[HTML]my CMS incremental duty cycle can't be controll by GC parameter settings

[Bond Chen]

Dear All & Sri,

Our application have encountered very long GC pause, from the GC analysis, I found the CMS takes 20-30 minutes to get finished by the value of icms_dc=1230 seconds, so the solution is to reduce this value, to let CMS finished ASAP, by reading a doc on oracle website about the CMS incremental mode, I want to have a concept demonstration test, but the result confusing me.

 

1)I have the set 3 CMS incremental parameters:
 -XX:+CMSIncrementalMode -XX:CMSIncrementalDutyCycleMin=0 -XX:CMSIncrementalDutyCycle=3 
 
   My expectation is:
     the icms_dc value in the gc log should be in range 0-3
 
   Actual results:
     the icms_dc value are out of the range


 
 
 
2)All vm options:
VM arguments: -Dprogram.name=run.sh -Xms6072M -Xmx6072M -XX:PermSize=512m -XX:MaxPermSize=512m -Xss1024k -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:+UseTLAB -XX:+CMSIncrementalMode -XX:ParallelGCThreads=6 -XX:CMSIncrementalDutyCycleMin=0 -XX:CMSIncrementalDutyCycle=3 -XX:MaxTenuringThreshold=32 -XX:+PrintTenuringDistribution -XX:CMSInitiatingOccupancyFraction=50 -Xmn1700m -XX:+UseLargePages -XX:LargePageSizeInBytes=64k -XX:+UseCMSInitiatingOccupancyOnly -XX:+PrintGCDetails -XX:+PrintGCApplicationStoppedTime -Xloggc:./gc_10_20120902171712.log -Dsun.rmi.dgc.server.gcInterval=18000000 -Dsun.rmi.dgc.client.gcInterval=18000000 -verbose:gc -Djava.library.path=/export/home/test/server/colline/cluster/jboss/server/2011.2.0.0.3/lib/valuation-lib:/export/home/test/server/colline/cluster/jboss/server/2011.2.0.0.3/firmament -Djava.endorsed.dirs=/export/home/test/server/colline/cluster/jboss/lib/endorsed -Djavax.management.builder.initial=org.jboss.system.server.jmx.MBeanServerBuilderImpl -Djboss.platform.mbeanserver -Dcom.sun.management.jmxremote.port=1234 -Dcom.sun.management.jmxremote.authenticate=false -XX:+ExplicitGCInvokesConcurrent -XX:+PrintTenuringDistribution -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps -XX:+PrintHeapAtGC -XX:+PrintPromotionFailure -XX:PrintFLSStatistics=2 -Djboss.cluster.number=4 -Djboss.cluster.monitor.switch=y -Djboss.messaging.groupname=MessagingPostOffice -Djboss.partition.name=UATPartition_RH -Djboss.messaging.serverpeerid=10 -Djboss.web.lb.nodeid=nodee -Djboss.home.dir=/export/home/test/server/colline/cluster/jboss -Djboss.profile.name=2011.2.0.0.3 -Djboss.cluster.node1.addr=172.20.30.8 -Djboss.cluster.node2.addr=172.20.30.11 -Djboss.cluster.node3.addr=172.20.30.16 -Djboss.cluster.node4.addr=172.20.30.10 -Djboss.cluster.port_hacluster=7800 -Djboss.cluster.port_jbmdata=7900 -Djboss.cluster.port_jbmcontrol=7910 -Djboss.cluster.port_invalidationcache=7920 -Djboss.cluster.port_replicationcache=7930 -Djboss.messaging.consumer_count=3 -Djboss.jndi.port=1099 -Djboss.hajndi.port=1100 -Dcollateral_config=/export/home/test/server/colline/cluster/bin/collateral.properties -DIGNORE_FQN=/marketdata/FxRates,/marketdata/EODFxRates -Ddatasource.min.pool.size=5 -Ddatasource.max.pool.size=150 -Djboss.partition.udpGroup=230.1.0.4 -Dcom.sun.management.jmxremote.port=5004 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Djavax.management.builder.initial=org.jboss.system.server.jmx.MBeanServerBuilderImpl -Djboss.platform.mbeanserver -Djava.endorsed.dirs=/export/home/test/server/colline/cluster/jboss/lib/endorsed 
 
 
 
3)GC logs:
-bash-3.00$ cat gc_10_20120902004701.log |grep icms
 icms_dc=0 , 0.1387250 secs] [Times: user=0.35 sys=0.20, real=0.14 secs] 
 icms_dc=0 , 0.3590387 secs] [Times: user=0.90 sys=0.43, real=0.36 secs] 
 icms_dc=15 , 0.5206302 secs] [Times: user=1.31 sys=0.46, real=0.52 secs] 
 icms_dc=30 , 0.2350382 secs] [Times: user=0.76 sys=0.01, real=0.24 secs] 
 icms_dc=45 , 0.4883827 secs] [Times: user=1.38 sys=0.37, real=0.49 secs] 
 icms_dc=41 , 0.7013340 secs] [Times: user=0.92 sys=0.05, real=0.70 secs] 
 
 
4)JVM version:
-bash-3.00$ java -version
java version "1.6.0_21"
Java(TM) SE Runtime Environment (build 1.6.0_21-b06)
Java HotSpot(TM) Server VM (build 17.0-b16, mixed mode)
-bash-3.00$ ./launch_bondGCParameter.sh 
 
Regards,
Bond


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