511.0|665|1185|0|30665|100%|
|9|950|950|34421|573.6|647|1316|0|34421|100%|
|9|1050|1050|35067|584.4|800|1487|0|35067|100%|
|9|1150|1150|36024|600.4|925|1612|0|36024|100%|
|9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
|9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
|9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
|9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
|9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
|9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
|9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
|9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
|9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
|9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
|9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
h3. 9 workers, 31 contexts, accessing only one of them
!9-workers-31-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8954|149.2|4|42|0|8954|100%|
|9|250|250|14897|248.3|7|33|0|14897|100%|
|9|350|350|20784|346.4|8|68|0|20784|100%|
|9|450|450|26748|445.8|8|69|0|26748|100%|
|9|550|550|32553|542.5|11|92|0|32553|100%|
|9|650|650|38558|642.6|10|60|0|38558|100%|
|9|750|750|43571|726.1|29|329|0|43571|100%|
|9|850|850|46133|768.8|99|494|0|46133|100%|
|9|950|950|50854|847.5|120|501|0|50854|100%|
|9|1050|1050|54451|907.4|154|584|0|54451|100%|
|9|1150|1150|59961|999.3|138|674|0|59961|100%|
|9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
|9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
|9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
|9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
|9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
|9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
|9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
|9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
|9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
|9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
|9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
h3. 9 workers, 1 context
!9-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8965|149.4|2|12|0|8965|100%|
|9|250|250|14965|249.4|2|22|0|14965|100%|
|9|350|350|20950|349.1|2|23|0|20950|100%|
|9|450|450|26941|449.0|2|26|0|26941|100%|
|9|550|550|32937|548.9|1|26|0|32937|100%|
|9|650|650|38900|648.3|1|19|0|38900|100%|
|9|750|750|44918|748.6|1|11|0|44918|100%|
|9|850|850|50902|848.3|2|22|0|50902|100%|
|9|950|950|56878|947.9|1|14|0|56878|100%|
|9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
|9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
|9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
|9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
|9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
|9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
|9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
|9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
|9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
|9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
|9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
|9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
|9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
h3. 4 workers, 61 contexts, accessing only one of them
!4-workers-61-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29796|496.6|6|52|0|29796|100%|
|4|650|650|38706|645.0|7|149|0|38706|100%|
|4|800|800|47585|793.0|8|129|0|47585|100%|
|4|950|950|54467|907.7|43|377|0|54467|100%|
|4|1100|1100|62500|1,041.6|54|396|0|62500|100%|
|4|1250|1250|69446|1,157.3|81|512|0|69446|100%|
|4|1400|1400|76217|1,270.2|97|517|0|76217|100%|
|4|1550|1550|80216|1,336.8|152|810|0|80216|100%|
|4|1700|1700|80797|1,346.5|271|864|0|80797|100%|
|4|1850|1850|94172|1,569.3|182|822|0|94172|100%|
|4|2000|1916|91014|1,516.8|253|48650|0|91014|100%|
|4|2150|1916|95852|1,597.4|205|848|83|95769|99%|
h3. 4 workers, 1 context
!4-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29922|498.7|2|39|0|29922|100%|
|4|650|650|38923|648.7|1|39|0|38923|100%|
|4|800|800|47916|798.5|1|17|0|47916|100%|
|4|950|950|56896|948.2|1|17|0|56896|100%|
|4|1100|1100|65889|1,098.1|1|115|0|65889|100%|
|4|1250|1250|74874|1,247.8|1|101|0|74874|100%|
|4|1400|1400|83818|1,396.8|1|17|0|83818|100%|
|4|1550|1550|92830|1,547.0|1|17|0|92830|100%|
|4|1700|1700|101805|1,696.6|1|11|0|101805|100%|
|4|1850|1850|110785|1,846.3|1|11|0|110785|100%|
|4|2000|1916|113747|1,895.6|10|53108|0|113747|100%|
|4|2150|1916|114825|1,913.6|1|24|83|114742|99%|
was:
There is a performance concern regarding CPU usage on the Apache HTTP Server with mod_cluster set up as a load balancer. Perf tests revealed that the major variable affecting the CPU usage is the overall number of registered contexts. It's noteworthy that these contexts actually don't need to be accessed at all, it's enough that they are present.
Stay tuned for some profiler outputs...
The first test [9 workers, 31 contexts, round robin|https://issues.jboss.org/browse/MODCLUSTER-372#9workers,31contexts,...] depicts a behavior where all contexts are being accessed in a round robin fashion. Note the CPU usage. If we compare it to the [9 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372#9workers,1context] test, it becomes apparent that there is something wrong with the CPU usage. As it is clear from the [9 workers, 31 contexts, access 1|https://issues.jboss.org/browse/MODCLUSTER-372#9workers,31contexts,acce...] test, accessing only one of these contexts doesn't help much.
The last two tests, [4 workers, 61 contexts, accessing 1|https://issues.jboss.org/browse/MODCLUSTER-372#4workers,61contexts,acce...] and [4 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372#4workers,1context] confirm the results, environment differs only in number of nodes and number of contexts.
h3. 9 workers, 31 contexts, round robin
!9-workers-31-context-round-robin-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8843|147.4|15|60|0|8843|100%|
|9|250|250|14422|240.3|37|215|0|14422|100%|
|9|350|350|17551|292.5|196|443|0|17551|100%|
|9|450|450|21303|355.0|269|603|0|21303|100%|
|9|550|550|24818|413.6|325|686|0|24818|100%|
|9|650|650|26804|446.7|469|800|0|26804|100%|
|9|750|750|29930|498.8|507|985|0|29930|100%|
|9|850|850|30665|511.0|665|1185|0|30665|100%|
|9|950|950|34421|573.6|647|1316|0|34421|100%|
|9|1050|1050|35067|584.4|800|1487|0|35067|100%|
|9|1150|1150|36024|600.4|925|1612|0|36024|100%|
|9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
|9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
|9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
|9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
|9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
|9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
|9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
|9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
|9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
|9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
|9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
h3. 9 workers, 31 contexts, accessing only one of them
!9-workers-31-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8954|149.2|4|42|0|8954|100%|
|9|250|250|14897|248.3|7|33|0|14897|100%|
|9|350|350|20784|346.4|8|68|0|20784|100%|
|9|450|450|26748|445.8|8|69|0|26748|100%|
|9|550|550|32553|542.5|11|92|0|32553|100%|
|9|650|650|38558|642.6|10|60|0|38558|100%|
|9|750|750|43571|726.1|29|329|0|43571|100%|
|9|850|850|46133|768.8|99|494|0|46133|100%|
|9|950|950|50854|847.5|120|501|0|50854|100%|
|9|1050|1050|54451|907.4|154|584|0|54451|100%|
|9|1150|1150|59961|999.3|138|674|0|59961|100%|
|9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
|9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
|9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
|9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
|9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
|9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
|9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
|9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
|9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
|9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
|9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
h3. 9 workers, 1 context
!9-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8965|149.4|2|12|0|8965|100%|
|9|250|250|14965|249.4|2|22|0|14965|100%|
|9|350|350|20950|349.1|2|23|0|20950|100%|
|9|450|450|26941|449.0|2|26|0|26941|100%|
|9|550|550|32937|548.9|1|26|0|32937|100%|
|9|650|650|38900|648.3|1|19|0|38900|100%|
|9|750|750|44918|748.6|1|11|0|44918|100%|
|9|850|850|50902|848.3|2|22|0|50902|100%|
|9|950|950|56878|947.9|1|14|0|56878|100%|
|9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
|9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
|9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
|9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
|9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
|9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
|9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
|9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
|9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
|9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
|9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
|9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
|9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
h3. 4 workers, 61 contexts, accessing only one of them
!4-workers-61-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29796|496.6|0.0|0|6|52|0|0|0|29796|100%|
|4|650|650|38706|645.0|0.0|0|7|149|0|0|0|38706|100%|
|4|800|800|47585|793.0|0.0|0|8|129|0|0|0|47585|100%|
|4|950|950|54467|907.7|0.0|0|43|377|0|0|0|54467|100%|
|4|1100|1100|62500|1,041.6|0.0|0|54|396|0|0|0|62500|100%|
|4|1250|1250|69446|1,157.3|0.0|0|81|512|0|0|0|69446|100%|
|4|1400|1400|76217|1,270.2|0.0|0|97|517|0|0|0|76217|100%|
|4|1550|1550|80216|1,336.8|0.0|0|152|810|0|0|0|80216|100%|
|4|1700|1700|80797|1,346.5|0.0|0|271|864|0|0|0|80797|100%|
|4|1850|1850|94172|1,569.3|0.0|0|182|822|0|0|0|94172|100%|
|4|2000|1916|91014|1,516.8|0.0|0|253|48650|0|0|0|91014|100%|
|4|2150|1916|95852|1,597.4|0.0|0|205|848|83|83|0|95769|99%|
h3. 4 workers, 1 context
!4-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29922|498.7|0.0|0|2|39|0|0|0|29922|100%|
|4|650|650|38923|648.7|0.0|0|1|39|0|0|0|38923|100%|
|4|800|800|47916|798.5|0.0|0|1|17|0|0|0|47916|100%|
|4|950|950|56896|948.2|0.0|0|1|17|0|0|0|56896|100%|
|4|1100|1100|65889|1,098.1|0.0|0|1|115|0|0|0|65889|100%|
|4|1250|1250|74874|1,247.8|0.0|0|1|101|0|0|0|74874|100%|
|4|1400|1400|83818|1,396.8|0.0|0|1|17|0|0|0|83818|100%|
|4|1550|1550|92830|1,547.0|0.0|0|1|17|0|0|0|92830|100%|
|4|1700|1700|101805|1,696.6|0.0|0|1|11|0|0|0|101805|100%|
|4|1850|1850|110785|1,846.3|0.0|0|1|11|0|0|0|110785|100%|
|4|2000|1916|113747|1,895.6|0.0|0|10|53108|0|0|0|113747|100%|
|4|2150|1916|114825|1,913.6|0.0|0|1|24|83|83|0|114742|99%|
> Number of registered contexts negatively affects mod_cluster performance
> ------------------------------------------------------------------------
>
> Key: MODCLUSTER-372
> URL: https://issues.jboss.org/browse/MODCLUSTER-372
> Project: mod_cluster
> Issue Type: Bug
> Affects Versions: 1.2.4.Final, 1.2.6.Final
> Environment: RHEL6, other platforms are to be confirmed.
> Reporter: Michal Babacek
> Assignee: Michal Babacek
> Labels: mod_cluster, performace
> Fix For: 1.2.7.Final, 1.3.0.Alpha2
>
> Attachments: 4-workers-1-context-balancer-cpu.png, 4-workers-61-context-accessing-1-balancer-cpu.png, 9-workers-1-context-balancer-cpu.png, 9-workers-31-context-accessing-1-balancer-cpu.png, 9-workers-31-context-round-robin-balancer-cpu.png
>
>
> There is a performance concern regarding CPU usage on the Apache HTTP Server with mod_cluster set up as a load balancer. Perf tests revealed that the major variable affecting the CPU usage is the overall number of registered contexts. It's noteworthy that these contexts actually don't need to be accessed at all, it's enough that they are present.
> Stay tuned for some profiler outputs...
> The first test [9 workers, 31 contexts, round robin|https://issues.jboss.org/browse/MODCLUSTER-372#9workers,31contexts,...] depicts a behavior where all contexts are being accessed in a round robin fashion. Note the CPU usage. If we compare it to the [9 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372#9workers,1context] test, it becomes apparent that there is something wrong with the CPU usage. As it is clear from the [9 workers, 31 contexts, access 1|https://issues.jboss.org/browse/MODCLUSTER-372#9workers,31contexts,acce...] test, accessing only one of these contexts doesn't help much.
> The last two tests, [4 workers, 61 contexts, accessing 1|https://issues.jboss.org/browse/MODCLUSTER-372#4workers,61contexts,acce...] and [4 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372#4workers,1context] confirm the results, environment differs only in number of nodes and number of contexts.
> h3. 9 workers, 31 contexts, round robin
> !9-workers-31-context-round-robin-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8843|147.4|15|60|0|8843|100%|
> |9|250|250|14422|240.3|37|215|0|14422|100%|
> |9|350|350|17551|292.5|196|443|0|17551|100%|
> |9|450|450|21303|355.0|269|603|0|21303|100%|
> |9|550|550|24818|413.6|325|686|0|24818|100%|
> |9|650|650|26804|446.7|469|800|0|26804|100%|
> |9|750|750|29930|498.8|507|985|0|29930|100%|
> |9|850|850|30665|511.0|665|1185|0|30665|100%|
> |9|950|950|34421|573.6|647|1316|0|34421|100%|
> |9|1050|1050|35067|584.4|800|1487|0|35067|100%|
> |9|1150|1150|36024|600.4|925|1612|0|36024|100%|
> |9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
> |9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
> |9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
> |9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
> |9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
> |9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
> |9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
> |9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
> |9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
> |9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
> |9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
> h3. 9 workers, 31 contexts, accessing only one of them
> !9-workers-31-context-accessing-1-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8954|149.2|4|42|0|8954|100%|
> |9|250|250|14897|248.3|7|33|0|14897|100%|
> |9|350|350|20784|346.4|8|68|0|20784|100%|
> |9|450|450|26748|445.8|8|69|0|26748|100%|
> |9|550|550|32553|542.5|11|92|0|32553|100%|
> |9|650|650|38558|642.6|10|60|0|38558|100%|
> |9|750|750|43571|726.1|29|329|0|43571|100%|
> |9|850|850|46133|768.8|99|494|0|46133|100%|
> |9|950|950|50854|847.5|120|501|0|50854|100%|
> |9|1050|1050|54451|907.4|154|584|0|54451|100%|
> |9|1150|1150|59961|999.3|138|674|0|59961|100%|
> |9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
> |9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
> |9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
> |9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
> |9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
> |9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
> |9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
> |9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
> |9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
> |9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
> |9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
> h3. 9 workers, 1 context
> !9-workers-1-context-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8965|149.4|2|12|0|8965|100%|
> |9|250|250|14965|249.4|2|22|0|14965|100%|
> |9|350|350|20950|349.1|2|23|0|20950|100%|
> |9|450|450|26941|449.0|2|26|0|26941|100%|
> |9|550|550|32937|548.9|1|26|0|32937|100%|
> |9|650|650|38900|648.3|1|19|0|38900|100%|
> |9|750|750|44918|748.6|1|11|0|44918|100%|
> |9|850|850|50902|848.3|2|22|0|50902|100%|
> |9|950|950|56878|947.9|1|14|0|56878|100%|
> |9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
> |9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
> |9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
> |9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
> |9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
> |9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
> |9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
> |9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
> |9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
> |9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
> |9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
> |9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
> |9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
> h3. 4 workers, 61 contexts, accessing only one of them
> !4-workers-61-context-accessing-1-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |4|500|500|29796|496.6|6|52|0|29796|100%|
> |4|650|650|38706|645.0|7|149|0|38706|100%|
> |4|800|800|47585|793.0|8|129|0|47585|100%|
> |4|950|950|54467|907.7|43|377|0|54467|100%|
> |4|1100|1100|62500|1,041.6|54|396|0|62500|100%|
> |4|1250|1250|69446|1,157.3|81|512|0|69446|100%|
> |4|1400|1400|76217|1,270.2|97|517|0|76217|100%|
> |4|1550|1550|80216|1,336.8|152|810|0|80216|100%|
> |4|1700|1700|80797|1,346.5|271|864|0|80797|100%|
> |4|1850|1850|94172|1,569.3|182|822|0|94172|100%|
> |4|2000|1916|91014|1,516.8|253|48650|0|91014|100%|
> |4|2150|1916|95852|1,597.4|205|848|83|95769|99%|
> h3. 4 workers, 1 context
> !4-workers-1-context-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |4|500|500|29922|498.7|2|39|0|29922|100%|
> |4|650|650|38923|648.7|1|39|0|38923|100%|
> |4|800|800|47916|798.5|1|17|0|47916|100%|
> |4|950|950|56896|948.2|1|17|0|56896|100%|
> |4|1100|1100|65889|1,098.1|1|115|0|65889|100%|
> |4|1250|1250|74874|1,247.8|1|101|0|74874|100%|
> |4|1400|1400|83818|1,396.8|1|17|0|83818|100%|
> |4|1550|1550|92830|1,547.0|1|17|0|92830|100%|
> |4|1700|1700|101805|1,696.6|1|11|0|101805|100%|
> |4|1850|1850|110785|1,846.3|1|11|0|110785|100%|
> |4|2000|1916|113747|1,895.6|10|53108|0|113747|100%|
> |4|2150|1916|114825|1,913.6|1|24|83|114742|99%|
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[JBoss JIRA] (MODCLUSTER-372) Number of registered contexts negatively affects mod_cluster performance
by Michal Babacek (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-372?page=com.atlassian.jira.pl... ]
Michal Babacek updated MODCLUSTER-372:
--------------------------------------
Description:
There is a performance concern regarding CPU usage on the Apache HTTP Server with mod_cluster set up as a load balancer. Perf tests revealed that the major variable affecting the CPU usage is the overall number of registered contexts. It's noteworthy that these contexts actually don't need to be accessed at all, it's enough that they are present.
