[JBoss JIRA] (MODCLUSTER-372) Number of registered contexts negatively affects mod_cluster performance
by RH Bugzilla Integration (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-372?page=com.atlassian.jira.pl... ]
RH Bugzilla Integration updated MODCLUSTER-372:
-----------------------------------------------
Bugzilla Update: Perform
Bugzilla References: https://bugzilla.redhat.com/show_bug.cgi?id=1030965, https://bugzilla.redhat.com/show_bug.cgi?id=1079156, https://bugzilla.redhat.com/show_bug.cgi?id=1084882 (was: https://bugzilla.redhat.com/show_bug.cgi?id=1030965, https://bugzilla.redhat.com/show_bug.cgi?id=1079156)
> 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: Jean-Frederic Clere
> Labels: mod_cluster, performace
> Fix For: 1.3.0.Final, 1.2.8.Final
>
> 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, callgrind.zip, httpd.conf, performance-chart-1.2.8-flags.png, performance-chart-BZ1079156.png, performance-test-httpd.conf, performance-test-mod_cluster.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.
> 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.
> [^httpd.conf] attached, stay tuned for some profiler outputs...
> 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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10 years, 8 months
- 1
- 0
[JBoss JIRA] (MODCLUSTER-365) Reset MCMPs are sent to all available proxies
by RH Bugzilla Integration (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-365?page=com.atlassian.jira.pl... ]
RH Bugzilla Integration commented on MODCLUSTER-365:
----------------------------------------------------
Vaclav Tunka <vtunka(a)redhat.com> changed the Status of [bug 1050223|https://bugzilla.redhat.com/show_bug.cgi?id=1050223] from ASSIGNED to ON_QA
> Reset MCMPs are sent to all available proxies
> ---------------------------------------------
>
> Key: MODCLUSTER-365
> URL: https://issues.jboss.org/browse/MODCLUSTER-365
> Project: mod_cluster
> Issue Type: Bug
> Affects Versions: 1.2.6.Final
> Environment: -JBoss Enterprise Application Platform (EAP) 6.1.1
> Reporter: Aaron Ogburn
> Assignee: Jean-Frederic Clere
> Labels: mod_cluster
> Fix For: 1.2.7.Final, 1.3.0.Final
>
>
> Consider a JBoss server with multiple httpd servers defined in its proxy-list. If one of those httpd servers goes down and then comes back up, then reset MCMPs (CONFIG, ENABLE-APP) would be sent to the restarted httpd proxy but needlessly to all other proxies as well. This is because DefaultMCMPHandler.status just calls sendRequests, which will send to all proxies by design.
> This has negative implications if auto-enable-contexts is set to false and can break desired behavior. Reproducer steps detail the issue introduced in that scenario.
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10 years, 8 months
- 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:
--------------------------------------
Attachment: performance-chart-1.2.8-flags.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: Jean-Frederic Clere
> Labels: mod_cluster, performace
> Fix For: 1.3.0.Final, 1.2.8.Final
>
> 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, callgrind.zip, httpd.conf, performance-chart-1.2.8-flags.png, performance-chart-BZ1079156.png, performance-test-httpd.conf, performance-test-mod_cluster.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.
> 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.
> [^httpd.conf] attached, stay tuned for some profiler outputs...
> 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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10 years, 8 months
- 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 commented on MODCLUSTER-372:
-------------------------------------------
h3. Note on compile flags
Note the performance improvement between m_c1.2.8.Final, compiled without any specific flags and m_c1.2.8.Final with -O3.
