CMS Full GC

[Shivkumar Chelwa]

Hi,

Till date I was using JRE 6u22 with following garbage collection parameters and the CMS cycle use to kick-in appropriately (when heap reaches 75%)


-server -d64 -Xms2048m -Xmx2048m -javaagent: my-instrumentation.jar -XX:MaxPermSize=256m -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+DisableExplicitGC -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -verbose:gc -Xloggc:LB01.log -XX:+PrintGCTimeStamps -XX:+PrintGCDetails -Djava.library=/usr/java/jre/lib/sparcv9/server/libjvm.so -Xmx8192M -Xms8192M -Xss256K

But I switched to JRE 6u29 and see the CMS Full GC happening randomly. Can you please help me undercover this mystery. Here is one of the log message from gc log file.

13475.239: [Full GC 13475.239: [CMS: 4321575K->3717474K(7898752K), 54.0602376 secs] 4412277K->3717474K(8339648K), [CMS Perm : 73791K->73339K(74048K)], 54.0615557 secs] [Times: user=53.97 sy
s=0.12, real=54.06 secs]


Kindly help.


Regards,
Shiv



-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mail.openjdk.java.net/pipermail/hotspot-gc-use/attachments/20120417/5eb2f8ad/attachment.html