[jboss-user] [Performance Tuning] - Physical vs Virtual Memory

ntnlljboss do-not-reply at jboss.com
Mon Apr 27 00:55:41 EDT 2009

Good morning,
i'm configuring JBoss 4.0.2 on Windows Server 2003 and i have a lot of problem concerning the memory managment. On this server are configured 10 VM for JBoss instances with this configuration:

-Xmn1024m -Xms1024m -Xmx1100m -XX:PermSize=512m -XX:MaxPermSize=512m -XX:+UseParallelGC

The server seem to allocate VM reserved XMX memory (1024MB*10) in the virtual memory instead on the physical memory. Only the MaxPermSize space (512*10) seem to be loaded in RAM, indeed, the related JBoss process use only 512MB of system physical memory. This results in an high swap file utilization, very low physical memory usage and in frequent OOME error. The paging usage peak is at 100% and the memory usage is always on 60% of 16GB avalaible.
I'm googling without find anything regarding. What's wrong?
Thanks in advance

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