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MPI on a SMP multi-core machine

I'm trying out a dual quad-core Xeon EM64T machine in parallel with MPI
(etch). I ran into problems... I can run 5 processors, but not 6,7,8. The
machine slows down considerably. LAM-MPI and MPICH show exactly the same
behavior. Has anyone had similar problems when running MPI on a SMP
multi-core machine? Any solutions?

Ricardo Yanez

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