Stay tuned for some profiler outputs...
The first test [9 workers, 31 contexts, round robin|https://issues.jboss.org/browse/MODCLUSTER-372#9workers,31contexts,...] depicts a behavior where all contexts are being accessed in a round robin fashion. Note the CPU usage. If we compare it to the [9 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372#9workers,1context] test, it becomes apparent that there is something wrong with the CPU usage. As it is clear from the [9 workers, 31 contexts, access 1|https://issues.jboss.org/browse/MODCLUSTER-372#9workers,31contexts,acce...] test, accessing only one of these contexts doesn't help much.
The last two tests, [4 workers, 61 contexts, accessing 1|https://issues.jboss.org/browse/MODCLUSTER-372#4workers,61contexts,acce...] and [4 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372#4workers,1context] confirm the results, environment differs only in number of nodes and number of contexts.
h3. 9 workers, 31 contexts, round robin
!9-workers-31-context-round-robin-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8843|147.4|15|60|0|8843|100%|
|9|250|250|14422|240.3|37|215|0|14422|100%|
|9|350|350|17551|292.5|196|443|0|17551|100%|
|9|450|450|21303|355.0|269|603|0|21303|100%|
|9|550|550|24818|413.6|325|686|0|24818|100%|
|9|650|650|26804|446.7|469|800|0|26804|100%|
|9|750|750|29930|498.8|507|985|0|29930|100%|
|9|850|850|30665|511.0|665|1185|0|30665|100%|
|9|950|950|34421|573.6|647|1316|0|34421|100%|
|9|1050|1050|35067|584.4|800|1487|0|35067|100%|
|9|1150|1150|36024|600.4|925|1612|0|36024|100%|
|9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
|9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
|9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
|9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
|9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
|9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
|9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
|9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
|9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
|9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
|9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
h3. 9 workers, 31 contexts, accessing only one of them
!9-workers-31-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8954|149.2|4|42|0|8954|100%|
|9|250|250|14897|248.3|7|33|0|14897|100%|
|9|350|350|20784|346.4|8|68|0|20784|100%|
|9|450|450|26748|445.8|8|69|0|26748|100%|
|9|550|550|32553|542.5|11|92|0|32553|100%|
|9|650|650|38558|642.6|10|60|0|38558|100%|
|9|750|750|43571|726.1|29|329|0|43571|100%|
|9|850|850|46133|768.8|99|494|0|46133|100%|
|9|950|950|50854|847.5|120|501|0|50854|100%|
|9|1050|1050|54451|907.4|154|584|0|54451|100%|
|9|1150|1150|59961|999.3|138|674|0|59961|100%|
|9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
|9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
|9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
|9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
|9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
|9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
|9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
|9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
|9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
|9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
|9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
h3. 9 workers, 1 context
!9-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8965|149.4|2|12|0|8965|100%|
|9|250|250|14965|249.4|2|22|0|14965|100%|
|9|350|350|20950|349.1|2|23|0|20950|100%|
|9|450|450|26941|449.0|2|26|0|26941|100%|
|9|550|550|32937|548.9|1|26|0|32937|100%|
|9|650|650|38900|648.3|1|19|0|38900|100%|
|9|750|750|44918|748.6|1|11|0|44918|100%|
|9|850|850|50902|848.3|2|22|0|50902|100%|
|9|950|950|56878|947.9|1|14|0|56878|100%|
|9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
|9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
|9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
|9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
|9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
|9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
|9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
|9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
|9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
|9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
|9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
|9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
|9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
h3. 4 workers, 61 contexts, accessing only one of them
!4-workers-61-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29796|496.6|0.0|0|6|52|0|0|0|29796|100%|
|4|650|650|38706|645.0|0.0|0|7|149|0|0|0|38706|100%|
|4|800|800|47585|793.0|0.0|0|8|129|0|0|0|47585|100%|
|4|950|950|54467|907.7|0.0|0|43|377|0|0|0|54467|100%|
|4|1100|1100|62500|1,041.6|0.0|0|54|396|0|0|0|62500|100%|
|4|1250|1250|69446|1,157.3|0.0|0|81|512|0|0|0|69446|100%|
|4|1400|1400|76217|1,270.2|0.0|0|97|517|0|0|0|76217|100%|
|4|1550|1550|80216|1,336.8|0.0|0|152|810|0|0|0|80216|100%|
|4|1700|1700|80797|1,346.5|0.0|0|271|864|0|0|0|80797|100%|
|4|1850|1850|94172|1,569.3|0.0|0|182|822|0|0|0|94172|100%|
|4|2000|1916|91014|1,516.8|0.0|0|253|48650|0|0|0|91014|100%|
|4|2150|1916|95852|1,597.4|0.0|0|205|848|83|83|0|95769|99%|
h3. 4 workers, 1 context
!4-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29922|498.7|0.0|0|2|39|0|0|0|29922|100%|
|4|650|650|38923|648.7|0.0|0|1|39|0|0|0|38923|100%|
|4|800|800|47916|798.5|0.0|0|1|17|0|0|0|47916|100%|
|4|950|950|56896|948.2|0.0|0|1|17|0|0|0|56896|100%|
|4|1100|1100|65889|1,098.1|0.0|0|1|115|0|0|0|65889|100%|
|4|1250|1250|74874|1,247.8|0.0|0|1|101|0|0|0|74874|100%|
|4|1400|1400|83818|1,396.8|0.0|0|1|17|0|0|0|83818|100%|
|4|1550|1550|92830|1,547.0|0.0|0|1|17|0|0|0|92830|100%|
|4|1700|1700|101805|1,696.6|0.0|0|1|11|0|0|0|101805|100%|
|4|1850|1850|110785|1,846.3|0.0|0|1|11|0|0|0|110785|100%|
|4|2000|1916|113747|1,895.6|0.0|0|10|53108|0|0|0|113747|100%|
|4|2150|1916|114825|1,913.6|0.0|0|1|24|83|83|0|114742|99%|
was:
There is a performance concern regarding CPU usage on the Apache HTTP Server with mod_cluster set up as a load balancer. Perf tests revealed that the major variable affecting the CPU usage is the overall number of registered contexts. It's noteworthy that these contexts actually don't need to be accessed at all, it's enough that they are present.
Stay tuned for some profiler outputs...
The first test [9 workers, 31 contexts, round robin|https://issues.jboss.org/browse/MODCLUSTER-372#9workers%2C31context...] depicts a behavior where all contexts are being accessed in a round robin fashion. Note the CPU usage. If we compare it to the [9 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372#9workers%2C1context] test, it becomes apparent that there is something wrong with the CPU usage. As it is clear from the [9 workers, 31 contexts, access 1|https://issues.jboss.org/browse/MODCLUSTER-372#9workers%2C31contexts%2C...] test, accessing only one of these contexts doesn't help much.
The last two tests, [4 workers, 61 contexts, accessing 1|https://issues.jboss.org/browse/MODCLUSTER-372#4workers%2C61contexts%2C...] and [4 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372#4workers%2C1context] confirm the results, environment differs only in number of nodes and number of contexts.
h3. 9 workers, 31 contexts, round robin
!9-workers-31-context-round-robin-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8843|147.4|15|60|0|8843|100%|
|9|250|250|14422|240.3|37|215|0|14422|100%|
|9|350|350|17551|292.5|196|443|0|17551|100%|
|9|450|450|21303|355.0|269|603|0|21303|100%|
|9|550|550|24818|413.6|325|686|0|24818|100%|
|9|650|650|26804|446.7|469|800|0|26804|100%|
|9|750|750|29930|498.8|507|985|0|29930|100%|
|9|850|850|30665|511.0|665|1185|0|30665|100%|
|9|950|950|34421|573.6|647|1316|0|34421|100%|
|9|1050|1050|35067|584.4|800|1487|0|35067|100%|
|9|1150|1150|36024|600.4|925|1612|0|36024|100%|
|9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
|9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
|9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
|9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
|9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
|9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
|9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
|9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
|9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
|9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
|9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
h3. 9 workers, 31 contexts, accessing only one of them
!9-workers-31-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8954|149.2|4|42|0|8954|100%|
|9|250|250|14897|248.3|7|33|0|14897|100%|
|9|350|350|20784|346.4|8|68|0|20784|100%|
|9|450|450|26748|445.8|8|69|0|26748|100%|
|9|550|550|32553|542.5|11|92|0|32553|100%|
|9|650|650|38558|642.6|10|60|0|38558|100%|
|9|750|750|43571|726.1|29|329|0|43571|100%|
|9|850|850|46133|768.8|99|494|0|46133|100%|
|9|950|950|50854|847.5|120|501|0|50854|100%|
|9|1050|1050|54451|907.4|154|584|0|54451|100%|
|9|1150|1150|59961|999.3|138|674|0|59961|100%|
|9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
|9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
|9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
|9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
|9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
|9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
|9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
|9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
|9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
|9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
|9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
h3. 9 workers, 1 context
!9-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8965|149.4|2|12|0|8965|100%|
|9|250|250|14965|249.4|2|22|0|14965|100%|
|9|350|350|20950|349.1|2|23|0|20950|100%|
|9|450|450|26941|449.0|2|26|0|26941|100%|
|9|550|550|32937|548.9|1|26|0|32937|100%|
|9|650|650|38900|648.3|1|19|0|38900|100%|
|9|750|750|44918|748.6|1|11|0|44918|100%|
|9|850|850|50902|848.3|2|22|0|50902|100%|
|9|950|950|56878|947.9|1|14|0|56878|100%|
|9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
|9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
|9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
|9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
|9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
|9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
|9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
|9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
|9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
|9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
|9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
|9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
|9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
h3. 4 workers, 61 contexts, accessing only one of them
!4-workers-61-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29796|496.6|0.0|0|6|52|0|0|0|29796|100%|
|4|650|650|38706|645.0|0.0|0|7|149|0|0|0|38706|100%|
|4|800|800|47585|793.0|0.0|0|8|129|0|0|0|47585|100%|
|4|950|950|54467|907.7|0.0|0|43|377|0|0|0|54467|100%|
|4|1100|1100|62500|1,041.6|0.0|0|54|396|0|0|0|62500|100%|
|4|1250|1250|69446|1,157.3|0.0|0|81|512|0|0|0|69446|100%|
|4|1400|1400|76217|1,270.2|0.0|0|97|517|0|0|0|76217|100%|
|4|1550|1550|80216|1,336.8|0.0|0|152|810|0|0|0|80216|100%|
|4|1700|1700|80797|1,346.5|0.0|0|271|864|0|0|0|80797|100%|
|4|1850|1850|94172|1,569.3|0.0|0|182|822|0|0|0|94172|100%|
|4|2000|1916|91014|1,516.8|0.0|0|253|48650|0|0|0|91014|100%|
|4|2150|1916|95852|1,597.4|0.0|0|205|848|83|83|0|95769|99%|
h3. 4 workers, 1 context
!4-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29922|498.7|0.0|0|2|39|0|0|0|29922|100%|
|4|650|650|38923|648.7|0.0|0|1|39|0|0|0|38923|100%|
|4|800|800|47916|798.5|0.0|0|1|17|0|0|0|47916|100%|
|4|950|950|56896|948.2|0.0|0|1|17|0|0|0|56896|100%|
|4|1100|1100|65889|1,098.1|0.0|0|1|115|0|0|0|65889|100%|
|4|1250|1250|74874|1,247.8|0.0|0|1|101|0|0|0|74874|100%|
|4|1400|1400|83818|1,396.8|0.0|0|1|17|0|0|0|83818|100%|
|4|1550|1550|92830|1,547.0|0.0|0|1|17|0|0|0|92830|100%|
|4|1700|1700|101805|1,696.6|0.0|0|1|11|0|0|0|101805|100%|
|4|1850|1850|110785|1,846.3|0.0|0|1|11|0|0|0|110785|100%|
|4|2000|1916|113747|1,895.6|0.0|0|10|53108|0|0|0|113747|100%|
|4|2150|1916|114825|1,913.6|0.0|0|1|24|83|83|0|114742|99%|
> Number of registered contexts negatively affects mod_cluster performance
> ------------------------------------------------------------------------
>
> Key: MODCLUSTER-372
> URL: https://issues.jboss.org/browse/MODCLUSTER-372
> Project: mod_cluster
> Issue Type: Bug
> Affects Versions: 1.2.4.Final, 1.2.6.Final
> Environment: RHEL6, other platforms are to be confirmed.
> Reporter: Michal Babacek
> Assignee: Michal Babacek
> Labels: mod_cluster, performace
> Fix For: 1.2.7.Final, 1.3.0.Alpha2
>
> Attachments: 4-workers-1-context-balancer-cpu.png, 4-workers-61-context-accessing-1-balancer-cpu.png, 9-workers-1-context-balancer-cpu.png, 9-workers-31-context-accessing-1-balancer-cpu.png, 9-workers-31-context-round-robin-balancer-cpu.png
>
>
> There is a performance concern regarding CPU usage on the Apache HTTP Server with mod_cluster set up as a load balancer. Perf tests revealed that the major variable affecting the CPU usage is the overall number of registered contexts. It's noteworthy that these contexts actually don't need to be accessed at all, it's enough that they are present.
> Stay tuned for some profiler outputs...
> The first test [9 workers, 31 contexts, round robin|https://issues.jboss.org/browse/MODCLUSTER-372#9workers,31contexts,...] depicts a behavior where all contexts are being accessed in a round robin fashion. Note the CPU usage. If we compare it to the [9 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372#9workers,1context] test, it becomes apparent that there is something wrong with the CPU usage. As it is clear from the [9 workers, 31 contexts, access 1|https://issues.jboss.org/browse/MODCLUSTER-372#9workers,31contexts,acce...] test, accessing only one of these contexts doesn't help much.
> The last two tests, [4 workers, 61 contexts, accessing 1|https://issues.jboss.org/browse/MODCLUSTER-372#4workers,61contexts,acce...] and [4 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372#4workers,1context] confirm the results, environment differs only in number of nodes and number of contexts.
