[jboss-user] [Performance Tuning] - Re: Cpu 100% and GC is running

[sreenivas arumilli]

sreenivas arumilli [https://community.jboss.org/people/arumilli] created the discussion

"Re: Cpu 100% and GC is running"

To view the discussion, visit: https://community.jboss.org/message/647363#647363

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Hi,

I changed the JVM setting and able tp see the perfomance of my system was much improved. But still I am having 100% cpu usage with GC.

Our JVM permaters are :

-Dprogram.name=run.sh
-Dprogram.name=run.sh
-Xms3872m
-Xmx3872m
-Dsun.rmi.dgc.client.gcInterval=3600000
-Dsun.rmi.dgc.server.gcInterval=3600000
-XX:NewSize=1278m
-XX:MaxNewSize=1278m
-Djava.net.preferIPv4Stack=true
-XX:MaxPermSize=256m
-XX:+UseConcMarkSweepGC
-XX:+CMSClassUnloadingEnabled
-Djavax.net.ssl.trustStore=/opt/properties/.keystore
-Djavax.net.ssl.trustStorePassword=changeit
-Dcom.sun.management.jmxremote.port=8888
-Djava.rmi.server.hostname=192.168.100.39
-Dcom.sun.management.jmxremote.ssl=false
-Dcom.sun.management.jmxremote
-XX:+PrintGCDetails
-Xloggc:/opt/gc.log
-XX:+UseTLAB
-XX:+UseParNewGC
-XX:ParallelGCThreads=4
-Xss256k
-Djava.net.preferIPv4Stack=true
-Djava.endorsed.dirs=/opt/jboss-4.2.3.GA//lib/endorsed

We observered GC logs and found the below lines are causing CPU 100% usage.

25074.643: [GC [1 CMS-initial-mark: 1349040K(2656256K)] 1350761K(3963712K), 0.0072300 secs]
25074.650: [CMS-concurrent-mark-start]
25075.310: [CMS-concurrent-mark: 0.659/0.659 secs]
25075.310: [CMS-concurrent-preclean-start]
25075.320: [CMS-concurrent-preclean: 0.010/0.010 secs]
25075.320: [CMS-concurrent-abortable-preclean-start]
 CMS: abort preclean due to time 25076.377: [CMS-concurrent-abortable-preclean: 0.175/1.057 secs]
25076.391: [GC[YG occupancy: 63977 K (1307456 K)]25076.391: [Rescan (parallel) , 0.1988790 secs]25076.589: [weak refs processing, 0.3584420 secs] [1 CMS-remark: 1349040K(2656256K)] 1413018K(3963712K), 0.5868910 secs]
25076.978: [CMS-concurrent-sweep-start]
25077.978: [CMS-concurrent-sweep: 1.000/1.000 secs]
25077.978: [CMS-concurrent-reset-start]
25077.986: [CMS-concurrent-reset: 0.008/0.008 secs]


Can you suggest why it getting aborted and what we need to do to prevent this.

Arumilli
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