3 Replies Latest reply on Dec 10, 2010 3:14 AM by jaikiran

memory footprint in JBoss 5.1.0 GA

jbossrmi123 Dec 6, 2010 3:04 PM

Hi all,

I have read a few discussions and JIRA entries discussing the JBoss 4.x versus JBoss 5.1.0 foot print increase. Some suggest upgrading JDK, and possibility of a JDK / VFS bug.

I have not found a clear answer to this issue anywhere so I was wondering if I can get some help / suggestions. Here are my observations:

I deploy a 'vanilla' JBoss (5.1.0 GA) web configuration in Linux and see the heap size from JConsole. It is in the tune of 80+ MB. I do a 'top' on the JVM process and see the residual memory usage is in the 350-400 MB ballpark. Understandable some of this might be getting used by the JVM / and or outside JBoss.

Note this is a 'as is' clean install JBoss without my application (to eliminate the possiblity of memory leak in my application). I try by evening stripping off more services from the Web configuration, but the footprint is still in the same ballpark.

My questions were:

1) Is this the expected memory footprint? Does 400-600 MB need to be alloted for each JBoss instance? (My xms, xmx are 128 and 1700) in a 32 bit JVM.

2) Which service in JBoss might be using the memory difference?

3) Is this related to VFS? is a solution in the works? Is a workaorund available? Will upgrading VFS from 2.1.2 help?

Thanks in advance for all suggestions.

1. Re: memory footprint in JBoss 5.1.0 GA

jaikiran Dec 6, 2010 10:53 PM (in response to jbossrmi123)

See Tuning section of this wiki http://community.jboss.org/wiki/jboss5xtuningslimming
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2. Re: memory footprint in JBoss 5.1.0 GA

jbossrmi123 Dec 8, 2010 9:31 AM (in response to jaikiran)

I had already used the tuning doc. I used the WEB configuration, but still removed all services other than tomcat and jndi based (and left jcs and transaction since I get error starting JBoss otherwise). I also commented out the annotation mentioned in the doc.
The impact is still not very much. I see a reduction of at the most 100mb out of 4-500mb.
What else could I possibly disabled or remove? is disabling VFS an option?
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3. Re: memory footprint in JBoss 5.1.0 GA

jaikiran Dec 10, 2010 3:14 AM (in response to jbossrmi123)

AS5 is known to consume more memory than AS4. Although some of it can be tuned (like you already did), there isn't much you can do other than that. Disabling VFS isn't an option. I can't recollect any other changes that you could do to optimize the memory usage.
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