||natives||sessions||mean response time, {{ms}}||throughput, {{samples/s}}||CPU load, {{%}}||
|*m_c1.2.8.Final -O3*|2000|921|1071|24|
|m_c1.2.8.Final|2000|1224|903.9|40|
|m_c1.2.6.Final|2000|1182|901.4|85|
|m_c1.2.4.Final|2000|1223|898.3|85|
|m_c1.2.x HEAD:1d1512f|2000|1221|906.8|85|
|m_c1.2.x HEAD:6838624|2000|417|1477|33|
|m_c1.3.1 HEAD:88040c3|2000|1572|781.6|34|
|mod_jk/1.2.37|2000|651|1237.9|9|
||natives||sessions||mean response time, {{ms}}||throughput, {{samples/s}}||CPU load, {{%}}||
|*m_c1.2.8.Final -O3*|1700|191|1299.4|25|
|m_c1.2.8.Final|1700|383|1222|46|
|m_c1.2.6.Final|1700|899|895.4|85|
|m_c1.2.4.Final|1700|905|889|80|
|m_c1.2.x HEAD:1d1512f|1700|853|924.4|85|
|m_c1.2.x HEAD:6838624|1700|353|1203|23|
|m_c1.3.1 HEAD:88040c3|1700|259|1345.9|53|
|mod_jk/1.2.37|1700|16|1672.9|10|
!performance-chart-1.2.8-flags.png!
h3. Configuration
*Overview*
* 5 bare metal EAP workers
* 1 bare metal Apache HTTP Server with mod_cluster as a load balancer
* 4 bare metal machines generating load
* all boxes: quad-core AMD Opteron(tm) Processor 2220 SE, 8GB RAM
*Network*
* 1000 Mbps, full duplex, no other traffic during the test
*Test*
* each worker has 61 contexts deployed
* load drivers access these contexts
* an increasing number of active sessions (active clients) is kept
* each active client makes 1 request a second
*Apache HTTP Server configuration*
* [^performance-test-httpd.conf]
* [^performance-test-mod_cluster.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: Jean-Frederic Clere
> Labels: mod_cluster, performace
> Fix For: 1.3.0.Final, 1.2.8.Final
>
> 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, callgrind.zip, httpd.conf, performance-chart-1.2.8-flags.png, performance-chart-BZ1079156.png, performance-test-httpd.conf, performance-test-mod_cluster.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.
> 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.
> [^httpd.conf] attached, stay tuned for some profiler outputs...
> 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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10 years, 8 months
- 1
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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: performance-test-mod_cluster.conf
performance-test-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: Jean-Frederic Clere
> Labels: mod_cluster, performace
> Fix For: 1.3.0.Final, 1.2.8.Final
>
> 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, callgrind.zip, httpd.conf, performance-chart-BZ1079156.png, performance-test-httpd.conf, performance-test-mod_cluster.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.
> 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.
> [^httpd.conf] attached, stay tuned for some profiler outputs...
> 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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10 years, 8 months
- 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:
--------------------------------------
Attachment: performance-chart-BZ1079156.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: Jean-Frederic Clere
> Labels: mod_cluster, performace
> Fix For: 1.3.0.Final, 1.2.8.Final
>
> 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, callgrind.zip, httpd.conf, performance-chart-BZ1079156.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.
> 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.
> [^httpd.conf] attached, stay tuned for some profiler outputs...
> 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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10 years, 8 months
- 1
- 0
[JBoss JIRA] (MODCLUSTER-399) Draining pending requests fails with Oracle JDK8
by Michal Babacek (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-399?page=com.atlassian.jira.pl... ]
Michal Babacek updated MODCLUSTER-399:
--------------------------------------
Bugzilla Update: (was: Perform)
> Draining pending requests fails with Oracle JDK8
> ------------------------------------------------
>
> Key: MODCLUSTER-399
> URL: https://issues.jboss.org/browse/MODCLUSTER-399
> Project: mod_cluster
> Issue Type: Bug
> Affects Versions: 1.2.8.Final
> Environment: RHEL7 x86_64, Apache/2.2.26 (Red Hat Enterprise Web Server), Oracle JDK 8
> Reporter: Michal Babacek
> Assignee: Radoslav Husar
> Attachments: 1-access_log.zip, 1-error_log.zip, 1-server.log, 2-access_log.zip, 2-error_log.zip, 2-server.log, 3-access_log.zip, 3-error_log.zip, 3-server.log, 4-access_log.zip, 4-error_log.zip, 4-server.log, 5-access_log.zip, 5-error_log.zip, 5-server.log
>
>
> I've noticed several tests that run O.K. with Oracle JDK7 and fail with Oracle JDK8. One can reproduce these failures anytime, they are not just random glitches.