> h3. 9 workers, 31 contexts, round robin
> !9-workers-31-context-round-robin-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8843|147.4|15|60|0|8843|100%|
> |9|250|250|14422|240.3|37|215|0|14422|100%|
> |9|350|350|17551|292.5|196|443|0|17551|100%|
> |9|450|450|21303|355.0|269|603|0|21303|100%|
> |9|550|550|24818|413.6|325|686|0|24818|100%|
> |9|650|650|26804|446.7|469|800|0|26804|100%|
> |9|750|750|29930|498.8|507|985|0|29930|100%|
> |9|850|850|30665|511.0|665|1185|0|30665|100%|
> |9|950|950|34421|573.6|647|1316|0|34421|100%|
> |9|1050|1050|35067|584.4|800|1487|0|35067|100%|
> |9|1150|1150|36024|600.4|925|1612|0|36024|100%|
> |9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
> |9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
> |9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
> |9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
> |9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
> |9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
> |9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
> |9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
> |9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
> |9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
> |9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
> h3. 9 workers, 31 contexts, accessing only one of them
> !9-workers-31-context-accessing-1-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8954|149.2|4|42|0|8954|100%|
> |9|250|250|14897|248.3|7|33|0|14897|100%|
> |9|350|350|20784|346.4|8|68|0|20784|100%|
> |9|450|450|26748|445.8|8|69|0|26748|100%|
> |9|550|550|32553|542.5|11|92|0|32553|100%|
> |9|650|650|38558|642.6|10|60|0|38558|100%|
> |9|750|750|43571|726.1|29|329|0|43571|100%|
> |9|850|850|46133|768.8|99|494|0|46133|100%|
> |9|950|950|50854|847.5|120|501|0|50854|100%|
> |9|1050|1050|54451|907.4|154|584|0|54451|100%|
> |9|1150|1150|59961|999.3|138|674|0|59961|100%|
> |9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
> |9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
> |9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
> |9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
> |9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
> |9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
> |9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
> |9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
> |9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
> |9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
> |9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
> h3. 9 workers, 1 context
> !9-workers-1-context-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8965|149.4|2|12|0|8965|100%|
> |9|250|250|14965|249.4|2|22|0|14965|100%|
> |9|350|350|20950|349.1|2|23|0|20950|100%|
> |9|450|450|26941|449.0|2|26|0|26941|100%|
> |9|550|550|32937|548.9|1|26|0|32937|100%|
> |9|650|650|38900|648.3|1|19|0|38900|100%|
> |9|750|750|44918|748.6|1|11|0|44918|100%|
> |9|850|850|50902|848.3|2|22|0|50902|100%|
> |9|950|950|56878|947.9|1|14|0|56878|100%|
> |9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
> |9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
> |9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
> |9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
> |9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
> |9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
> |9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
> |9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
> |9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
> |9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
> |9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
> |9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
> |9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
> h3. 4 workers, 61 contexts, accessing only one of them
> !4-workers-61-context-accessing-1-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |4|500|500|29796|496.6|0.0|0|6|52|0|0|0|29796|100%|
> |4|650|650|38706|645.0|0.0|0|7|149|0|0|0|38706|100%|
> |4|800|800|47585|793.0|0.0|0|8|129|0|0|0|47585|100%|
> |4|950|950|54467|907.7|0.0|0|43|377|0|0|0|54467|100%|
> |4|1100|1100|62500|1,041.6|0.0|0|54|396|0|0|0|62500|100%|
> |4|1250|1250|69446|1,157.3|0.0|0|81|512|0|0|0|69446|100%|
> |4|1400|1400|76217|1,270.2|0.0|0|97|517|0|0|0|76217|100%|
> |4|1550|1550|80216|1,336.8|0.0|0|152|810|0|0|0|80216|100%|
> |4|1700|1700|80797|1,346.5|0.0|0|271|864|0|0|0|80797|100%|
> |4|1850|1850|94172|1,569.3|0.0|0|182|822|0|0|0|94172|100%|
> |4|2000|1916|91014|1,516.8|0.0|0|253|48650|0|0|0|91014|100%|
> |4|2150|1916|95852|1,597.4|0.0|0|205|848|83|83|0|95769|99%|
> h3. 4 workers, 1 context
> !4-workers-1-context-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |4|500|500|29922|498.7|0.0|0|2|39|0|0|0|29922|100%|
> |4|650|650|38923|648.7|0.0|0|1|39|0|0|0|38923|100%|
> |4|800|800|47916|798.5|0.0|0|1|17|0|0|0|47916|100%|
> |4|950|950|56896|948.2|0.0|0|1|17|0|0|0|56896|100%|
> |4|1100|1100|65889|1,098.1|0.0|0|1|115|0|0|0|65889|100%|
> |4|1250|1250|74874|1,247.8|0.0|0|1|101|0|0|0|74874|100%|
> |4|1400|1400|83818|1,396.8|0.0|0|1|17|0|0|0|83818|100%|
> |4|1550|1550|92830|1,547.0|0.0|0|1|17|0|0|0|92830|100%|
> |4|1700|1700|101805|1,696.6|0.0|0|1|11|0|0|0|101805|100%|
> |4|1850|1850|110785|1,846.3|0.0|0|1|11|0|0|0|110785|100%|
> |4|2000|1916|113747|1,895.6|0.0|0|10|53108|0|0|0|113747|100%|
> |4|2150|1916|114825|1,913.6|0.0|0|1|24|83|83|0|114742|99%|
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[JBoss JIRA] (MODCLUSTER-372) Number of registered contexts negatively affects mod_cluster performance
by Michal Babacek (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-372?page=com.atlassian.jira.pl... ]
Michal Babacek updated MODCLUSTER-372:
--------------------------------------
Description:
There is a performance concern regarding CPU usage on the Apache HTTP Server with mod_cluster set up as a load balancer. Perf tests revealed that the major variable affecting the CPU usage is the overall number of registered contexts. It's noteworthy that these contexts actually don't need to be accessed at all, it's enough that they are present.
Stay tuned for some profiler outputs...
The first test [9 workers, 31 contexts, round robin|https://issues.jboss.org/browse/MODCLUSTER-372#9workers%2C31context...] depicts a behavior where all contexts are being accessed in a round robin fashion. Note the CPU usage. If we compare it to the [9 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372#9workers%2C1context] test, it becomes apparent that there is something wrong with the CPU usage. As it is clear from the [9 workers, 31 contexts, access 1|https://issues.jboss.org/browse/MODCLUSTER-372#9workers%2C31contexts%2C...] test, accessing only one of these contexts doesn't help much.
The last two tests, [4 workers, 61 contexts, accessing 1|https://issues.jboss.org/browse/MODCLUSTER-372#4workers%2C61contexts%2C...] and [4 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372#4workers%2C1context] confirm the results, environment differs only in number of nodes and number of contexts.
h3. 9 workers, 31 contexts, round robin
!9-workers-31-context-round-robin-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8843|147.4|15|60|0|8843|100%|
|9|250|250|14422|240.3|37|215|0|14422|100%|
|9|350|350|17551|292.5|196|443|0|17551|100%|
|9|450|450|21303|355.0|269|603|0|21303|100%|
|9|550|550|24818|413.6|325|686|0|24818|100%|
|9|650|650|26804|446.7|469|800|0|26804|100%|
|9|750|750|29930|498.8|507|985|0|29930|100%|
|9|850|850|30665|511.0|665|1185|0|30665|100%|
|9|950|950|34421|573.6|647|1316|0|34421|100%|
|9|1050|1050|35067|584.4|800|1487|0|35067|100%|
|9|1150|1150|36024|600.4|925|1612|0|36024|100%|
|9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
|9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
|9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
|9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
|9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
|9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
|9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
|9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
|9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
|9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
|9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
h3. 9 workers, 31 contexts, accessing only one of them
!9-workers-31-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8954|149.2|4|42|0|8954|100%|
|9|250|250|14897|248.3|7|33|0|14897|100%|
|9|350|350|20784|346.4|8|68|0|20784|100%|
|9|450|450|26748|445.8|8|69|0|26748|100%|
|9|550|550|32553|542.5|11|92|0|32553|100%|
|9|650|650|38558|642.6|10|60|0|38558|100%|
|9|750|750|43571|726.1|29|329|0|43571|100%|
|9|850|850|46133|768.8|99|494|0|46133|100%|
|9|950|950|50854|847.5|120|501|0|50854|100%|
|9|1050|1050|54451|907.4|154|584|0|54451|100%|
|9|1150|1150|59961|999.3|138|674|0|59961|100%|
|9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
|9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
|9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
|9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
|9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
|9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
|9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
|9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
|9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
|9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
|9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
h3. 9 workers, 1 context
!9-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8965|149.4|2|12|0|8965|100%|
|9|250|250|14965|249.4|2|22|0|14965|100%|
|9|350|350|20950|349.1|2|23|0|20950|100%|
|9|450|450|26941|449.0|2|26|0|26941|100%|
|9|550|550|32937|548.9|1|26|0|32937|100%|
|9|650|650|38900|648.3|1|19|0|38900|100%|
|9|750|750|44918|748.6|1|11|0|44918|100%|
|9|850|850|50902|848.3|2|22|0|50902|100%|
|9|950|950|56878|947.9|1|14|0|56878|100%|
|9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
|9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
|9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
|9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
|9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
|9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
|9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
|9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
|9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
|9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
|9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
|9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
|9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
h3. 4 workers, 61 contexts, accessing only one of them
!4-workers-61-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29796|496.6|0.0|0|6|52|0|0|0|29796|100%|
|4|650|650|38706|645.0|0.0|0|7|149|0|0|0|38706|100%|
|4|800|800|47585|793.0|0.0|0|8|129|0|0|0|47585|100%|
|4|950|950|54467|907.7|0.0|0|43|377|0|0|0|54467|100%|
|4|1100|1100|62500|1,041.6|0.0|0|54|396|0|0|0|62500|100%|
|4|1250|1250|69446|1,157.3|0.0|0|81|512|0|0|0|69446|100%|
|4|1400|1400|76217|1,270.2|0.0|0|97|517|0|0|0|76217|100%|
|4|1550|1550|80216|1,336.8|0.0|0|152|810|0|0|0|80216|100%|
|4|1700|1700|80797|1,346.5|0.0|0|271|864|0|0|0|80797|100%|
|4|1850|1850|94172|1,569.3|0.0|0|182|822|0|0|0|94172|100%|
|4|2000|1916|91014|1,516.8|0.0|0|253|48650|0|0|0|91014|100%|
|4|2150|1916|95852|1,597.4|0.0|0|205|848|83|83|0|95769|99%|
h3. 4 workers, 1 context
!4-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29922|498.7|0.0|0|2|39|0|0|0|29922|100%|
|4|650|650|38923|648.7|0.0|0|1|39|0|0|0|38923|100%|
|4|800|800|47916|798.5|0.0|0|1|17|0|0|0|47916|100%|
|4|950|950|56896|948.2|0.0|0|1|17|0|0|0|56896|100%|
|4|1100|1100|65889|1,098.1|0.0|0|1|115|0|0|0|65889|100%|
|4|1250|1250|74874|1,247.8|0.0|0|1|101|0|0|0|74874|100%|
|4|1400|1400|83818|1,396.8|0.0|0|1|17|0|0|0|83818|100%|
|4|1550|1550|92830|1,547.0|0.0|0|1|17|0|0|0|92830|100%|
|4|1700|1700|101805|1,696.6|0.0|0|1|11|0|0|0|101805|100%|
|4|1850|1850|110785|1,846.3|0.0|0|1|11|0|0|0|110785|100%|
|4|2000|1916|113747|1,895.6|0.0|0|10|53108|0|0|0|113747|100%|
|4|2150|1916|114825|1,913.6|0.0|0|1|24|83|83|0|114742|99%|
was:
There is a performance concern regarding CPU usage on the Apache HTTP Server with mod_cluster set up as a load balancer. Perf tests revealed that the major variable affecting the CPU usage is the overall number of registered contexts. It's noteworthy that these contexts actually don't need to be accessed at all, it's enough that they are present.
Stay tuned for some profiler outputs...
The first test [9 workers, 31 contexts, round robin|https://issues.jboss.org/browse/MODCLUSTER-372#9workers%2C31context...] depicts a behavior where all contexts are being accessed in a round robin fashion. Note the CPU usage. If we compare it to the [9 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372
#9workers%2C1context] test, it becomes apparent that there is something wrong with the CPU usage. As it is clear from the [9 workers, 31 contexts, access 1|https://issues.jboss.org/browse/MODCLUSTER-372
#9workers%2C31contexts%2Caccessingonlyoneofthem] test, accessing only one of these contexts doesn't help much.
The last two tests, [4 workers, 61 contexts, accessing 1|https://issues.jboss.org/browse/MODCLUSTER-372#4workers%2C61contexts%2C...
] and [4 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372
#4workers%2C1context] confirm the results, environment differs only in number of nodes and number of contexts.
h3. 9 workers, 31 contexts, round robin
!9-workers-31-context-round-robin-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8843|147.4|15|60|0|8843|100%|
|9|250|250|14422|240.3|37|215|0|14422|100%|
|9|350|350|17551|292.5|196|443|0|17551|100%|
|9|450|450|21303|355.0|269|603|0|21303|100%|
|9|550|550|24818|413.6|325|686|0|24818|100%|
|9|650|650|26804|446.7|469|800|0|26804|100%|
|9|750|750|29930|498.8|507|985|0|29930|100%|
|9|850|850|30665|511.0|665|1185|0|30665|100%|
|9|950|950|34421|573.6|647|1316|0|34421|100%|
|9|1050|1050|35067|584.4|800|1487|0|35067|100%|
|9|1150|1150|36024|600.4|925|1612|0|36024|100%|
|9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
|9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
|9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
|9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
|9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
|9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
|9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
|9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
|9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
|9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
|9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
h3. 9 workers, 31 contexts, accessing only one of them
!9-workers-31-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8954|149.2|4|42|0|8954|100%|
|9|250|250|14897|248.3|7|33|0|14897|100%|
|9|350|350|20784|346.4|8|68|0|20784|100%|
|9|450|450|26748|445.8|8|69|0|26748|100%|
|9|550|550|32553|542.5|11|92|0|32553|100%|
|9|650|650|38558|642.6|10|60|0|38558|100%|
|9|750|750|43571|726.1|29|329|0|43571|100%|
|9|850|850|46133|768.8|99|494|0|46133|100%|
|9|950|950|50854|847.5|120|501|0|50854|100%|
|9|1050|1050|54451|907.4|154|584|0|54451|100%|
|9|1150|1150|59961|999.3|138|674|0|59961|100%|
|9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
|9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
|9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
|9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
|9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
|9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
|9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
|9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
|9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
|9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
|9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
h3. 9 workers, 1 context
!9-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8965|149.4|2|12|0|8965|100%|
|9|250|250|14965|249.4|2|22|0|14965|100%|
|9|350|350|20950|349.1|2|23|0|20950|100%|
|9|450|450|26941|449.0|2|26|0|26941|100%|
|9|550|550|32937|548.9|1|26|0|32937|100%|
|9|650|650|38900|648.3|1|19|0|38900|100%|
|9|750|750|44918|748.6|1|11|0|44918|100%|
|9|850|850|50902|848.3|2|22|0|50902|100%|
|9|950|950|56878|947.9|1|14|0|56878|100%|
|9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
|9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
|9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
|9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
|9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
|9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
|9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
|9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
|9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
|9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
|9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
|9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
|9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
h3. 4 workers, 61 contexts, accessing only one of them
!4-workers-61-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29796|496.6|0.0|0|6|52|0|0|0|29796|100%|
|4|650|650|38706|645.0|0.0|0|7|149|0|0|0|38706|100%|
|4|800|800|47585|793.0|0.0|0|8|129|0|0|0|47585|100%|
|4|950|950|54467|907.7|0.0|0|43|377|0|0|0|54467|100%|
|4|1100|1100|62500|1,041.6|0.0|0|54|396|0|0|0|62500|100%|
|4|1250|1250|69446|1,157.3|0.0|0|81|512|0|0|0|69446|100%|
|4|1400|1400|76217|1,270.2|0.0|0|97|517|0|0|0|76217|100%|
|4|1550|1550|80216|1,336.8|0.0|0|152|810|0|0|0|80216|100%|
|4|1700|1700|80797|1,346.5|0.0|0|271|864|0|0|0|80797|100%|
|4|1850|1850|94172|1,569.3|0.0|0|182|822|0|0|0|94172|100%|
|4|2000|1916|91014|1,516.8|0.0|0|253|48650|0|0|0|91014|100%|
|4|2150|1916|95852|1,597.4|0.0|0|205|848|83|83|0|95769|99%|
h3. 4 workers, 1 context
!4-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29922|498.7|0.0|0|2|39|0|0|0|29922|100%|
|4|650|650|38923|648.7|0.0|0|1|39|0|0|0|38923|100%|
|4|800|800|47916|798.5|0.0|0|1|17|0|0|0|47916|100%|
|4|950|950|56896|948.2|0.0|0|1|17|0|0|0|56896|100%|
|4|1100|1100|65889|1,098.1|0.0|0|1|115|0|0|0|65889|100%|
|4|1250|1250|74874|1,247.8|0.0|0|1|101|0|0|0|74874|100%|
|4|1400|1400|83818|1,396.8|0.0|0|1|17|0|0|0|83818|100%|
|4|1550|1550|92830|1,547.0|0.0|0|1|17|0|0|0|92830|100%|
|4|1700|1700|101805|1,696.6|0.0|0|1|11|0|0|0|101805|100%|
|4|1850|1850|110785|1,846.3|0.0|0|1|11|0|0|0|110785|100%|
|4|2000|1916|113747|1,895.6|0.0|0|10|53108|0|0|0|113747|100%|
|4|2150|1916|114825|1,913.6|0.0|0|1|24|83|83|0|114742|99%|
> Number of registered contexts negatively affects mod_cluster performance
> ------------------------------------------------------------------------
>
> Key: MODCLUSTER-372
> URL: https://issues.jboss.org/browse/MODCLUSTER-372
> Project: mod_cluster
> Issue Type: Bug
> Affects Versions: 1.2.4.Final, 1.2.6.Final
> Environment: RHEL6, other platforms are to be confirmed.
