Henrik S (henrik.stahl@nospam.oracle.nothanks.com) on 4/12/09 wrote:
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>It's JRockit with a J. Yes, you enable large pages with a -Xlargepages flag, which
>will use large pages both for JIT compiled code and the Java heap, to avoid ITLB
>and DLTB misses respectively. Java is susceptible to both of these issues; ITLB
>because many J2EE apps tend to have very big code bases and DLTB because of the random access nature of the Java heap.

Any try with Linux huge pages?

>Apart from that, we don't use the OS much for SPECjbb2005. Threads are mapped 1-to-1
>to OS threads, so thread scheduling matters a bit.

This one surprised me, I never profiled JBB, but always expected it to create/destroy a lot of threads.