> Notes on the setup:
> * {{simplecontext-666}} is a simple JSP web app, non-distributable
> * {{clusterbench}} is a distributable webapp
> * all the tests use 1 worker node and 1 balancer
> * many clients throwing many requests at the {{simplecontext-666}} context
> h3. Stop Context Timeout test
> First, there is the setup with {{stop-context-timeout="20"}}:
> {code}
> <subsystem xmlns="urn:jboss:domain:modcluster:1.2">
> <mod-cluster-config advertise-socket="modcluster" stop-context-timeout="20" connector="ajp">
> <dynamic-load-provider>
> <load-metric type="busyness"/>
> </dynamic-load-provider>
> </mod-cluster-config>
> </subsystem>
> {code}
> On *JDK7*, one may observe exactly the desired behavior. On a clean shutdown, message {{Failed to drain 294 remaining pending requests from default-host:/simplecontext-666 within 20.0 seconds}} is displayed. See the whole log here: [^1-server.log].
> {noformat}
> [org.jboss.web] (ServerService Thread Pool -- 22) JBAS018224: Unregister web context: /simplecontext-666
> [org.jboss.as.server.deployment] (MSC service thread 1-8) JBAS015877: Stopped deployment simplecontext-666.war (runtime-name: simplecontext-666.war) in 284ms
> [org.jboss.modcluster] (ServerService Thread Pool -- 9) MODCLUSTER000024: All active sessions drained from default-host:/simplecontext-666 in 20.0 seconds
> [org.jboss.modcluster] (ServerService Thread Pool -- 9) MODCLUSTER000022: Failed to drain 294 remaining pending requests from default-host:/simplecontext-666 within 20.0 seconds
> [org.jboss.modcluster] (ServerService Thread Pool -- 9) MODCLUSTER000002: Initiating mod_cluster shutdown
> [org.apache.coyote.ajp] (MSC service thread 1-8) JBWEB003048: Pausing Coyote AJP/1.3 on ajp-/10.16.88.17:8009
> [org.apache.coyote.ajp] (MSC service thread 1-8) JBWEB003051: Stopping Coyote AJP/1.3 on ajp-/10.16.88.17:8009
> [org.jboss.as] (MSC service thread 1-11) JBAS015950: JBoss EAP 6.3.0.Alpha2 (AS 7.4.0.Final-redhat-6) stopped in 20035ms
> {noformat}
> On the other hand, with *JDK8*, this utterly fails. No waiting for pending requests, no message. See the whole log here: [^2-server.log].
> {noformat}
> [org.jboss.web] (ServerService Thread Pool -- 18) JBAS018224: Unregister web context: /simplecontext-666
> [org.apache.tomcat.util] (http-/10.16.88.17:8080-Acceptor) JBWEB003022: Channel processing failed
> [org.jboss.modcluster] (ServerService Thread Pool -- 16) MODCLUSTER000002: Initiating mod_cluster shutdown
> [org.apache.coyote.ajp] (MSC service thread 1-13) JBWEB003048: Pausing Coyote AJP/1.3 on ajp-/10.16.88.17:8009
> [org.apache.coyote.ajp] (MSC service thread 1-13) JBWEB003051: Stopping Coyote AJP/1.3 on ajp-/10.16.88.17:8009
> [org.jboss.as.server.deployment] (MSC service thread 1-10) JBAS015877: Stopped deployment simplecontext-666.war (runtime-name: simplecontext-666.war) in 310ms
> [org.jboss.as] (MSC service thread 1-2) JBAS015950: JBoss EAP 6.3.0.Alpha2 (AS 7.4.0.Final-redhat-6) stopped in 348ms
> {noformat}
> These are the Apache HTTP Server logs, showing exactly what was the test doing:
> Note that thousands of {{"GET /simplecontext-666/ HTTP/1.1"}} messages were omitted from these snippets.
