Monday, March 9, 2009

when does java heap expand, briefly

As advised in [[solaris 10 performance]] and numerous experts, better set -Xms and -Xmx identical, to avoid heap expansion, but what if we can't?

Expansion occurs if GC is unable to free enough heap storage for an allocation request, or if the JVM determines that expanding the heap is required for better performance.

I believe expansion can only happen after a full (but ineffective) GC.

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