> Reporter: Michal Babacek
> Assignee: Michal Babacek
> Labels: mod_cluster, performace
> Fix For: 1.2.7.Final, 1.3.0.Alpha2
>
> Attachments: 4-workers-1-context-balancer-cpu.png, 4-workers-61-context-accessing-1-balancer-cpu.png, 9-workers-1-context-balancer-cpu.png, 9-workers-31-context-accessing-1-balancer-cpu.png, 9-workers-31-context-round-robin-balancer-cpu.png
>
>
> There is a performance concern regarding CPU usage on the Apache HTTP Server with mod_cluster set up as a load balancer. Perf tests revealed that the major variable affecting the CPU usage is the overall number of registered contexts. It's noteworthy that these contexts actually don't need to be accessed at all, it's enough that they are present.
> Stay tuned for some profiler outputs...
> The first test [9 workers, 31 contexts, round robin|https://issues.jboss.org/browse/MODCLUSTER-372#9workers%2C31context...] depicts a behavior where all contexts are being accessed in a round robin fashion. Note the CPU usage. If we compare it to the [9 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372#9workers%2C1context] test, it becomes apparent that there is something wrong with the CPU usage. As it is clear from the [9 workers, 31 contexts, access 1|https://issues.jboss.org/browse/MODCLUSTER-372#9workers%2C31contexts%2C...] test, accessing only one of these contexts doesn't help much.
> The last two tests, [4 workers, 61 contexts, accessing 1|https://issues.jboss.org/browse/MODCLUSTER-372#4workers%2C61contexts%2C...] and [4 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372#4workers%2C1context] confirm the results, environment differs only in number of nodes and number of contexts.
> h3. 9 workers, 31 contexts, round robin
> !9-workers-31-context-round-robin-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8843|147.4|15|60|0|8843|100%|
> |9|250|250|14422|240.3|37|215|0|14422|100%|
> |9|350|350|17551|292.5|196|443|0|17551|100%|
> |9|450|450|21303|355.0|269|603|0|21303|100%|
> |9|550|550|24818|413.6|325|686|0|24818|100%|
> |9|650|650|26804|446.7|469|800|0|26804|100%|
> |9|750|750|29930|498.8|507|985|0|29930|100%|
> |9|850|850|30665|511.0|665|1185|0|30665|100%|
> |9|950|950|34421|573.6|647|1316|0|34421|100%|
> |9|1050|1050|35067|584.4|800|1487|0|35067|100%|
> |9|1150|1150|36024|600.4|925|1612|0|36024|100%|
> |9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
> |9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
> |9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
> |9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
> |9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
> |9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
> |9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
> |9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
> |9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
> |9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
> |9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
> h3. 9 workers, 31 contexts, accessing only one of them
> !9-workers-31-context-accessing-1-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8954|149.2|4|42|0|8954|100%|
> |9|250|250|14897|248.3|7|33|0|14897|100%|
> |9|350|350|20784|346.4|8|68|0|20784|100%|
> |9|450|450|26748|445.8|8|69|0|26748|100%|
> |9|550|550|32553|542.5|11|92|0|32553|100%|
> |9|650|650|38558|642.6|10|60|0|38558|100%|
> |9|750|750|43571|726.1|29|329|0|43571|100%|
> |9|850|850|46133|768.8|99|494|0|46133|100%|
> |9|950|950|50854|847.5|120|501|0|50854|100%|
> |9|1050|1050|54451|907.4|154|584|0|54451|100%|
> |9|1150|1150|59961|999.3|138|674|0|59961|100%|
> |9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
> |9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
> |9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
> |9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
> |9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
> |9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
> |9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
> |9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
> |9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
> |9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
> |9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
> h3. 9 workers, 1 context
> !9-workers-1-context-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8965|149.4|2|12|0|8965|100%|
> |9|250|250|14965|249.4|2|22|0|14965|100%|
> |9|350|350|20950|349.1|2|23|0|20950|100%|
> |9|450|450|26941|449.0|2|26|0|26941|100%|
> |9|550|550|32937|548.9|1|26|0|32937|100%|
> |9|650|650|38900|648.3|1|19|0|38900|100%|
> |9|750|750|44918|748.6|1|11|0|44918|100%|
> |9|850|850|50902|848.3|2|22|0|50902|100%|
> |9|950|950|56878|947.9|1|14|0|56878|100%|
> |9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
> |9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
> |9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
> |9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
> |9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
> |9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
> |9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
> |9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
> |9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
> |9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
> |9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
> |9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
> |9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
> h3. 4 workers, 61 contexts, accessing only one of them
> !4-workers-61-context-accessing-1-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |4|500|500|29796|496.6|0.0|0|6|52|0|0|0|29796|100%|
> |4|650|650|38706|645.0|0.0|0|7|149|0|0|0|38706|100%|
> |4|800|800|47585|793.0|0.0|0|8|129|0|0|0|47585|100%|
> |4|950|950|54467|907.7|0.0|0|43|377|0|0|0|54467|100%|
> |4|1100|1100|62500|1,041.6|0.0|0|54|396|0|0|0|62500|100%|
> |4|1250|1250|69446|1,157.3|0.0|0|81|512|0|0|0|69446|100%|
> |4|1400|1400|76217|1,270.2|0.0|0|97|517|0|0|0|76217|100%|
> |4|1550|1550|80216|1,336.8|0.0|0|152|810|0|0|0|80216|100%|
> |4|1700|1700|80797|1,346.5|0.0|0|271|864|0|0|0|80797|100%|
> |4|1850|1850|94172|1,569.3|0.0|0|182|822|0|0|0|94172|100%|
> |4|2000|1916|91014|1,516.8|0.0|0|253|48650|0|0|0|91014|100%|
> |4|2150|1916|95852|1,597.4|0.0|0|205|848|83|83|0|95769|99%|
> h3. 4 workers, 1 context
> !4-workers-1-context-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |4|500|500|29922|498.7|0.0|0|2|39|0|0|0|29922|100%|
> |4|650|650|38923|648.7|0.0|0|1|39|0|0|0|38923|100%|
> |4|800|800|47916|798.5|0.0|0|1|17|0|0|0|47916|100%|
> |4|950|950|56896|948.2|0.0|0|1|17|0|0|0|56896|100%|
> |4|1100|1100|65889|1,098.1|0.0|0|1|115|0|0|0|65889|100%|
> |4|1250|1250|74874|1,247.8|0.0|0|1|101|0|0|0|74874|100%|
> |4|1400|1400|83818|1,396.8|0.0|0|1|17|0|0|0|83818|100%|
> |4|1550|1550|92830|1,547.0|0.0|0|1|17|0|0|0|92830|100%|
> |4|1700|1700|101805|1,696.6|0.0|0|1|11|0|0|0|101805|100%|
> |4|1850|1850|110785|1,846.3|0.0|0|1|11|0|0|0|110785|100%|
> |4|2000|1916|113747|1,895.6|0.0|0|10|53108|0|0|0|113747|100%|
> |4|2150|1916|114825|1,913.6|0.0|0|1|24|83|83|0|114742|99%|
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[JBoss JIRA] (MODCLUSTER-372) Number of registered contexts negatively affects mod_cluster performance
by Michal Babacek (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-372?page=com.atlassian.jira.pl... ]
Michal Babacek updated MODCLUSTER-372:
--------------------------------------
Description:
There is a performance concern regarding CPU usage on the Apache HTTP Server with mod_cluster set up as a load balancer. Perf tests revealed that the major variable affecting the CPU usage is the overall number of registered contexts. It's noteworthy that these contexts actually don't need to be accessed at all, it's enough that they are present.
Stay tuned for some profiler outputs...
The first test [9 workers, 31 contexts, round robin|https://issues.jboss.org/browse/MODCLUSTER-372#9workers%2C31context...] depicts a behavior where all contexts are being accessed in a round robin fashion. Note the CPU usage. If we compare it to the [9 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372
#9workers%2C1context] test, it becomes apparent that there is something wrong with the CPU usage. As it is clear from the [9 workers, 31 contexts, access 1|https://issues.jboss.org/browse/MODCLUSTER-372
#9workers%2C31contexts%2Caccessingonlyoneofthem] test, accessing only one of these contexts doesn't help much.
The last two tests, [4 workers, 61 contexts, accessing 1|https://issues.jboss.org/browse/MODCLUSTER-372#4workers%2C61contexts%2C...
] and [4 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372
#4workers%2C1context] confirm the results, environment differs only in number of nodes and number of contexts.
h3. 9 workers, 31 contexts, round robin
!9-workers-31-context-round-robin-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8843|147.4|15|60|0|8843|100%|
|9|250|250|14422|240.3|37|215|0|14422|100%|
|9|350|350|17551|292.5|196|443|0|17551|100%|
|9|450|450|21303|355.0|269|603|0|21303|100%|
|9|550|550|24818|413.6|325|686|0|24818|100%|
|9|650|650|26804|446.7|469|800|0|26804|100%|
|9|750|750|29930|498.8|507|985|0|29930|100%|
|9|850|850|30665|511.0|665|1185|0|30665|100%|
|9|950|950|34421|573.6|647|1316|0|34421|100%|
|9|1050|1050|35067|584.4|800|1487|0|35067|100%|
|9|1150|1150|36024|600.4|925|1612|0|36024|100%|
|9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
|9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
|9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
|9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
|9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
|9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
|9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
|9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
|9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
|9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
|9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
h3. 9 workers, 31 contexts, accessing only one of them
!9-workers-31-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8954|149.2|4|42|0|8954|100%|
|9|250|250|14897|248.3|7|33|0|14897|100%|
|9|350|350|20784|346.4|8|68|0|20784|100%|
|9|450|450|26748|445.8|8|69|0|26748|100%|
|9|550|550|32553|542.5|11|92|0|32553|100%|
|9|650|650|38558|642.6|10|60|0|38558|100%|
|9|750|750|43571|726.1|29|329|0|43571|100%|
|9|850|850|46133|768.8|99|494|0|46133|100%|
|9|950|950|50854|847.5|120|501|0|50854|100%|
|9|1050|1050|54451|907.4|154|584|0|54451|100%|
|9|1150|1150|59961|999.3|138|674|0|59961|100%|
|9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
|9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
|9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
|9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
|9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
|9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
|9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
|9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
|9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
|9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
|9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
h3. 9 workers, 1 context
!9-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8965|149.4|2|12|0|8965|100%|
|9|250|250|14965|249.4|2|22|0|14965|100%|
|9|350|350|20950|349.1|2|23|0|20950|100%|
|9|450|450|26941|449.0|2|26|0|26941|100%|
|9|550|550|32937|548.9|1|26|0|32937|100%|
|9|650|650|38900|648.3|1|19|0|38900|100%|
|9|750|750|44918|748.6|1|11|0|44918|100%|
|9|850|850|50902|848.3|2|22|0|50902|100%|
|9|950|950|56878|947.9|1|14|0|56878|100%|
|9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
|9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
|9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
|9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
|9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
|9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
|9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
|9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
|9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
|9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
|9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
|9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
|9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
h3. 4 workers, 61 contexts, accessing only one of them
!4-workers-61-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29796|496.6|0.0|0|6|52|0|0|0|29796|100%|
|4|650|650|38706|645.0|0.0|0|7|149|0|0|0|38706|100%|
|4|800|800|47585|793.0|0.0|0|8|129|0|0|0|47585|100%|
|4|950|950|54467|907.7|0.0|0|43|377|0|0|0|54467|100%|
|4|1100|1100|62500|1,041.6|0.0|0|54|396|0|0|0|62500|100%|
|4|1250|1250|69446|1,157.3|0.0|0|81|512|0|0|0|69446|100%|
|4|1400|1400|76217|1,270.2|0.0|0|97|517|0|0|0|76217|100%|
|4|1550|1550|80216|1,336.8|0.0|0|152|810|0|0|0|80216|100%|
|4|1700|1700|80797|1,346.5|0.0|0|271|864|0|0|0|80797|100%|
|4|1850|1850|94172|1,569.3|0.0|0|182|822|0|0|0|94172|100%|
|4|2000|1916|91014|1,516.8|0.0|0|253|48650|0|0|0|91014|100%|
|4|2150|1916|95852|1,597.4|0.0|0|205|848|83|83|0|95769|99%|
h3. 4 workers, 1 context
!4-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29922|498.7|0.0|0|2|39|0|0|0|29922|100%|
|4|650|650|38923|648.7|0.0|0|1|39|0|0|0|38923|100%|
|4|800|800|47916|798.5|0.0|0|1|17|0|0|0|47916|100%|
|4|950|950|56896|948.2|0.0|0|1|17|0|0|0|56896|100%|
|4|1100|1100|65889|1,098.1|0.0|0|1|115|0|0|0|65889|100%|
|4|1250|1250|74874|1,247.8|0.0|0|1|101|0|0|0|74874|100%|
|4|1400|1400|83818|1,396.8|0.0|0|1|17|0|0|0|83818|100%|
|4|1550|1550|92830|1,547.0|0.0|0|1|17|0|0|0|92830|100%|
|4|1700|1700|101805|1,696.6|0.0|0|1|11|0|0|0|101805|100%|
|4|1850|1850|110785|1,846.3|0.0|0|1|11|0|0|0|110785|100%|
|4|2000|1916|113747|1,895.6|0.0|0|10|53108|0|0|0|113747|100%|
|4|2150|1916|114825|1,913.6|0.0|0|1|24|83|83|0|114742|99%|
was:
There is a performance concern regarding CPU usage on the Apache HTTP Server with
mod_cluster set up as a load balancer.
Perf tests revealed that the major variable affecting the CPU usage is the overall number of registered contexts.
It's noteworthy that these contexts actually don't need to be accessed at all, it's enough that they are present.
Stay tuned for some profiler outputs...
The first test [9 workers, 31 contexts, round robin|https://issues.jboss.org/browse/MODCLUSTER-372#9workers%2C31context...]
depicts a behavior where all contexts are being accessed in a round robin fashion. Note the CPU usage. If we compare it to the [9 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372
#9workers%2C1context] test, it becomes apparent that there is something wrong with the CPU usage. As it is clear from the [9 workers, 31 contexts, access 1|https://issues.jboss.org/browse/MODCLUSTER-372
#9workers%2C31contexts%2Caccessingonlyoneofthem] test, accessing only one of these contexts doesn't help much.
The last two tests, [4 workers, 61 contexts, accessing 1|https://issues.jboss.org/browse/MODCLUSTER-372#4workers%2C61contexts%2C...
