The real trouble with OpenMP and threading ends up being less about the
threads and more about whether or not anything is gained.

>From experience I've learned to keep a sequentially optimized version and
always test against that. Even if all cores are being used in the openMP
version there is a chance that bottlenecks slow it down enough to make the
sequential no slower.

-- 
Michael Hoffman
ROSE Compiler Group
Lawrence Livermore National Laboratories
Department of Energy
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