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Re: Cpu 100% and GC is running
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created by <a href="https://community.jboss.org/people/arumilli">sreenivas arumilli</a> in <i>Performance Tuning</i> - <a href="https://community.jboss.org/message/647363#647363">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>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.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Our JVM permaters are :</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>-Dprogram.name=run.sh</p><p>-Dprogram.name=run.sh</p><p>-Xms3872m</p><p>-Xmx3872m</p><p>-Dsun.rmi.dgc.client.gcInterval=3600000</p><p>-Dsun.rmi.dgc.server.gcInterval=3600000</p><p>-XX:NewSize=1278m</p><p>-XX:MaxNewSize=1278m</p><p>-Djava.net.preferIPv4Stack=true</p><p>-XX:MaxPermSize=256m</p><p>-XX:+UseConcMarkSweepGC</p><p>-XX:+CMSClassUnloadingEnabled</p><p>-Djavax.net.ssl.trustStore=/opt/properties/.keystore</p><p>-Djavax.net.ssl.trustStorePassword=changeit</p><p>-Dcom.sun.management.jmxremote.port=8888</p><p>-Djava.rmi.server.hostname=192.168.100.39</p><p>-Dcom.sun.management.jmxremote.ssl=false</p><p>-Dcom.sun.management.jmxremote</p><p>-XX:+PrintGCDetails</p><p>-Xloggc:/opt/gc.log</p><p>-XX:+UseTLAB</p><p>-XX:+UseParNewGC</p><p>-XX:ParallelGCThreads=4</p><p>-Xss256k</p><p>-Djava.net.preferIPv4Stack=true</p><p>-Djava.endorsed.dirs=/opt/jboss-4.2.3.GA//lib/endorsed</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>We observered GC logs and found the below lines are causing CPU 100% usage.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>25074.643: [GC [1 CMS-initial-mark: 1349040K(2656256K)] 1350761K(3963712K), 0.0072300 secs]</p><p>25074.650: [CMS-concurrent-mark-start]</p><p>25075.310: [CMS-concurrent-mark: 0.659/0.659 secs]</p><p>25075.310: [CMS-concurrent-preclean-start]</p><p>25075.320: [CMS-concurrent-preclean: 0.010/0.010 secs]</p><p>25075.320: [CMS-concurrent-abortable-preclean-start]</p><p> CMS: abort preclean due to time 25076.377: [CMS-concurrent-abortable-preclean: 0.175/1.057 secs]</p><p>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]</p><p>25076.978: [CMS-concurrent-sweep-start]</p><p>25077.978: [CMS-concurrent-sweep: 1.000/1.000 secs]</p><p>25077.978: [CMS-concurrent-reset-start]</p><p>25077.986: [CMS-concurrent-reset: 0.008/0.008 secs]</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Can you suggest why it getting aborted and what we need to do to prevent this.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Arumilli</p></div>
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