] and [4 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372
#4workers%2C1context] confirm the results, environment differs only in number of nodes and number of contexts.
h3. 9 workers, 31 contexts, round robin
!9-workers-31-context-round-robin-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8843|147.4|15|60|0|8843|100%|
|9|250|250|14422|240.3|37|215|0|14422|100%|
|9|350|350|17551|292.5|196|443|0|17551|100%|
|9|450|450|21303|355.0|269|603|0|21303|100%|
|9|550|550|24818|413.6|325|686|0|24818|100%|
|9|650|650|26804|446.7|469|800|0|26804|100%|
|9|750|750|29930|498.8|507|985|0|29930|100%|
|9|850|850|30665|511.0|665|1185|0|30665|100%|
|9|950|950|34421|573.6|647|1316|0|34421|100%|
|9|1050|1050|35067|584.4|800|1487|0|35067|100%|
|9|1150|1150|36024|600.4|925|1612|0|36024|100%|
|9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
|9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
|9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
|9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
|9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
|9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
|9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
|9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
|9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
|9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
|9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
h3. 9 workers, 31 contexts, accessing only one of them
!9-workers-31-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8954|149.2|4|42|0|8954|100%|
|9|250|250|14897|248.3|7|33|0|14897|100%|
|9|350|350|20784|346.4|8|68|0|20784|100%|
|9|450|450|26748|445.8|8|69|0|26748|100%|
|9|550|550|32553|542.5|11|92|0|32553|100%|
|9|650|650|38558|642.6|10|60|0|38558|100%|
|9|750|750|43571|726.1|29|329|0|43571|100%|
|9|850|850|46133|768.8|99|494|0|46133|100%|
|9|950|950|50854|847.5|120|501|0|50854|100%|
|9|1050|1050|54451|907.4|154|584|0|54451|100%|
|9|1150|1150|59961|999.3|138|674|0|59961|100%|
|9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
|9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
|9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
|9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
|9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
|9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
|9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
|9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
|9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
|9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
|9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
h3. 9 workers, 1 context
!9-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8965|149.4|2|12|0|8965|100%|
|9|250|250|14965|249.4|2|22|0|14965|100%|
|9|350|350|20950|349.1|2|23|0|20950|100%|
|9|450|450|26941|449.0|2|26|0|26941|100%|
|9|550|550|32937|548.9|1|26|0|32937|100%|
|9|650|650|38900|648.3|1|19|0|38900|100%|
|9|750|750|44918|748.6|1|11|0|44918|100%|
|9|850|850|50902|848.3|2|22|0|50902|100%|
|9|950|950|56878|947.9|1|14|0|56878|100%|
|9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
|9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
|9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
|9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
|9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
|9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
|9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
|9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
|9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
|9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
|9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
|9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
|9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
h3. 4 workers, 61 contexts, accessing only one of them
!4-workers-61-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29796|496.6|0.0|0|6|52|0|0|0|29796|100%|
|4|650|650|38706|645.0|0.0|0|7|149|0|0|0|38706|100%|
|4|800|800|47585|793.0|0.0|0|8|129|0|0|0|47585|100%|
|4|950|950|54467|907.7|0.0|0|43|377|0|0|0|54467|100%|
|4|1100|1100|62500|1,041.6|0.0|0|54|396|0|0|0|62500|100%|
|4|1250|1250|69446|1,157.3|0.0|0|81|512|0|0|0|69446|100%|
|4|1400|1400|76217|1,270.2|0.0|0|97|517|0|0|0|76217|100%|
|4|1550|1550|80216|1,336.8|0.0|0|152|810|0|0|0|80216|100%|
|4|1700|1700|80797|1,346.5|0.0|0|271|864|0|0|0|80797|100%|
|4|1850|1850|94172|1,569.3|0.0|0|182|822|0|0|0|94172|100%|
|4|2000|1916|91014|1,516.8|0.0|0|253|48650|0|0|0|91014|100%|
|4|2150|1916|95852|1,597.4|0.0|0|205|848|83|83|0|95769|99%|
h3. 4 workers, 1 context
!4-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29922|498.7|0.0|0|2|39|0|0|0|29922|100%|
|4|650|650|38923|648.7|0.0|0|1|39|0|0|0|38923|100%|
|4|800|800|47916|798.5|0.0|0|1|17|0|0|0|47916|100%|
|4|950|950|56896|948.2|0.0|0|1|17|0|0|0|56896|100%|
|4|1100|1100|65889|1,098.1|0.0|0|1|115|0|0|0|65889|100%|
|4|1250|1250|74874|1,247.8|0.0|0|1|101|0|0|0|74874|100%|
|4|1400|1400|83818|1,396.8|0.0|0|1|17|0|0|0|83818|100%|
|4|1550|1550|92830|1,547.0|0.0|0|1|17|0|0|0|92830|100%|
|4|1700|1700|101805|1,696.6|0.0|0|1|11|0|0|0|101805|100%|
|4|1850|1850|110785|1,846.3|0.0|0|1|11|0|0|0|110785|100%|
|4|2000|1916|113747|1,895.6|0.0|0|10|53108|0|0|0|113747|100%|
|4|2150|1916|114825|1,913.6|0.0|0|1|24|83|83|0|114742|99%|
> Number of registered contexts negatively affects mod_cluster performance
> ------------------------------------------------------------------------
>
> Key: MODCLUSTER-372
> URL: https://issues.jboss.org/browse/MODCLUSTER-372
> Project: mod_cluster
> Issue Type: Bug
> Affects Versions: 1.2.4.Final, 1.2.6.Final
> Environment: RHEL6, other platforms are to be confirmed.
> Reporter: Michal Babacek
> Assignee: Michal Babacek
> Labels: mod_cluster, performace
> Fix For: 1.2.7.Final, 1.3.0.Alpha2
>
> Attachments: 4-workers-1-context-balancer-cpu.png, 4-workers-61-context-accessing-1-balancer-cpu.png, 9-workers-1-context-balancer-cpu.png, 9-workers-31-context-accessing-1-balancer-cpu.png, 9-workers-31-context-round-robin-balancer-cpu.png
>
>
> There is a performance concern regarding CPU usage on the Apache HTTP Server with mod_cluster set up as a load balancer. Perf tests revealed that the major variable affecting the CPU usage is the overall number of registered contexts. It's noteworthy that these contexts actually don't need to be accessed at all, it's enough that they are present.
> Stay tuned for some profiler outputs...
> The first test [9 workers, 31 contexts, round robin|https://issues.jboss.org/browse/MODCLUSTER-372#9workers%2C31context...] depicts a behavior where all contexts are being accessed in a round robin fashion. Note the CPU usage. If we compare it to the [9 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372
> #9workers%2C1context] test, it becomes apparent that there is something wrong with the CPU usage. As it is clear from the [9 workers, 31 contexts, access 1|https://issues.jboss.org/browse/MODCLUSTER-372
> #9workers%2C31contexts%2Caccessingonlyoneofthem] test, accessing only one of these contexts doesn't help much.
> The last two tests, [4 workers, 61 contexts, accessing 1|https://issues.jboss.org/browse/MODCLUSTER-372#4workers%2C61contexts%2C...
> ] and [4 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372
> #4workers%2C1context] confirm the results, environment differs only in number of nodes and number of contexts.
> h3. 9 workers, 31 contexts, round robin
> !9-workers-31-context-round-robin-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8843|147.4|15|60|0|8843|100%|
> |9|250|250|14422|240.3|37|215|0|14422|100%|
> |9|350|350|17551|292.5|196|443|0|17551|100%|
> |9|450|450|21303|355.0|269|603|0|21303|100%|
> |9|550|550|24818|413.6|325|686|0|24818|100%|
> |9|650|650|26804|446.7|469|800|0|26804|100%|
> |9|750|750|29930|498.8|507|985|0|29930|100%|
> |9|850|850|30665|511.0|665|1185|0|30665|100%|
> |9|950|950|34421|573.6|647|1316|0|34421|100%|
> |9|1050|1050|35067|584.4|800|1487|0|35067|100%|
> |9|1150|1150|36024|600.4|925|1612|0|36024|100%|
> |9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
> |9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
> |9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
> |9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
> |9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
> |9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
> |9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
> |9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
> |9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
> |9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
> |9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
> h3. 9 workers, 31 contexts, accessing only one of them
> !9-workers-31-context-accessing-1-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8954|149.2|4|42|0|8954|100%|
> |9|250|250|14897|248.3|7|33|0|14897|100%|
> |9|350|350|20784|346.4|8|68|0|20784|100%|
> |9|450|450|26748|445.8|8|69|0|26748|100%|
> |9|550|550|32553|542.5|11|92|0|32553|100%|
> |9|650|650|38558|642.6|10|60|0|38558|100%|
> |9|750|750|43571|726.1|29|329|0|43571|100%|
> |9|850|850|46133|768.8|99|494|0|46133|100%|
> |9|950|950|50854|847.5|120|501|0|50854|100%|
> |9|1050|1050|54451|907.4|154|584|0|54451|100%|
> |9|1150|1150|59961|999.3|138|674|0|59961|100%|
> |9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
> |9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
> |9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
> |9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
> |9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
> |9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
> |9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
> |9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
> |9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
> |9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
> |9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
> h3. 9 workers, 1 context
> !9-workers-1-context-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8965|149.4|2|12|0|8965|100%|
> |9|250|250|14965|249.4|2|22|0|14965|100%|
> |9|350|350|20950|349.1|2|23|0|20950|100%|
> |9|450|450|26941|449.0|2|26|0|26941|100%|
> |9|550|550|32937|548.9|1|26|0|32937|100%|
> |9|650|650|38900|648.3|1|19|0|38900|100%|
> |9|750|750|44918|748.6|1|11|0|44918|100%|
> |9|850|850|50902|848.3|2|22|0|50902|100%|
> |9|950|950|56878|947.9|1|14|0|56878|100%|
> |9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
> |9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
> |9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
> |9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
> |9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
> |9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
> |9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
> |9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
> |9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
> |9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
> |9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
> |9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
> |9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
> h3. 4 workers, 61 contexts, accessing only one of them
> !4-workers-61-context-accessing-1-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |4|500|500|29796|496.6|0.0|0|6|52|0|0|0|29796|100%|
> |4|650|650|38706|645.0|0.0|0|7|149|0|0|0|38706|100%|
> |4|800|800|47585|793.0|0.0|0|8|129|0|0|0|47585|100%|
> |4|950|950|54467|907.7|0.0|0|43|377|0|0|0|54467|100%|
> |4|1100|1100|62500|1,041.6|0.0|0|54|396|0|0|0|62500|100%|
> |4|1250|1250|69446|1,157.3|0.0|0|81|512|0|0|0|69446|100%|
> |4|1400|1400|76217|1,270.2|0.0|0|97|517|0|0|0|76217|100%|
> |4|1550|1550|80216|1,336.8|0.0|0|152|810|0|0|0|80216|100%|
> |4|1700|1700|80797|1,346.5|0.0|0|271|864|0|0|0|80797|100%|
> |4|1850|1850|94172|1,569.3|0.0|0|182|822|0|0|0|94172|100%|
> |4|2000|1916|91014|1,516.8|0.0|0|253|48650|0|0|0|91014|100%|
> |4|2150|1916|95852|1,597.4|0.0|0|205|848|83|83|0|95769|99%|
> h3. 4 workers, 1 context
> !4-workers-1-context-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |4|500|500|29922|498.7|0.0|0|2|39|0|0|0|29922|100%|
> |4|650|650|38923|648.7|0.0|0|1|39|0|0|0|38923|100%|
> |4|800|800|47916|798.5|0.0|0|1|17|0|0|0|47916|100%|
> |4|950|950|56896|948.2|0.0|0|1|17|0|0|0|56896|100%|
> |4|1100|1100|65889|1,098.1|0.0|0|1|115|0|0|0|65889|100%|
> |4|1250|1250|74874|1,247.8|0.0|0|1|101|0|0|0|74874|100%|
> |4|1400|1400|83818|1,396.8|0.0|0|1|17|0|0|0|83818|100%|
> |4|1550|1550|92830|1,547.0|0.0|0|1|17|0|0|0|92830|100%|
> |4|1700|1700|101805|1,696.6|0.0|0|1|11|0|0|0|101805|100%|
> |4|1850|1850|110785|1,846.3|0.0|0|1|11|0|0|0|110785|100%|
> |4|2000|1916|113747|1,895.6|0.0|0|10|53108|0|0|0|113747|100%|
> |4|2150|1916|114825|1,913.6|0.0|0|1|24|83|83|0|114742|99%|
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11 years, 1 month
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[JBoss JIRA] (MODCLUSTER-372) Number of registered contexts negatively affects mod_cluster performance
by Michal Babacek (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-372?page=com.atlassian.jira.pl... ]
Michal Babacek updated MODCLUSTER-372:
--------------------------------------
Description:
There is a performance concern regarding CPU usage on the Apache HTTP Server with
mod_cluster set up as a load balancer.
Perf tests revealed that the major variable affecting the CPU usage is the overall number of registered contexts.
It's noteworthy that these contexts actually don't need to be accessed at all, it's enough that they are present.
Stay tuned for some profiler outputs...
The first test [9 workers, 31 contexts, round robin|https://issues.jboss.org/browse/MODCLUSTER-372#9workers%2C31context...]
depicts a behavior where all contexts are being accessed in a round robin fashion. Note the CPU usage. If we compare it to the [9 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372
#9workers%2C1context] test, it becomes apparent that there is something wrong with the CPU usage. As it is clear from the [9 workers, 31 contexts, access 1|https://issues.jboss.org/browse/MODCLUSTER-372
#9workers%2C31contexts%2Caccessingonlyoneofthem] test, accessing only one of these contexts doesn't help much.
The last two tests, [4 workers, 61 contexts, accessing 1|https://issues.jboss.org/browse/MODCLUSTER-372#4workers%2C61contexts%2C...
] and [4 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372
#4workers%2C1context] confirm the results, environment differs only in number of nodes and number of contexts.
