[jboss-user] [Performance Tuning] - FullGC at start-up even before application deployment?

Mostafa ElShafei do-not-reply at jboss.com
Wed Sep 21 05:02:52 EDT 2011

Mostafa ElShafei [http://community.jboss.org/people/elshafei.mostafa] created the discussion

"FullGC at start-up even before application deployment?"

To view the discussion, visit: http://community.jboss.org/message/627703#627703

I am performing tuning benchmarks on a web application that is running on JBoss AS4.2.
What I have noticed is that the GC log starts always with a full GC at the server start-up even before the application is deployed.
Can someone explain to me this behavior? There is plenty of free memory in the young, tenured and PermGen. Why is this happening??
FWIW, here is the GC log:
15.464: [Full GC [PSYoungGen: 44456K->0K(458752K)] [ParOldGen: 0K->4385K(1572864K)]
 44456K->4385K(2031616K) [PSPermGen: 11565K->11554K(262144K)], 0.9427300 secs]
 64.382: [GC [PSYoungGen: 393216K->30720K(458752K)] 397601K->35105K(2031616K), 0.1768945 secs]
 105.965: [GC [PSYoungGen: 423936K->38912K(458752K)] 428321K->43297K(2031616K), 0.4344201 secs]

Thanks in advance for any guidance.

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