[Wrf-users] OpenMPI vs MPICH2

Don Morton Don.Morton at alaska.edu
Wed Mar 16 19:15:38 MDT 2011

Bart, we missed you at the Alaska Weather Symposium this year!

The only comment I'll offer is that we were running WRF dmpar using MPICH2
on a Sun Opteron system:


compiled with PGI and on large problems, especially those with nests, we
found intermittent "hang" problems with the scatterv operation of the LBC's
to the tasks.   On certain domains, the hang would inevitably occur, but not
always at the same time.  Since we've moved to OpenMPI we haven't had the
issue.  Other users on this system have experienced the same.



On Wed, Mar 16, 2011 at 11:04 AM, Bart Brashers
<bbrashers at environcorp.com>wrote:

> Has anyone done any benchmark testing of WRF dmpar using OpenMPI vs.
> MPICH2?  Which one is "better" or "faster"?
> Bart
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