Re: CMS Collector Having Random Fits

From: walbauer (wb_at_coware.de)
Date: 09/28/04 

Date: Tue, 28 Sep 2004 08:27:28 -0400

We experienced some similar behaviour and I would like to know, if the
solution we found is indeed solving this problem. Below you find our
setup.

I think UseCMSInitiatingOccupancyOnly was the trick, but really didn't
want to try every combination.

Best regards,
Walter

# ---------------------------------
# Set JVM Options
# ---------------------------------
OPTIONS="-Xms256m -Xmx256m -server"

#OPTIONS="$OPTIONS -verbose:gc"
OPTIONS="$OPTIONS -Xloggc:logs/gc.log"
OPTIONS="$OPTIONS -XX:+PrintGCTimeStamps"
OPTIONS="$OPTIONS -XX:+PrintGCDetails"
OPTIONS="$OPTIONS -XX:+PrintGCApplicationStoppedTime"
#OPTIONS="$OPTIONS -XX:+PrintHeapAtGC"
#OPTIONS="$OPTIONS -XX:+PrintTenuringDistribution"

#OPTIONS="$OPTIONS -XX:+PrintCompilation"
#OPTIONS="$OPTIONS -XX:+TraceClassLoading"
#OPTIONS="$OPTIONS -XX:+TraceClassUnloading"

#OPTIONS="$OPTIONS -XX:NewRatio=2"
OPTIONS="$OPTIONS -XX:NewSize=32M"
OPTIONS="$OPTIONS -XX:MaxNewSize=32M"
OPTIONS="$OPTIONS -XX:PermSize=64M"
OPTIONS="$OPTIONS -XX:MaxPermSize=64M"

#OPTIONS="$OPTIONS -XX:TargetSurvivorRatio=50"
OPTIONS="$OPTIONS -XX:SurvivorRatio=1024"
OPTIONS="$OPTIONS -XX:MaxTenuringThreshold=0"

#OPTIONS="$OPTIONS -XX:+DisableExplicitGC"
OPTIONS="$OPTIONS -XX:+UseParNewGC"
OPTIONS="$OPTIONS -XX:+UseConcMarkSweepGC"
OPTIONS="$OPTIONS -XX:+CMSParallelRemarkEnabled"
OPTIONS="$OPTIONS -XX:+CMSPermGenSweepingEnabled"
OPTIONS="$OPTIONS -XX:+CMSClassUnloadingEnabled"
OPTIONS="$OPTIONS -XX:+UseCMSCompactAtFullCollection"
OPTIONS="$OPTIONS -XX:CMSFullGCsBeforeCompaction=0"
OPTIONS="$OPTIONS -XX:CMSInitiatingOccupancyFraction=60"
OPTIONS="$OPTIONS -XX:+UseCMSInitiatingOccupancyOnly"

OPTIONS="$OPTIONS -XX:-UseTLAB"
#OPTIONS="$OPTIONS -XX:SoftRefLRUPolicyMSPerMB=1000"

PROPERTIES="$PROPERTIES -Dsun.rmi.dgc.server.gcInterval=3600000"
PROPERTIES="$PROPERTIES -Dsun.rmi.dgc.client.gcInterval=3600000"

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