[jboss-user] [Installation, Configuration & DEPLOYMENT] - Re: Jboss memory settings on 64 bit server

PeterJ do-not-reply at jboss.com
Fri Jun 5 13:09:47 EDT 2009

Do you really needs 16GB of heap? Have you done any performance testing to see what the actual memory requirements are? Cleaning up a 16GB heap, or even a 1GB young generation, will take time. And using the CMS collector will not reduce the young generation pauses. The CMS collector does pause the app twice for object marking; I have no idea how long it will take to mark a 16 GB heap.

Ideally, you want the smallest heap possible that does not greatly negatively impact your performance.  In this case I think you have run into the "more is not better" anti-pattern.

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