[Beowulf] Shared memory

Håkon Bugge Hakon.Bugge at scali.com
Mon Jul 4 04:49:46 EDT 2005


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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