> *JDK7*, access_log, (See the complete log here [^1-access_log.zip])
> {noformat}
> [06:47:04] "GET /mcm HTTP/1.1" 200 446 "-" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)"
> [06:47:12] "INFO / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [06:47:12] "CONFIG / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [06:47:12] "ENABLE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [06:47:12] "ENABLE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [06:47:12] "STATUS / HTTP/1.1" 200 60 "-" "ClusterListener/1.0"
> [06:47:13] "GET /mcm HTTP/1.1" 200 1916 "-" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)"
> [06:47:19] "DISABLE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [06:47:19] "DISABLE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [06:47:20] "STOP-APP / HTTP/1.1" 200 84 "-" "ClusterListener/1.0"
> [06:47:40] "STOP-APP / HTTP/1.1" 200 86 "-" "ClusterListener/1.0"
> [06:47:40] "REMOVE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [06:47:40] "REMOVE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [06:47:40] "REMOVE-APP /* HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> {noformat}
> *JDK8*, access_log, (See the complete log here [^2-access_log.zip])
> {noformat}
> [06:43:10] "GET /mcm HTTP/1.1" 200 446 "-" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)"
> [06:43:17] "INFO / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [06:43:17] "CONFIG / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [06:43:17] "ENABLE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [06:43:17] "ENABLE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [06:43:17] "STATUS / HTTP/1.1" 200 62 "-" "ClusterListener/1.0"
> [06:43:19] "GET /mcm HTTP/1.1" 200 1916 "-" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)"
> [06:43:25] "DISABLE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [06:43:25] "STOP-APP / HTTP/1.1" 200 84 "-" "ClusterListener/1.0"
> [06:43:25] "REMOVE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [06:43:25] "REMOVE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [06:43:25] "REMOVE-APP /* HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> {noformat}
> In the aforementioned snippets, it is noteworthy that the *JDK8* run sent only one {{STOP-APP}} message. This is confirmed in error logs:
> *JDK7*, error_log, {{grep STOP-APP}} (See the complete log here [^1-error_log.zip])
> {noformat}
> [06:47:20] mod_manager.c(1901): manager_trans STOP-APP (/)
> [06:47:20] mod_manager.c(2617): manager_handler STOP-APP (/) processing: "JVMRoute=jboss-eap-6.3&Alias=default-host%2Clocalhost%2Cexample.com&Context=%2Fclusterbench"
> [06:47:20] mod_manager.c(1429): process_appl_cmd: STOP-APP nbrequests 0
> [06:47:20] mod_manager.c(2666): manager_handler STOP-APP OK
> [06:47:40] mod_manager.c(1901): manager_trans STOP-APP (/)
> [06:47:40] mod_manager.c(2617): manager_handler STOP-APP (/) processing: "JVMRoute=jboss-eap-6.3&Alias=default-host%2Clocalhost%2Cexample.com&Context=%2Fsimplecontext-666"
> [06:47:40] mod_manager.c(1429): process_appl_cmd: STOP-APP nbrequests 294
> [06:47:40] mod_manager.c(2666): manager_handler STOP-APP OK
> {noformat}
> *JDK8*, error_log, {{grep STOP-APP}} (See the complete log here [^2-error_log.zip])
> {noformat}
> [06:43:25] mod_manager.c(1901): manager_trans STOP-APP (/)
> [06:43:25] mod_manager.c(2617): manager_handler STOP-APP (/) processing: "JVMRoute=jboss-eap-6.3&Alias=default-host%2Clocalhost%2Cexample.com&Context=%2Fclusterbench"
> [06:43:25] mod_manager.c(1429): process_appl_cmd: STOP-APP nbrequests 0
> [06:43:25] mod_manager.c(2666): manager_handler STOP-APP OK
> {noformat}
> One could argue that there was a test error and the *JDK8* test run actually didn't access {{simplecontext-666}} application. Let me dissolve this argument right away:
> {noformat}
> grep -c "GET /simplecontext-666/ HTTP/1.1\" 200" ./targetJDK8/httpd/logs/access_log
> 27250
> grep -c "GET /simplecontext-666/ HTTP/1.1\" 200" ./targetJDK7/httpd/logs/access_log
> 27927
> {noformat}
> h3. Default settings, the same problem...
