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From "Smith, Mitchell" <mitchell.sm...@cwc.com>
Subject Concurrent Low Pause GC - Eden Space Size (Apache Tomcat/5.5.27)
Date Fri, 10 Jun 2011 15:05:48 GMT
Hi,

Tomcat Version 5.5.27
OS: Linux Red Hat Linux 5.3 Enterprise 64bit

I have a tomcat server setup, with the following configuration added:
    -XX:+UseLargePages
    -Xms14336m
    -Xmx14336m
    -XX:NewRatio=4
    -XX:MaxPermSize=256m
    -XX:+UseConcMarkSweepGC
    -XX:CMSInitiatingOccupancyFraction=51
    -XX:+CMSIncrementalMode
    -XX:+CMSIncrementalPacing
    -XX:CMSIncrementalDutyCycle=75
    -XX:CMSIncrementalDutyCycleMin=20
    -XX:CMSIncrementalSafetyFactor=10
    -XX:CMSIncrementalOffset=0
    -XX:CMSExpAvgFactor=25

When I check the JVM output via jConsole the Eden space only has an
available max space of 10496kbytes, I believe that my configuration of
-(XX:NewRatio=4) should effectively set this parameter to 20% of the
total available heap (-Xmx14336m) - should be approx 2936000kbytes.

This problem, creates an issue that the Eden space GC runs frequently,
and the time available between these minor GC's is to short for the
Tenured space to be effectively collected.

Any Help or suggestions would be greatly appreciated.

Thank You,
--
Mitchell Smith
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