h3. 9 workers, 31 contexts, round robin
!9-workers-31-context-round-robin-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8843|147.4|15|60|0|8843|100%|
|9|250|250|14422|240.3|37|215|0|14422|100%|
|9|350|350|17551|292.5|196|443|0|17551|100%|
|9|450|450|21303|355.0|269|603|0|21303|100%|
|9|550|550|24818|413.6|325|686|0|24818|100%|
|9|650|650|26804|446.7|469|800|0|26804|100%|
|9|750|750|29930|498.8|507|985|0|29930|100%|
|9|850|850|30665|511.0|665|1185|0|30665|100%|
|9|950|950|34421|573.6|647|1316|0|34421|100%|
|9|1050|1050|35067|584.4|800|1487|0|35067|100%|
|9|1150|1150|36024|600.4|925|1612|0|36024|100%|
|9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
|9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
|9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
|9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
|9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
|9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
|9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
|9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
|9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
|9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
|9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
h3. 9 workers, 31 contexts, accessing only one of them
!9-workers-31-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8954|149.2|4|42|0|8954|100%|
|9|250|250|14897|248.3|7|33|0|14897|100%|
|9|350|350|20784|346.4|8|68|0|20784|100%|
|9|450|450|26748|445.8|8|69|0|26748|100%|
|9|550|550|32553|542.5|11|92|0|32553|100%|
|9|650|650|38558|642.6|10|60|0|38558|100%|
|9|750|750|43571|726.1|29|329|0|43571|100%|
|9|850|850|46133|768.8|99|494|0|46133|100%|
|9|950|950|50854|847.5|120|501|0|50854|100%|
|9|1050|1050|54451|907.4|154|584|0|54451|100%|
|9|1150|1150|59961|999.3|138|674|0|59961|100%|
|9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
|9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
|9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
|9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
|9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
|9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
|9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
|9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
|9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
|9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
|9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
h3. 9 workers, 1 context
!9-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8965|149.4|2|12|0|8965|100%|
|9|250|250|14965|249.4|2|22|0|14965|100%|
|9|350|350|20950|349.1|2|23|0|20950|100%|
|9|450|450|26941|449.0|2|26|0|26941|100%|
|9|550|550|32937|548.9|1|26|0|32937|100%|
|9|650|650|38900|648.3|1|19|0|38900|100%|
|9|750|750|44918|748.6|1|11|0|44918|100%|
|9|850|850|50902|848.3|2|22|0|50902|100%|
|9|950|950|56878|947.9|1|14|0|56878|100%|
|9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
|9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
|9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
|9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
|9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
|9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
|9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
|9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
|9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
|9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
|9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
|9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
|9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
h3. 4 workers, 61 contexts, accessing only one of them
!4-workers-61-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29796|496.6|0.0|0|6|52|0|0|0|29796|100%|
|4|650|650|38706|645.0|0.0|0|7|149|0|0|0|38706|100%|
|4|800|800|47585|793.0|0.0|0|8|129|0|0|0|47585|100%|
|4|950|950|54467|907.7|0.0|0|43|377|0|0|0|54467|100%|
|4|1100|1100|62500|1,041.6|0.0|0|54|396|0|0|0|62500|100%|
|4|1250|1250|69446|1,157.3|0.0|0|81|512|0|0|0|69446|100%|
|4|1400|1400|76217|1,270.2|0.0|0|97|517|0|0|0|76217|100%|
|4|1550|1550|80216|1,336.8|0.0|0|152|810|0|0|0|80216|100%|
|4|1700|1700|80797|1,346.5|0.0|0|271|864|0|0|0|80797|100%|
|4|1850|1850|94172|1,569.3|0.0|0|182|822|0|0|0|94172|100%|
|4|2000|1916|91014|1,516.8|0.0|0|253|48650|0|0|0|91014|100%|
|4|2150|1916|95852|1,597.4|0.0|0|205|848|83|83|0|95769|99%|
h3. 4 workers, 1 context
!4-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29922|498.7|0.0|0|2|39|0|0|0|29922|100%|
|4|650|650|38923|648.7|0.0|0|1|39|0|0|0|38923|100%|
|4|800|800|47916|798.5|0.0|0|1|17|0|0|0|47916|100%|
|4|950|950|56896|948.2|0.0|0|1|17|0|0|0|56896|100%|
|4|1100|1100|65889|1,098.1|0.0|0|1|115|0|0|0|65889|100%|
|4|1250|1250|74874|1,247.8|0.0|0|1|101|0|0|0|74874|100%|
|4|1400|1400|83818|1,396.8|0.0|0|1|17|0|0|0|83818|100%|
|4|1550|1550|92830|1,547.0|0.0|0|1|17|0|0|0|92830|100%|
|4|1700|1700|101805|1,696.6|0.0|0|1|11|0|0|0|101805|100%|
|4|1850|1850|110785|1,846.3|0.0|0|1|11|0|0|0|110785|100%|
|4|2000|1916|113747|1,895.6|0.0|0|10|53108|0|0|0|113747|100%|
|4|2150|1916|114825|1,913.6|0.0|0|1|24|83|83|0|114742|99%|
was:
h3. 9 workers, 31 contexts, round robin
!9-workers-31-context-round-robin-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8843|147.4|15|60|0|8843|100%|
|9|250|250|14422|240.3|37|215|0|14422|100%|
|9|350|350|17551|292.5|196|443|0|17551|100%|
|9|450|450|21303|355.0|269|603|0|21303|100%|
|9|550|550|24818|413.6|325|686|0|24818|100%|
|9|650|650|26804|446.7|469|800|0|26804|100%|
|9|750|750|29930|498.8|507|985|0|29930|100%|
|9|850|850|30665|511.0|665|1185|0|30665|100%|
|9|950|950|34421|573.6|647|1316|0|34421|100%|
|9|1050|1050|35067|584.4|800|1487|0|35067|100%|
|9|1150|1150|36024|600.4|925|1612|0|36024|100%|
|9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
|9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
|9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
|9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
|9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
|9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
|9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
|9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
|9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
|9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
|9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
h3. 9 workers, 31 contexts, accessing only one of them
!9-workers-31-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8954|149.2|4|42|0|8954|100%|
|9|250|250|14897|248.3|7|33|0|14897|100%|
|9|350|350|20784|346.4|8|68|0|20784|100%|
|9|450|450|26748|445.8|8|69|0|26748|100%|
|9|550|550|32553|542.5|11|92|0|32553|100%|
|9|650|650|38558|642.6|10|60|0|38558|100%|
|9|750|750|43571|726.1|29|329|0|43571|100%|
|9|850|850|46133|768.8|99|494|0|46133|100%|
|9|950|950|50854|847.5|120|501|0|50854|100%|
|9|1050|1050|54451|907.4|154|584|0|54451|100%|
|9|1150|1150|59961|999.3|138|674|0|59961|100%|
|9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
|9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
|9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
|9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
|9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
|9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
|9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
|9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
|9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
|9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
|9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
h3. 9 workers, 1 context
!9-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8965|149.4|2|12|0|8965|100%|
|9|250|250|14965|249.4|2|22|0|14965|100%|
|9|350|350|20950|349.1|2|23|0|20950|100%|
|9|450|450|26941|449.0|2|26|0|26941|100%|
|9|550|550|32937|548.9|1|26|0|32937|100%|
|9|650|650|38900|648.3|1|19|0|38900|100%|
|9|750|750|44918|748.6|1|11|0|44918|100%|
|9|850|850|50902|848.3|2|22|0|50902|100%|
|9|950|950|56878|947.9|1|14|0|56878|100%|
|9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
|9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
|9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
|9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
|9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
|9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
|9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
|9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
|9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
|9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
|9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
|9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
|9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
h3. 4 workers, 61 contexts, accessing only one of them
!4-workers-61-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29796|496.6|0.0|0|6|52|0|0|0|29796|100%|
|4|650|650|38706|645.0|0.0|0|7|149|0|0|0|38706|100%|
|4|800|800|47585|793.0|0.0|0|8|129|0|0|0|47585|100%|
|4|950|950|54467|907.7|0.0|0|43|377|0|0|0|54467|100%|
|4|1100|1100|62500|1,041.6|0.0|0|54|396|0|0|0|62500|100%|
|4|1250|1250|69446|1,157.3|0.0|0|81|512|0|0|0|69446|100%|
|4|1400|1400|76217|1,270.2|0.0|0|97|517|0|0|0|76217|100%|
|4|1550|1550|80216|1,336.8|0.0|0|152|810|0|0|0|80216|100%|
|4|1700|1700|80797|1,346.5|0.0|0|271|864|0|0|0|80797|100%|
|4|1850|1850|94172|1,569.3|0.0|0|182|822|0|0|0|94172|100%|
|4|2000|1916|91014|1,516.8|0.0|0|253|48650|0|0|0|91014|100%|
|4|2150|1916|95852|1,597.4|0.0|0|205|848|83|83|0|95769|99%|
h3. 4 workers, 1 context
!4-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29922|498.7|0.0|0|2|39|0|0|0|29922|100%|
|4|650|650|38923|648.7|0.0|0|1|39|0|0|0|38923|100%|
|4|800|800|47916|798.5|0.0|0|1|17|0|0|0|47916|100%|
|4|950|950|56896|948.2|0.0|0|1|17|0|0|0|56896|100%|
|4|1100|1100|65889|1,098.1|0.0|0|1|115|0|0|0|65889|100%|
|4|1250|1250|74874|1,247.8|0.0|0|1|101|0|0|0|74874|100%|
|4|1400|1400|83818|1,396.8|0.0|0|1|17|0|0|0|83818|100%|
|4|1550|1550|92830|1,547.0|0.0|0|1|17|0|0|0|92830|100%|
|4|1700|1700|101805|1,696.6|0.0|0|1|11|0|0|0|101805|100%|
|4|1850|1850|110785|1,846.3|0.0|0|1|11|0|0|0|110785|100%|
|4|2000|1916|113747|1,895.6|0.0|0|10|53108|0|0|0|113747|100%|
|4|2150|1916|114825|1,913.6|0.0|0|1|24|83|83|0|114742|99%|
> Number of registered contexts negatively affects mod_cluster performance
> ------------------------------------------------------------------------
>
> Key: MODCLUSTER-372
> URL: https://issues.jboss.org/browse/MODCLUSTER-372
> Project: mod_cluster
> Issue Type: Bug
> Affects Versions: 1.2.4.Final, 1.2.6.Final
> Environment: RHEL6, other platforms are to be confirmed.
> Reporter: Michal Babacek
> Assignee: Michal Babacek
> Labels: mod_cluster, performace
> Fix For: 1.2.7.Final, 1.3.0.Alpha2
>
> Attachments: 4-workers-1-context-balancer-cpu.png, 4-workers-61-context-accessing-1-balancer-cpu.png, 9-workers-1-context-balancer-cpu.png, 9-workers-31-context-accessing-1-balancer-cpu.png, 9-workers-31-context-round-robin-balancer-cpu.png
>
>
> There is a performance concern regarding CPU usage on the Apache HTTP Server with
> mod_cluster set up as a load balancer.
> Perf tests revealed that the major variable affecting the CPU usage is the overall number of registered contexts.
> It's noteworthy that these contexts actually don't need to be accessed at all, it's enough that they are present.
> Stay tuned for some profiler outputs...
> The first test [9 workers, 31 contexts, round robin|https://issues.jboss.org/browse/MODCLUSTER-372#9workers%2C31context...]
> depicts a behavior where all contexts are being accessed in a round robin fashion. Note the CPU usage. If we compare it to the [9 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372
> #9workers%2C1context] test, it becomes apparent that there is something wrong with the CPU usage. As it is clear from the [9 workers, 31 contexts, access 1|https://issues.jboss.org/browse/MODCLUSTER-372
> #9workers%2C31contexts%2Caccessingonlyoneofthem] test, accessing only one of these contexts doesn't help much.
> The last two tests, [4 workers, 61 contexts, accessing 1|https://issues.jboss.org/browse/MODCLUSTER-372#4workers%2C61contexts%2C...
> ] and [4 workers, 1 context|https://issues.jboss.org/browse/MODCLUSTER-372
> #4workers%2C1context] confirm the results, environment differs only in number of nodes and number of contexts.
> h3. 9 workers, 31 contexts, round robin
> !9-workers-31-context-round-robin-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8843|147.4|15|60|0|8843|100%|
> |9|250|250|14422|240.3|37|215|0|14422|100%|
> |9|350|350|17551|292.5|196|443|0|17551|100%|
> |9|450|450|21303|355.0|269|603|0|21303|100%|
> |9|550|550|24818|413.6|325|686|0|24818|100%|
> |9|650|650|26804|446.7|469|800|0|26804|100%|
> |9|750|750|29930|498.8|507|985|0|29930|100%|
> |9|850|850|30665|511.0|665|1185|0|30665|100%|
> |9|950|950|34421|573.6|647|1316|0|34421|100%|
> |9|1050|1050|35067|584.4|800|1487|0|35067|100%|
> |9|1150|1150|36024|600.4|925|1612|0|36024|100%|
> |9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
> |9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
> |9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
> |9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
> |9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
> |9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
> |9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
> |9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
> |9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
> |9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
> |9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
> h3. 9 workers, 31 contexts, accessing only one of them
> !9-workers-31-context-accessing-1-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8954|149.2|4|42|0|8954|100%|
> |9|250|250|14897|248.3|7|33|0|14897|100%|
> |9|350|350|20784|346.4|8|68|0|20784|100%|
> |9|450|450|26748|445.8|8|69|0|26748|100%|
> |9|550|550|32553|542.5|11|92|0|32553|100%|
> |9|650|650|38558|642.6|10|60|0|38558|100%|
> |9|750|750|43571|726.1|29|329|0|43571|100%|
> |9|850|850|46133|768.8|99|494|0|46133|100%|
> |9|950|950|50854|847.5|120|501|0|50854|100%|
> |9|1050|1050|54451|907.4|154|584|0|54451|100%|
> |9|1150|1150|59961|999.3|138|674|0|59961|100%|
> |9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
> |9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
> |9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
> |9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
> |9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
> |9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
> |9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
> |9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
> |9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
> |9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
> |9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
> h3. 9 workers, 1 context
> !9-workers-1-context-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8965|149.4|2|12|0|8965|100%|
> |9|250|250|14965|249.4|2|22|0|14965|100%|
> |9|350|350|20950|349.1|2|23|0|20950|100%|
> |9|450|450|26941|449.0|2|26|0|26941|100%|
> |9|550|550|32937|548.9|1|26|0|32937|100%|
> |9|650|650|38900|648.3|1|19|0|38900|100%|
> |9|750|750|44918|748.6|1|11|0|44918|100%|
> |9|850|850|50902|848.3|2|22|0|50902|100%|
> |9|950|950|56878|947.9|1|14|0|56878|100%|
> |9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
> |9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
> |9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
> |9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
> |9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
> |9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
> |9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
> |9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
> |9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
> |9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
> |9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
> |9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
> |9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
> h3. 4 workers, 61 contexts, accessing only one of them
> !4-workers-61-context-accessing-1-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |4|500|500|29796|496.6|0.0|0|6|52|0|0|0|29796|100%|
> |4|650|650|38706|645.0|0.0|0|7|149|0|0|0|38706|100%|
> |4|800|800|47585|793.0|0.0|0|8|129|0|0|0|47585|100%|
> |4|950|950|54467|907.7|0.0|0|43|377|0|0|0|54467|100%|
> |4|1100|1100|62500|1,041.6|0.0|0|54|396|0|0|0|62500|100%|
> |4|1250|1250|69446|1,157.3|0.0|0|81|512|0|0|0|69446|100%|
> |4|1400|1400|76217|1,270.2|0.0|0|97|517|0|0|0|76217|100%|
> |4|1550|1550|80216|1,336.8|0.0|0|152|810|0|0|0|80216|100%|
> |4|1700|1700|80797|1,346.5|0.0|0|271|864|0|0|0|80797|100%|
> |4|1850|1850|94172|1,569.3|0.0|0|182|822|0|0|0|94172|100%|
> |4|2000|1916|91014|1,516.8|0.0|0|253|48650|0|0|0|91014|100%|
> |4|2150|1916|95852|1,597.4|0.0|0|205|848|83|83|0|95769|99%|
> h3. 4 workers, 1 context
> !4-workers-1-context-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |4|500|500|29922|498.7|0.0|0|2|39|0|0|0|29922|100%|
> |4|650|650|38923|648.7|0.0|0|1|39|0|0|0|38923|100%|
> |4|800|800|47916|798.5|0.0|0|1|17|0|0|0|47916|100%|
> |4|950|950|56896|948.2|0.0|0|1|17|0|0|0|56896|100%|
> |4|1100|1100|65889|1,098.1|0.0|0|1|115|0|0|0|65889|100%|
> |4|1250|1250|74874|1,247.8|0.0|0|1|101|0|0|0|74874|100%|
> |4|1400|1400|83818|1,396.8|0.0|0|1|17|0|0|0|83818|100%|
> |4|1550|1550|92830|1,547.0|0.0|0|1|17|0|0|0|92830|100%|
> |4|1700|1700|101805|1,696.6|0.0|0|1|11|0|0|0|101805|100%|
> |4|1850|1850|110785|1,846.3|0.0|0|1|11|0|0|0|110785|100%|
> |4|2000|1916|113747|1,895.6|0.0|0|10|53108|0|0|0|113747|100%|
> |4|2150|1916|114825|1,913.6|0.0|0|1|24|83|83|0|114742|99%|
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[JBoss JIRA] (MODCLUSTER-372) Number of registered contexts negatively affects mod_cluster performance
by Michal Babacek (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-372?page=com.atlassian.jira.pl... ]
Michal Babacek updated MODCLUSTER-372:
--------------------------------------
Description:
h3. 9 workers, 31 contexts, round robin
!9-workers-31-context-round-robin-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8843|147.4|15|60|0|8843|100%|
|9|250|250|14422|240.3|37|215|0|14422|100%|
|9|350|350|17551|292.5|196|443|0|17551|100%|
|9|450|450|21303|355.0|269|603|0|21303|100%|
|9|550|550|24818|413.6|325|686|0|24818|100%|
|9|650|650|26804|446.7|469|800|0|26804|100%|
|9|750|750|29930|498.8|507|985|0|29930|100%|
|9|850|850|30665|511.0|665|1185|0|30665|100%|
|9|950|950|34421|573.6|647|1316|0|34421|100%|
|9|1050|1050|35067|584.4|800|1487|0|35067|100%|
|9|1150|1150|36024|600.4|925|1612|0|36024|100%|
|9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
|9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
|9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
|9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
|9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
|9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
|9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
|9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
|9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
|9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
|9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
h3. 9 workers, 31 contexts, accessing only one of them
!9-workers-31-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8954|149.2|4|42|0|8954|100%|
|9|250|250|14897|248.3|7|33|0|14897|100%|
|9|350|350|20784|346.4|8|68|0|20784|100%|
|9|450|450|26748|445.8|8|69|0|26748|100%|
|9|550|550|32553|542.5|11|92|0|32553|100%|
|9|650|650|38558|642.6|10|60|0|38558|100%|
|9|750|750|43571|726.1|29|329|0|43571|100%|
|9|850|850|46133|768.8|99|494|0|46133|100%|
|9|950|950|50854|847.5|120|501|0|50854|100%|
|9|1050|1050|54451|907.4|154|584|0|54451|100%|
|9|1150|1150|59961|999.3|138|674|0|59961|100%|
|9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
|9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
|9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
|9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
|9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
|9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
|9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
|9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
|9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
|9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
|9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
h3. 9 workers, 1 context
!9-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8965|149.4|2|12|0|8965|100%|
|9|250|250|14965|249.4|2|22|0|14965|100%|
|9|350|350|20950|349.1|2|23|0|20950|100%|
|9|450|450|26941|449.0|2|26|0|26941|100%|
|9|550|550|32937|548.9|1|26|0|32937|100%|
|9|650|650|38900|648.3|1|19|0|38900|100%|
|9|750|750|44918|748.6|1|11|0|44918|100%|
|9|850|850|50902|848.3|2|22|0|50902|100%|
|9|950|950|56878|947.9|1|14|0|56878|100%|
|9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
|9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
|9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
|9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
|9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
|9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
|9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
|9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
|9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
|9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
|9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
|9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
|9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
h3. 4 workers, 61 contexts, accessing only one of them
!4-workers-61-context-accessing-1-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29796|496.6|0.0|0|6|52|0|0|0|29796|100%|
|4|650|650|38706|645.0|0.0|0|7|149|0|0|0|38706|100%|
|4|800|800|47585|793.0|0.0|0|8|129|0|0|0|47585|100%|
|4|950|950|54467|907.7|0.0|0|43|377|0|0|0|54467|100%|
|4|1100|1100|62500|1,041.6|0.0|0|54|396|0|0|0|62500|100%|
|4|1250|1250|69446|1,157.3|0.0|0|81|512|0|0|0|69446|100%|
|4|1400|1400|76217|1,270.2|0.0|0|97|517|0|0|0|76217|100%|
|4|1550|1550|80216|1,336.8|0.0|0|152|810|0|0|0|80216|100%|
|4|1700|1700|80797|1,346.5|0.0|0|271|864|0|0|0|80797|100%|
|4|1850|1850|94172|1,569.3|0.0|0|182|822|0|0|0|94172|100%|
|4|2000|1916|91014|1,516.8|0.0|0|253|48650|0|0|0|91014|100%|
|4|2150|1916|95852|1,597.4|0.0|0|205|848|83|83|0|95769|99%|
h3. 4 workers, 1 context
!4-workers-1-context-balancer-cpu.png|thumbnail!
