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Old 06-23-2011, 06:46 AM   #1
Registered: Feb 2009
Location: Goa(India)-Sharjah(UAE)
Distribution: RHEL,centos,fedora,ubuntu
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memory tuning


I have upgraded my physical memory from 4GB to 16GB for linux server running on centos 4.7

Application server running is Jboss 4.2.3

I need to tune the Jboss to utilize more memory my current setting in run.conf are as follows

JAVA_OPTS="-server -Xmx3072m -Xms3072m -Xss256k -XX:MaxPermSize=512m -XX:ParallelGCThreads=8 -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:SurvivorRatio=8 -XX:TargetSurvivorRatio=90 -XX:+AggressiveOpts -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000 -verbose:gc"

The above was the setting for 4Gb of memory now i ahve 16Gb
can someone help me in tuning to make the server efficient

I am new to Jboss tuning so am seeking assistance
Old 06-23-2011, 01:04 PM   #2
Registered: Nov 2008
Location: Lower Saxony, Germany
Distribution: CentOS, RHEL, Solaris 10, AIX, HP-UX
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parse all command line options by reading their exact documentation to understand. After that you will be able to unterstand what they all do and how they work. Also application server tuning depends heavily on use case, there can be different memory or cpu consumption, so there will be no cover-all answer.
Old 06-23-2011, 06:10 PM   #3
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Unless you are running 64 bit, I don't think that's going to help. iirc, a 32 bit user process can only use a max of 4gb (slightly under in fact), even if you run a PAE kernel so that the OS can use all your RAM.

From here you can see that RHEL 4.x is going out of regular support relatively soon
I believe latest is 4.9



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