> Trial with the default settings reveals the same problem with some additional findings in the Apache's error log.
> {code}
> <subsystem xmlns="urn:jboss:domain:modcluster:1.2">
> <mod-cluster-config advertise-socket="modcluster" connector="ajp">
> <dynamic-load-provider>
> <load-metric type="busyness"/>
> </dynamic-load-provider>
> </mod-cluster-config>
> </subsystem>
> {code}
> On *JDK7*, one may observe exactly the desired behavior, this time with the default 10 seconds timeout. See the whole log here: [^3-server.log].
> {noformat}
> [org.jboss.web] (ServerService Thread Pool -- 3) JBAS018224: Unregister web context: /simplecontext-666
> [org.jboss.as.server.deployment] (MSC service thread 1-6) JBAS015877: Stopped deployment simplecontext-666.war (runtime-name: simplecontext-666.war) in 263ms
> [org.jboss.modcluster] (ServerService Thread Pool -- 7) MODCLUSTER000024: All active sessions drained from default-host:/simplecontext-666 in 10.0 seconds
> [org.jboss.modcluster] (ServerService Thread Pool -- 7) MODCLUSTER000022: Failed to drain 340 remaining pending requests from default-host:/simplecontext-666 within 10.0 seconds
> [org.jboss.modcluster] (ServerService Thread Pool -- 7) MODCLUSTER000002: Initiating mod_cluster shutdown
> [org.apache.coyote.ajp] (MSC service thread 1-13) JBWEB003048: Pausing Coyote AJP/1.3 on ajp-/10.16.88.17:8009
> [org.apache.coyote.ajp] (MSC service thread 1-13) JBWEB003051: Stopping Coyote AJP/1.3 on ajp-/10.16.88.17:8009
> [org.jboss.as] (MSC service thread 1-9) JBAS015950: JBoss EAP 6.3.0.Alpha2 (AS 7.4.0.Final-redhat-6) stopped in 10082ms
> {noformat}
> *JDK8* fails. No waiting for pending requests, no message. This time even with ISE :(. See the whole log here: [^4-server.log].
> {noformat}
> [org.jboss.web] (ServerService Thread Pool -- 16) JBAS018224: Unregister web context: /simplecontext-666
> [org.jboss.modcluster] (ServerService Thread Pool -- 19) MODCLUSTER000021: All pending requests drained from default-host:/clusterbench in 0.0 seconds
> [org.jboss.as.txn] (ajp-/10.16.88.17:8009-21) JBAS010151: Unable to get transaction state: java.lang.IllegalStateException
> at org.jboss.msc.value.InjectedValue.getValue(InjectedValue.java:47)
> at org.jboss.as.txn.deployment.TransactionRollbackSetupAction.checkTransactionStatus(TransactionRollbackSetupAction.java:112)
> at org.jboss.as.txn.deployment.TransactionRollbackSetupAction.teardown(TransactionRollbackSetupAction.java:66)
> at org.jboss.as.web.ThreadSetupBindingListener.unbind(ThreadSetupBindingListener.java:61) [jboss-as-web-7.4.0.Final-redhat-6.jar:7.4.0.Final-redhat-6]
> at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:184) [jbossweb-7.4.0.Final.jar:7.4.0.Final]
> at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) [jbossweb-7.4.0.Final.jar:7.4.0.Final]
> at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) [jbossweb-7.4.0.Final.jar:7.4.0.Final]
> at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:340) [jbossweb-7.4.0.Final.jar:7.4.0.Final]
> at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:490) [jbossweb-7.4.0.Final.jar:7.4.0.Final]
> at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:420) [jbossweb-7.4.0.Final.jar:7.4.0.Final]
> at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:926) [jbossweb-7.4.0.Final.jar:7.4.0.Final]
> at java.lang.Thread.run(Thread.java:744) [rt.jar:1.8.0]
> +++
> [org.jboss.as.server.deployment] (MSC service thread 1-6) JBAS015877: Stopped deployment simplecontext-666.war (runtime-name: simplecontext-666.war) in 301ms
> [org.jboss.as] (MSC service thread 1-15) JBAS015950: JBoss EAP 6.3.0.Alpha2 (AS 7.4.0.Final-redhat-6) stopped in 313ms
> {noformat}
> In the access logs, it is noteworthy that both {{clusterbench}} and {{simplecontext-666}} sent {{ENABLE-APP}}, but there was only one {{STOP-APP}} message. Furthermore, who and why used {{OPTIONS}} method?