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|4|500|500|29922|498.7|0.0|0|2|39|0|0|0|29922|100%|
|4|650|650|38923|648.7|0.0|0|1|39|0|0|0|38923|100%|
|4|800|800|47916|798.5|0.0|0|1|17|0|0|0|47916|100%|
|4|950|950|56896|948.2|0.0|0|1|17|0|0|0|56896|100%|
|4|1100|1100|65889|1,098.1|0.0|0|1|115|0|0|0|65889|100%|
|4|1250|1250|74874|1,247.8|0.0|0|1|101|0|0|0|74874|100%|
|4|1400|1400|83818|1,396.8|0.0|0|1|17|0|0|0|83818|100%|
|4|1550|1550|92830|1,547.0|0.0|0|1|17|0|0|0|92830|100%|
|4|1700|1700|101805|1,696.6|0.0|0|1|11|0|0|0|101805|100%|
|4|1850|1850|110785|1,846.3|0.0|0|1|11|0|0|0|110785|100%|
|4|2000|1916|113747|1,895.6|0.0|0|10|53108|0|0|0|113747|100%|
|4|2150|1916|114825|1,913.6|0.0|0|1|24|83|83|0|114742|99%|
was:
h3. 9 workers, 31 contexts, round robin
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8843|147.4|15|60|0|8843|100%|
|9|250|250|14422|240.3|37|215|0|14422|100%|
|9|350|350|17551|292.5|196|443|0|17551|100%|
|9|450|450|21303|355.0|269|603|0|21303|100%|
|9|550|550|24818|413.6|325|686|0|24818|100%|
|9|650|650|26804|446.7|469|800|0|26804|100%|
|9|750|750|29930|498.8|507|985|0|29930|100%|
|9|850|850|30665|511.0|665|1185|0|30665|100%|
|9|950|950|34421|573.6|647|1316|0|34421|100%|
|9|1050|1050|35067|584.4|800|1487|0|35067|100%|
|9|1150|1150|36024|600.4|925|1612|0|36024|100%|
|9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
|9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
|9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
|9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
|9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
|9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
|9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
|9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
|9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
|9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
|9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
h3. 9 workers, 31 contexts, accessing only one of them
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8954|149.2|4|42|0|8954|100%|
|9|250|250|14897|248.3|7|33|0|14897|100%|
|9|350|350|20784|346.4|8|68|0|20784|100%|
|9|450|450|26748|445.8|8|69|0|26748|100%|
|9|550|550|32553|542.5|11|92|0|32553|100%|
|9|650|650|38558|642.6|10|60|0|38558|100%|
|9|750|750|43571|726.1|29|329|0|43571|100%|
|9|850|850|46133|768.8|99|494|0|46133|100%|
|9|950|950|50854|847.5|120|501|0|50854|100%|
|9|1050|1050|54451|907.4|154|584|0|54451|100%|
|9|1150|1150|59961|999.3|138|674|0|59961|100%|
|9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
|9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
|9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
|9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
|9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
|9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
|9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
|9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
|9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
|9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
|9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
h3. 9 workers, 1 context
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8965|149.4|2|12|0|8965|100%|
|9|250|250|14965|249.4|2|22|0|14965|100%|
|9|350|350|20950|349.1|2|23|0|20950|100%|
|9|450|450|26941|449.0|2|26|0|26941|100%|
|9|550|550|32937|548.9|1|26|0|32937|100%|
|9|650|650|38900|648.3|1|19|0|38900|100%|
|9|750|750|44918|748.6|1|11|0|44918|100%|
|9|850|850|50902|848.3|2|22|0|50902|100%|
|9|950|950|56878|947.9|1|14|0|56878|100%|
|9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
|9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
|9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
|9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
|9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
|9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
|9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
|9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
|9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
|9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
|9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
|9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
|9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
> Number of registered contexts negatively affects mod_cluster performance
> ------------------------------------------------------------------------
>
> Key: MODCLUSTER-372
> URL: https://issues.jboss.org/browse/MODCLUSTER-372
> Project: mod_cluster
> Issue Type: Bug
> Affects Versions: 1.2.4.Final, 1.2.6.Final
> Environment: RHEL6, other platforms are to be confirmed.
> Reporter: Michal Babacek
> Assignee: Michal Babacek
> Labels: mod_cluster, performace
> Fix For: 1.2.7.Final, 1.3.0.Alpha2
>
> Attachments: 4-workers-1-context-balancer-cpu.png, 4-workers-61-context-accessing-1-balancer-cpu.png, 9-workers-1-context-balancer-cpu.png, 9-workers-31-context-accessing-1-balancer-cpu.png, 9-workers-31-context-round-robin-balancer-cpu.png
>
>
> h3. 9 workers, 31 contexts, round robin
> !9-workers-31-context-round-robin-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8843|147.4|15|60|0|8843|100%|
> |9|250|250|14422|240.3|37|215|0|14422|100%|
> |9|350|350|17551|292.5|196|443|0|17551|100%|
> |9|450|450|21303|355.0|269|603|0|21303|100%|
> |9|550|550|24818|413.6|325|686|0|24818|100%|
> |9|650|650|26804|446.7|469|800|0|26804|100%|
> |9|750|750|29930|498.8|507|985|0|29930|100%|
> |9|850|850|30665|511.0|665|1185|0|30665|100%|
> |9|950|950|34421|573.6|647|1316|0|34421|100%|
> |9|1050|1050|35067|584.4|800|1487|0|35067|100%|
> |9|1150|1150|36024|600.4|925|1612|0|36024|100%|
> |9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
> |9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
> |9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
> |9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
> |9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
> |9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
> |9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
> |9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
> |9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
> |9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
> |9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
> h3. 9 workers, 31 contexts, accessing only one of them
> !9-workers-31-context-accessing-1-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8954|149.2|4|42|0|8954|100%|
> |9|250|250|14897|248.3|7|33|0|14897|100%|
> |9|350|350|20784|346.4|8|68|0|20784|100%|
> |9|450|450|26748|445.8|8|69|0|26748|100%|
> |9|550|550|32553|542.5|11|92|0|32553|100%|
> |9|650|650|38558|642.6|10|60|0|38558|100%|
> |9|750|750|43571|726.1|29|329|0|43571|100%|
> |9|850|850|46133|768.8|99|494|0|46133|100%|
> |9|950|950|50854|847.5|120|501|0|50854|100%|
> |9|1050|1050|54451|907.4|154|584|0|54451|100%|
> |9|1150|1150|59961|999.3|138|674|0|59961|100%|
> |9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
> |9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
> |9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
> |9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
> |9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
> |9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
> |9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
> |9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
> |9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
> |9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
> |9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
> h3. 9 workers, 1 context
> !9-workers-1-context-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8965|149.4|2|12|0|8965|100%|
> |9|250|250|14965|249.4|2|22|0|14965|100%|
> |9|350|350|20950|349.1|2|23|0|20950|100%|
> |9|450|450|26941|449.0|2|26|0|26941|100%|
> |9|550|550|32937|548.9|1|26|0|32937|100%|
> |9|650|650|38900|648.3|1|19|0|38900|100%|
> |9|750|750|44918|748.6|1|11|0|44918|100%|
> |9|850|850|50902|848.3|2|22|0|50902|100%|
> |9|950|950|56878|947.9|1|14|0|56878|100%|
> |9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
> |9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
> |9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
> |9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
> |9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
> |9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
> |9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
> |9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
> |9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
> |9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
> |9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
> |9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
> |9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
> h3. 4 workers, 61 contexts, accessing only one of them
> !4-workers-61-context-accessing-1-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |4|500|500|29796|496.6|0.0|0|6|52|0|0|0|29796|100%|
> |4|650|650|38706|645.0|0.0|0|7|149|0|0|0|38706|100%|
> |4|800|800|47585|793.0|0.0|0|8|129|0|0|0|47585|100%|
> |4|950|950|54467|907.7|0.0|0|43|377|0|0|0|54467|100%|
> |4|1100|1100|62500|1,041.6|0.0|0|54|396|0|0|0|62500|100%|
> |4|1250|1250|69446|1,157.3|0.0|0|81|512|0|0|0|69446|100%|
> |4|1400|1400|76217|1,270.2|0.0|0|97|517|0|0|0|76217|100%|
> |4|1550|1550|80216|1,336.8|0.0|0|152|810|0|0|0|80216|100%|
> |4|1700|1700|80797|1,346.5|0.0|0|271|864|0|0|0|80797|100%|
> |4|1850|1850|94172|1,569.3|0.0|0|182|822|0|0|0|94172|100%|
> |4|2000|1916|91014|1,516.8|0.0|0|253|48650|0|0|0|91014|100%|
> |4|2150|1916|95852|1,597.4|0.0|0|205|848|83|83|0|95769|99%|
> h3. 4 workers, 1 context
> !4-workers-1-context-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |4|500|500|29922|498.7|0.0|0|2|39|0|0|0|29922|100%|
> |4|650|650|38923|648.7|0.0|0|1|39|0|0|0|38923|100%|
> |4|800|800|47916|798.5|0.0|0|1|17|0|0|0|47916|100%|
> |4|950|950|56896|948.2|0.0|0|1|17|0|0|0|56896|100%|
> |4|1100|1100|65889|1,098.1|0.0|0|1|115|0|0|0|65889|100%|
> |4|1250|1250|74874|1,247.8|0.0|0|1|101|0|0|0|74874|100%|
> |4|1400|1400|83818|1,396.8|0.0|0|1|17|0|0|0|83818|100%|
> |4|1550|1550|92830|1,547.0|0.0|0|1|17|0|0|0|92830|100%|
> |4|1700|1700|101805|1,696.6|0.0|0|1|11|0|0|0|101805|100%|
> |4|1850|1850|110785|1,846.3|0.0|0|1|11|0|0|0|110785|100%|
> |4|2000|1916|113747|1,895.6|0.0|0|10|53108|0|0|0|113747|100%|
> |4|2150|1916|114825|1,913.6|0.0|0|1|24|83|83|0|114742|99%|
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11 years, 1 month
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[JBoss JIRA] (MODCLUSTER-372) Number of registered contexts negatively affects mod_cluster performance
by Michal Babacek (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-372?page=com.atlassian.jira.pl... ]
Michal Babacek updated MODCLUSTER-372:
--------------------------------------
Attachment: 4-workers-1-context-balancer-cpu.png
4-workers-61-context-accessing-1-balancer-cpu.png
9-workers-31-context-accessing-1-balancer-cpu.png
9-workers-31-context-round-robin-balancer-cpu.png
9-workers-1-context-balancer-cpu.png
> Number of registered contexts negatively affects mod_cluster performance
> ------------------------------------------------------------------------
>
> Key: MODCLUSTER-372
> URL: https://issues.jboss.org/browse/MODCLUSTER-372
> Project: mod_cluster
> Issue Type: Bug
> Affects Versions: 1.2.4.Final, 1.2.6.Final
> Environment: RHEL6, other platforms are to be confirmed.
