[Beowulf] Shared memory
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Håkon Bugge Hakon.Bugge at scali.comMon Jul 4 01:49:46 PDT 2005
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On Sun, 3 Jul 2005 20:12:10 -0700, Greg Lindahl wrote: > > Unfortunately I can't recommend a simple established code or benchmark > > which would allow transparent comparison of MPI versus OpenMP/MPI. > >MM5 runs both ways... and it's faster as pure MPI. If OpenMPI+MPI >doesn't have some special benefit such as accellerating convergence, >it's not going to be a win. > >-- greg Hmm, last time I measured I got ~20% speedup using OpenMP+MPI on MM5. Internode message exchange is less frequent and with larger messages; both a good thing for most clusters... -Hakon
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