> *JDK7*, access_log, (See the complete log here [^3-access_log.zip])
> Note that thousands of {{"GET /simplecontext-666/ HTTP/1.1"}} messages were omitted from these snippets.
> {noformat}
> [07:31:49] "GET /mcm HTTP/1.1" 200 446 "-" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)"
> [07:31:57] "INFO / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:31:57] "CONFIG / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:31:57] "ENABLE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:31:57] "ENABLE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:31:57] "STATUS / HTTP/1.1" 200 63 "-" "ClusterListener/1.0"
> [07:31:58] "GET /mcm HTTP/1.1" 200 1916 "-" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)"
> [07:32:05] "DISABLE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:32:14] "OPTIONS * HTTP/1.0" 200 - "-" "Apache/2.2.26 (Red Hat Enterprise Web Server) (internal dummy connection)"
> [07:32:15] "STOP-APP / HTTP/1.1" 200 86 "-" "ClusterListener/1.0"
> [07:32:15] "REMOVE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:32:15] "REMOVE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:32:15] "REMOVE-APP /* HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> {noformat}
> *JDK8*, access_log, (See the complete log here [^4-access_log.zip])
> {noformat}
> [07:29:25] "GET /mcm HTTP/1.1" 200 446 "-" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)"
> [07:29:32] "INFO / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:29:32] "CONFIG / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:29:32] "ENABLE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:29:32] "ENABLE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:29:32] "STATUS / HTTP/1.1" 200 63 "-" "ClusterListener/1.0"
> [07:29:34] "GET /mcm HTTP/1.1" 200 1916 "-" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)"
> [07:29:40] "DISABLE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:29:40] "STOP-APP / HTTP/1.1" 200 84 "-" "ClusterListener/1.0"
> [07:29:40] "REMOVE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:29:40] "REMOVE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:29:40] "REMOVE-APP /* HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:29:40] "OPTIONS * HTTP/1.0" 200 - "-" "Apache/2.2.26 (Red Hat Enterprise Web Server) (internal dummy connection)"
> {noformat}
> Error log shows what context was the {{STOP-APP}} message linked to:
> *JDK7*, error_log, {{grep STOP-APP}} (See the complete log here [^3-error_log.zip])
> {noformat}
> [07:32:15] mod_manager.c(1901): manager_trans STOP-APP (/)
> [07:32:15] mod_manager.c(2617): manager_handler STOP-APP (/) processing: "JVMRoute=jboss-eap-6.3&Alias=default-host%2Clocalhost%2Cexample.com&Context=%2Fsimplecontext-666"
> [07:32:15] mod_manager.c(1429): process_appl_cmd: STOP-APP nbrequests 340
> [07:32:15] mod_manager.c(2666): manager_handler STOP-APP OK
> {noformat}
> *JDK8*, error_log, {{grep STOP-APP}} (See the complete log here [^4-error_log.zip])
> {noformat}
> [07:29:40] mod_manager.c(1901): manager_trans STOP-APP (/)
> [07:29:40] mod_manager.c(2617): manager_handler STOP-APP (/) processing: "JVMRoute=jboss-eap-6.3&Alias=default-host%2Clocalhost%2Cexample.com&Context=%2Fclusterbench"
> [07:29:40] mod_manager.c(1429): process_appl_cmd: STOP-APP nbrequests 0
> [07:29:40] mod_manager.c(2666): manager_handler STOP-APP OK
> {noformat}
> h3. Default settings, again
> I had considered the {{JBAS010151: Unable to get transaction state: java.lang.IllegalStateException}} being probably an unrelated glitch, so I tried the default test run with *JDK8* again. Test failed, yet this time without any exception. Nothing has changed since the last run as far as environment and configuration are concerned.