> Reporter: Michal Babacek
> Assignee: Michal Babacek
> Labels: mod_cluster, performace
> Fix For: 1.2.7.Final, 1.3.0.Alpha2
>
> Attachments: 4-workers-1-context-balancer-cpu.png, 4-workers-61-context-accessing-1-balancer-cpu.png, 9-workers-1-context-balancer-cpu.png, 9-workers-31-context-accessing-1-balancer-cpu.png, 9-workers-31-context-round-robin-balancer-cpu.png
>
>
> h3. 9 workers, 31 contexts, round robin
> !9-workers-31-context-round-robin-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8843|147.4|15|60|0|8843|100%|
> |9|250|250|14422|240.3|37|215|0|14422|100%|
> |9|350|350|17551|292.5|196|443|0|17551|100%|
> |9|450|450|21303|355.0|269|603|0|21303|100%|
> |9|550|550|24818|413.6|325|686|0|24818|100%|
> |9|650|650|26804|446.7|469|800|0|26804|100%|
> |9|750|750|29930|498.8|507|985|0|29930|100%|
> |9|850|850|30665|511.0|665|1185|0|30665|100%|
> |9|950|950|34421|573.6|647|1316|0|34421|100%|
> |9|1050|1050|35067|584.4|800|1487|0|35067|100%|
> |9|1150|1150|36024|600.4|925|1612|0|36024|100%|
> |9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
> |9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
> |9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
> |9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
> |9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
> |9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
> |9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
> |9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
> |9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
> |9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
> |9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
> h3. 9 workers, 31 contexts, accessing only one of them
> !9-workers-31-context-accessing-1-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8954|149.2|4|42|0|8954|100%|
> |9|250|250|14897|248.3|7|33|0|14897|100%|
> |9|350|350|20784|346.4|8|68|0|20784|100%|
> |9|450|450|26748|445.8|8|69|0|26748|100%|
> |9|550|550|32553|542.5|11|92|0|32553|100%|
> |9|650|650|38558|642.6|10|60|0|38558|100%|
> |9|750|750|43571|726.1|29|329|0|43571|100%|
> |9|850|850|46133|768.8|99|494|0|46133|100%|
> |9|950|950|50854|847.5|120|501|0|50854|100%|
> |9|1050|1050|54451|907.4|154|584|0|54451|100%|
> |9|1150|1150|59961|999.3|138|674|0|59961|100%|
> |9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
> |9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
> |9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
> |9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
> |9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
> |9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
> |9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
> |9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
> |9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
> |9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
> |9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
> h3. 9 workers, 1 context
> !9-workers-1-context-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8965|149.4|2|12|0|8965|100%|
> |9|250|250|14965|249.4|2|22|0|14965|100%|
> |9|350|350|20950|349.1|2|23|0|20950|100%|
> |9|450|450|26941|449.0|2|26|0|26941|100%|
> |9|550|550|32937|548.9|1|26|0|32937|100%|
> |9|650|650|38900|648.3|1|19|0|38900|100%|
> |9|750|750|44918|748.6|1|11|0|44918|100%|
> |9|850|850|50902|848.3|2|22|0|50902|100%|
> |9|950|950|56878|947.9|1|14|0|56878|100%|
> |9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
> |9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
> |9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
> |9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
> |9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
> |9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
> |9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
> |9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
> |9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
> |9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
> |9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
> |9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
> |9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
> h3. 4 workers, 61 contexts, accessing only one of them
> !4-workers-61-context-accessing-1-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |4|500|500|29796|496.6|0.0|0|6|52|0|0|0|29796|100%|
> |4|650|650|38706|645.0|0.0|0|7|149|0|0|0|38706|100%|
> |4|800|800|47585|793.0|0.0|0|8|129|0|0|0|47585|100%|
> |4|950|950|54467|907.7|0.0|0|43|377|0|0|0|54467|100%|
> |4|1100|1100|62500|1,041.6|0.0|0|54|396|0|0|0|62500|100%|
> |4|1250|1250|69446|1,157.3|0.0|0|81|512|0|0|0|69446|100%|
> |4|1400|1400|76217|1,270.2|0.0|0|97|517|0|0|0|76217|100%|
> |4|1550|1550|80216|1,336.8|0.0|0|152|810|0|0|0|80216|100%|
> |4|1700|1700|80797|1,346.5|0.0|0|271|864|0|0|0|80797|100%|
> |4|1850|1850|94172|1,569.3|0.0|0|182|822|0|0|0|94172|100%|
> |4|2000|1916|91014|1,516.8|0.0|0|253|48650|0|0|0|91014|100%|
> |4|2150|1916|95852|1,597.4|0.0|0|205|848|83|83|0|95769|99%|
> h3. 4 workers, 1 context
> !4-workers-1-context-balancer-cpu.png|thumbnail!
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |4|500|500|29922|498.7|0.0|0|2|39|0|0|0|29922|100%|
> |4|650|650|38923|648.7|0.0|0|1|39|0|0|0|38923|100%|
> |4|800|800|47916|798.5|0.0|0|1|17|0|0|0|47916|100%|
> |4|950|950|56896|948.2|0.0|0|1|17|0|0|0|56896|100%|
> |4|1100|1100|65889|1,098.1|0.0|0|1|115|0|0|0|65889|100%|
> |4|1250|1250|74874|1,247.8|0.0|0|1|101|0|0|0|74874|100%|
> |4|1400|1400|83818|1,396.8|0.0|0|1|17|0|0|0|83818|100%|
> |4|1550|1550|92830|1,547.0|0.0|0|1|17|0|0|0|92830|100%|
> |4|1700|1700|101805|1,696.6|0.0|0|1|11|0|0|0|101805|100%|
> |4|1850|1850|110785|1,846.3|0.0|0|1|11|0|0|0|110785|100%|
> |4|2000|1916|113747|1,895.6|0.0|0|10|53108|0|0|0|113747|100%|
> |4|2150|1916|114825|1,913.6|0.0|0|1|24|83|83|0|114742|99%|
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11 years, 1 month
- 1
- 0
[JBoss JIRA] (MODCLUSTER-372) Number of registered contexts negatively affects mod_cluster performance
by Radoslav Husar (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-372?page=com.atlassian.jira.pl... ]
Radoslav Husar updated MODCLUSTER-372:
--------------------------------------
Fix Version/s: 1.2.7.Final
1.3.0.Alpha2
> Number of registered contexts negatively affects mod_cluster performance
> ------------------------------------------------------------------------
>
> Key: MODCLUSTER-372
> URL: https://issues.jboss.org/browse/MODCLUSTER-372
> Project: mod_cluster
> Issue Type: Bug
> Affects Versions: 1.2.4.Final, 1.2.6.Final
> Environment: RHEL6, other platforms are to be confirmed.
> Reporter: Michal Babacek
> Assignee: Michal Babacek
> Labels: mod_cluster, performace
> Fix For: 1.2.7.Final, 1.3.0.Alpha2
>
>
> h3. 9 workers, 31 contexts, round robin
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8843|147.4|15|60|0|8843|100%|
> |9|250|250|14422|240.3|37|215|0|14422|100%|
> |9|350|350|17551|292.5|196|443|0|17551|100%|
> |9|450|450|21303|355.0|269|603|0|21303|100%|
> |9|550|550|24818|413.6|325|686|0|24818|100%|
> |9|650|650|26804|446.7|469|800|0|26804|100%|
> |9|750|750|29930|498.8|507|985|0|29930|100%|
> |9|850|850|30665|511.0|665|1185|0|30665|100%|
> |9|950|950|34421|573.6|647|1316|0|34421|100%|
> |9|1050|1050|35067|584.4|800|1487|0|35067|100%|
> |9|1150|1150|36024|600.4|925|1612|0|36024|100%|
> |9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
> |9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
> |9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
> |9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
> |9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
> |9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
> |9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
> |9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
> |9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
> |9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
> |9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
> h3. 9 workers, 31 contexts, accessing only one of them
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8954|149.2|4|42|0|8954|100%|
> |9|250|250|14897|248.3|7|33|0|14897|100%|
> |9|350|350|20784|346.4|8|68|0|20784|100%|
> |9|450|450|26748|445.8|8|69|0|26748|100%|
> |9|550|550|32553|542.5|11|92|0|32553|100%|
> |9|650|650|38558|642.6|10|60|0|38558|100%|
> |9|750|750|43571|726.1|29|329|0|43571|100%|
> |9|850|850|46133|768.8|99|494|0|46133|100%|
> |9|950|950|50854|847.5|120|501|0|50854|100%|
> |9|1050|1050|54451|907.4|154|584|0|54451|100%|
> |9|1150|1150|59961|999.3|138|674|0|59961|100%|
> |9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
> |9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
> |9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
> |9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
> |9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
> |9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
> |9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
> |9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
> |9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
> |9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
> |9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
> h3. 9 workers, 1 context
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8965|149.4|2|12|0|8965|100%|
> |9|250|250|14965|249.4|2|22|0|14965|100%|
> |9|350|350|20950|349.1|2|23|0|20950|100%|
> |9|450|450|26941|449.0|2|26|0|26941|100%|
> |9|550|550|32937|548.9|1|26|0|32937|100%|
> |9|650|650|38900|648.3|1|19|0|38900|100%|
> |9|750|750|44918|748.6|1|11|0|44918|100%|
> |9|850|850|50902|848.3|2|22|0|50902|100%|
> |9|950|950|56878|947.9|1|14|0|56878|100%|
> |9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
> |9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
> |9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
> |9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
> |9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
> |9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
> |9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
> |9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
> |9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
> |9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
> |9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
> |9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
> |9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
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11 years, 1 month
- 1
- 0
[JBoss JIRA] (MODCLUSTER-372) Number of registered contexts negatively affects mod_cluster performance
by Michal Babacek (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-372?page=com.atlassian.jira.pl... ]
Michal Babacek updated MODCLUSTER-372:
--------------------------------------
Description:
h3. 9 workers, 31 contexts, round robin
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8843|147.4|15|60|0|8843|100%|
|9|250|250|14422|240.3|37|215|0|14422|100%|
|9|350|350|17551|292.5|196|443|0|17551|100%|
|9|450|450|21303|355.0|269|603|0|21303|100%|
|9|550|550|24818|413.6|325|686|0|24818|100%|
|9|650|650|26804|446.7|469|800|0|26804|100%|
|9|750|750|29930|498.8|507|985|0|29930|100%|
|9|850|850|30665|511.0|665|1185|0|30665|100%|
|9|950|950|34421|573.6|647|1316|0|34421|100%|
|9|1050|1050|35067|584.4|800|1487|0|35067|100%|
|9|1150|1150|36024|600.4|925|1612|0|36024|100%|
|9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
|9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
|9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
|9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
|9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
|9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
|9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
|9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
|9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
|9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
|9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
h3. 9 workers, 31 contexts, accessing only one of them
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8954|149.2|4|42|0|8954|100%|
|9|250|250|14897|248.3|7|33|0|14897|100%|
|9|350|350|20784|346.4|8|68|0|20784|100%|
|9|450|450|26748|445.8|8|69|0|26748|100%|
|9|550|550|32553|542.5|11|92|0|32553|100%|
|9|650|650|38558|642.6|10|60|0|38558|100%|
|9|750|750|43571|726.1|29|329|0|43571|100%|
|9|850|850|46133|768.8|99|494|0|46133|100%|
|9|950|950|50854|847.5|120|501|0|50854|100%|
|9|1050|1050|54451|907.4|154|584|0|54451|100%|
|9|1150|1150|59961|999.3|138|674|0|59961|100%|
|9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
|9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
|9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
|9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
|9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
|9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
|9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
|9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
|9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
|9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
|9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
h3. 9 workers, 1 context
||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
|9|150|150|8965|149.4|2|12|0|8965|100%|
|9|250|250|14965|249.4|2|22|0|14965|100%|
|9|350|350|20950|349.1|2|23|0|20950|100%|
|9|450|450|26941|449.0|2|26|0|26941|100%|
|9|550|550|32937|548.9|1|26|0|32937|100%|
|9|650|650|38900|648.3|1|19|0|38900|100%|
|9|750|750|44918|748.6|1|11|0|44918|100%|
|9|850|850|50902|848.3|2|22|0|50902|100%|
|9|950|950|56878|947.9|1|14|0|56878|100%|
|9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
|9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
|9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
|9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
|9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
|9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
|9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
|9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
|9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
|9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
|9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
|9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
|9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
was:Detailed description and statistics are coming soon...
> Number of registered contexts negatively affects mod_cluster performance
> ------------------------------------------------------------------------
>
> Key: MODCLUSTER-372
> URL: https://issues.jboss.org/browse/MODCLUSTER-372
> Project: mod_cluster
> Issue Type: Bug
> Affects Versions: 1.2.4.Final, 1.2.6.Final
> Environment: RHEL6, other platforms are to be confirmed.
> Reporter: Michal Babacek
> Assignee: Michal Babacek
> Labels: mod_cluster, performace
>
> h3. 9 workers, 31 contexts, round robin
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8843|147.4|15|60|0|8843|100%|
> |9|250|250|14422|240.3|37|215|0|14422|100%|
> |9|350|350|17551|292.5|196|443|0|17551|100%|
> |9|450|450|21303|355.0|269|603|0|21303|100%|
> |9|550|550|24818|413.6|325|686|0|24818|100%|
> |9|650|650|26804|446.7|469|800|0|26804|100%|
> |9|750|750|29930|498.8|507|985|0|29930|100%|
> |9|850|850|30665|511.0|665|1185|0|30665|100%|
> |9|950|950|34421|573.6|647|1316|0|34421|100%|
> |9|1050|1050|35067|584.4|800|1487|0|35067|100%|
> |9|1150|1150|36024|600.4|925|1612|0|36024|100%|
> |9|1250|1250|36635|610.5|1030|1815|0|36635|100%|
> |9|1350|1350|38395|639.9|1096|1942|0|38395|100%|
> |9|1450|1450|39713|661.8|1170|2466|0|39713|100%|
> |9|1550|1550|39455|657.5|1392|2340|0|39455|100%|
> |9|1650|1650|39849|664.1|1465|4240|0|39849|100%|
> |9|1750|1750|42435|707.2|1454|6511|0|42435|100%|
> |9|1850|1850|44714|745.2|1498|4866|0|44714|100%|
> |9|1950|1911|46072|767.8|1554|43016|0|46072|100%|
> |9|2050|1911|44496|741.5|1617|4953|39|44457|99%|
> |9|2150|1911|43715|728.5|1632|5348|125|43590|99%|
> |9|2250|1911|41112|685.1|1764|9800|155|40957|99%|
> h3. 9 workers, 31 contexts, accessing only one of them
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8954|149.2|4|42|0|8954|100%|
> |9|250|250|14897|248.3|7|33|0|14897|100%|
> |9|350|350|20784|346.4|8|68|0|20784|100%|
> |9|450|450|26748|445.8|8|69|0|26748|100%|
> |9|550|550|32553|542.5|11|92|0|32553|100%|
> |9|650|650|38558|642.6|10|60|0|38558|100%|
> |9|750|750|43571|726.1|29|329|0|43571|100%|
> |9|850|850|46133|768.8|99|494|0|46133|100%|
> |9|950|950|50854|847.5|120|501|0|50854|100%|
> |9|1050|1050|54451|907.4|154|584|0|54451|100%|
> |9|1150|1150|59961|999.3|138|674|0|59961|100%|
> |9|1250|1250|62567|1,042.6|198|675|0|62567|100%|
> |9|1350|1350|61939|1,032.2|301|799|0|61939|100%|
> |9|1450|1450|67920|1,131.9|276|844|0|67920|100%|
> |9|1550|1550|73151|1,219.1|261|861|0|73151|100%|
> |9|1650|1650|73937|1,232.2|332|955|0|73937|100%|
> |9|1750|1750|73516|1,225.2|423|1046|0|73516|100%|
> |9|1850|1850|72556|1,209.1|515|1264|0|72556|100%|
> |9|1950|1911|78613|1,310.1|454|50273|0|78613|100%|
> |9|2050|1911|80141|1,335.6|431|1225|39|80102|99%|
> |9|2150|1911|76979|1,282.9|490|1338|127|76852|99%|
> |9|2250|1911|78048|1,300.7|464|1305|136|77912|99%|
> h3. 9 workers, 1 context
> ||Nodes||Sessions||Ses.Active||Samples||samples/s||mean resp. ms||max resp. ms||conn. errors||valid samples||%||
> |9|150|150|8965|149.4|2|12|0|8965|100%|
> |9|250|250|14965|249.4|2|22|0|14965|100%|
> |9|350|350|20950|349.1|2|23|0|20950|100%|
> |9|450|450|26941|449.0|2|26|0|26941|100%|
> |9|550|550|32937|548.9|1|26|0|32937|100%|
> |9|650|650|38900|648.3|1|19|0|38900|100%|
> |9|750|750|44918|748.6|1|11|0|44918|100%|
> |9|850|850|50902|848.3|2|22|0|50902|100%|
> |9|950|950|56878|947.9|1|14|0|56878|100%|
> |9|1050|1050|62874|1,047.8|2|12|0|62874|100%|
> |9|1150|1150|68845|1,147.3|2|99|0|68845|100%|
> |9|1250|1250|74851|1,247.4|2|103|0|74851|100%|
> |9|1350|1350|80826|1,347.0|2|100|0|80826|100%|
> |9|1450|1450|86806|1,446.7|2|19|0|86806|100%|
> |9|1550|1550|92817|1,546.8|2|52|0|92817|100%|
> |9|1650|1650|98774|1,646.1|2|18|0|98774|100%|
> |9|1750|1750|104755|1,745.8|2|18|0|104755|100%|
> |9|1850|1850|110734|1,845.4|2|20|0|110734|100%|
> |9|1950|1910|113419|1,890.2|9|41855|0|113419|100%|
> |9|2050|1911|114437|1,907.1|2|77962|39|114397|99%|
> |9|2150|1911|114481|1,907.9|2|15|128|114353|99%|
> |9|2250|1911|114545|1,908.9|2|24|144|114401|99%|
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