JNI-performance - Is it really that fast?
linuxhippy at gmail.com
Wed Mar 26 23:46:23 UTC 2008
> No problem at all (:>).
> Is your pentium4 a uniprocessor? On uniprocessors HotSpot elides the
> lock: prefix when emitting the Intel cmpxchg (CAS) instruction. The
> lock prefix forces the cmpxchg to be serializing and greatly increases
> the latency but that's unnecessary on uniprocessors as they're always
> self-consistent. (Even multiple threads on a uniprocessor are always
> self-consistent with respect to the memory model).
Exactly, its a uniprocessor.
Thanks a lot for clarification and for your patience, suggestions and
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