> *JDK8* fails. No waiting for pending requests on {{/simplecontext-666}}. See the whole log here: [^5-server.log].
> {noformat}
> [org.jboss.web] (ServerService Thread Pool -- 16) JBAS018224: Unregister web context: /clusterbench
> [org.apache.catalina.core] (MSC service thread 1-6) JBWEB001079: Container org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/] has not been started
> [org.apache.coyote.http11.Http11NioProtocol] (MSC service thread 1-14) JBWEB003075: Coyote HTTP/1.1 pausing on: http-/10.16.88.17:8080
> [org.apache.coyote.http11.Http11NioProtocol] (MSC service thread 1-14) JBWEB003077: Coyote HTTP/1.1 stopping on : http-/10.16.88.17:8080
> [org.jboss.web] (ServerService Thread Pool -- 3) JBAS018224: Unregister web context: /simplecontext-666
> [org.jboss.as.connector.subsystems.datasources] (MSC service thread 1-15) JBAS010409: Unbound data source [java:jboss/datasources/ExampleDS]
> [org.jboss.modcluster] (ServerService Thread Pool -- 16) MODCLUSTER000021: All pending requests drained from default-host:/clusterbench in 0.1 seconds
> [org.jboss.modcluster] (ServerService Thread Pool -- 14) MODCLUSTER000021: All pending requests drained from default-host:/clusterbench in 0.1 seconds
> [org.jboss.modcluster] (ServerService Thread Pool -- 14) MODCLUSTER000002: Initiating mod_cluster shutdown
> [org.apache.coyote.ajp] (MSC service thread 1-1) JBWEB003048: Pausing Coyote AJP/1.3 on ajp-/10.16.88.17:8009
> [org.apache.coyote.ajp] (MSC service thread 1-1) JBWEB003051: Stopping Coyote AJP/1.3 on ajp-/10.16.88.17:8009
> [org.jboss.as.clustering.infinispan] (ServerService Thread Pool -- 9) JBAS010282: Stopped repl cache from web container
> [org.jboss.as.clustering.infinispan] (ServerService Thread Pool -- 16) JBAS010282: Stopped default-host/clusterbench cache from web container
> [org.jboss.as.server.deployment] (MSC service thread 1-13) JBAS015877: Stopped deployment simplecontext-666.war (runtime-name: simplecontext-666.war) in 306ms
> [org.jboss.as.server.deployment] (MSC service thread 1-5) JBAS015877: Stopped deployment clusterbench.war (runtime-name: clusterbench.war) in 310ms
> [org.jboss.as] (MSC service thread 1-16) JBAS015950: JBoss EAP 6.3.0.Alpha2 (AS 7.4.0.Final-redhat-6) stopped in 333ms
> {noformat}
> *JDK8*, access_log, (See the complete log here [^5-access_log.zip])
> {noformat}
> [07:45:25] "GET /mcm HTTP/1.1" 200 446 "-" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)"
> [07:45:33] "INFO / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:45:33] "CONFIG / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:45:33] "ENABLE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:45:33] "ENABLE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:45:33] "STATUS / HTTP/1.1" 200 62 "-" "ClusterListener/1.0"
> [07:45:34] "GET /mcm HTTP/1.1" 200 1916 "-" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)"
> [07:45:39] "OPTIONS * HTTP/1.0" 200 - "-" "Apache/2.2.26 (Red Hat Enterprise Web Server) (internal dummy connection)"
> [07:45:40] "DISABLE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:45:40] "DISABLE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:45:40] "STOP-APP / HTTP/1.1" 200 84 "-" "ClusterListener/1.0"
> [07:45:40] "STOP-APP / HTTP/1.1" 200 84 "-" "ClusterListener/1.0"
> [07:45:40] "REMOVE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:45:40] "REMOVE-APP / HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:45:40] "REMOVE-APP /* HTTP/1.1" 200 - "-" "ClusterListener/1.0"
> [07:45:40] "OPTIONS * HTTP/1.0" 200 - "-" "Apache/2.2.26 (Red Hat Enterprise Web Server) (internal dummy connection)"
> [07:45:41] "OPTIONS * HTTP/1.0" 200 - "-" "Apache/2.2.26 (Red Hat Enterprise Web Server) (internal dummy connection)"
> {noformat}
> This time, there were two {{STOP-APP}} messages all right, but instead one of them being for {{clusterbench}} and the other one for {{simplecontext-666}}, they were both for {{clusterbench}}. I find this behavior being a rather disturbing one.
> *JDK8*, error_log, {{grep STOP-APP}} (See the complete log here [^5-error_log.zip])
> {noformat}
> [07:45:40] mod_manager.c(1901): manager_trans STOP-APP (/)
> [07:45:40] mod_manager.c(2617): manager_handler STOP-APP (/) processing: "JVMRoute=jboss-eap-6.3&Alias=default-host%2Clocalhost%2Cexample.com&Context=%2Fclusterbench"
> [07:45:40] mod_manager.c(1429): process_appl_cmd: STOP-APP nbrequests 0
> [07:45:40] mod_manager.c(2666): manager_handler STOP-APP OK
> [07:45:40] mod_manager.c(1901): manager_trans STOP-APP (/)
> [07:45:40] mod_manager.c(2617): manager_handler STOP-APP (/) processing: "JVMRoute=jboss-eap-6.3&Alias=default-host%2Clocalhost%2Cexample.com&Context=%2Fclusterbench"
> [07:45:40] mod_manager.c(1429): process_appl_cmd: STOP-APP nbrequests 0
> [07:45:40] mod_manager.c(2666): manager_handler STOP-APP OK
> {noformat}
> Again, there were plenty of requests sent to {{simplecontext-666/}}:
> {noformat}
> grep -c "GET /simplecontext-666/ HTTP/1.1\" 200" ./targetJDK8/httpd/logs/access_log
> 27587
> {noformat}
> WDYT?
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[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:
--------------------------------------
Comment: was deleted
(was: Michal Babacek <mbabacek(a)redhat.com> changed the Status of [bug 1030965|https://bugzilla.redhat.com/show_bug.cgi?id=1030965] from NEW to MODIFIED)
> 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: Jean-Frederic Clere
> Labels: mod_cluster, performace
> Fix For: 1.3.0.Final, 1.2.8.Final
>
> 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, callgrind.zip, 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.
> 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.
> [^httpd.conf] attached, stay tuned for some profiler outputs...
> 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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10 years, 8 months
- 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:
--------------------------------------
Comment: was deleted
(was: Paul Gier <pgier(a)redhat.com> changed the Status of [bug 1030965|https://bugzilla.redhat.com/show_bug.cgi?id=1030965] from MODIFIED to ON_QA)
> 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: Jean-Frederic Clere
> Labels: mod_cluster, performace
> Fix For: 1.3.0.Final, 1.2.8.Final
>
> 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, callgrind.zip, 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.
> 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.
> [^httpd.conf] attached, stay tuned for some profiler outputs...
> 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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10 years, 8 months
- 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:
--------------------------------------
Comment: was deleted
(was: Paul Gier <pgier(a)redhat.com> changed the Status of [bug 1030965|https://bugzilla.redhat.com/show_bug.cgi?id=1030965] from MODIFIED to ON_QA)
> 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: Jean-Frederic Clere
> Labels: mod_cluster, performace
> Fix For: 1.3.0.Final, 1.2.8.Final
>
> 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, callgrind.zip, 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.
> 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.
> [^httpd.conf] attached, stay tuned for some profiler outputs...
> 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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