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Subject: Re: [OMPI users] Performance: MPICH2 vs OpenMPI
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2008-10-08 20:10:48

On Oct 8, 2008, at 5:25 PM, Aurélien Bouteiller wrote:

> Make sure you don't use a "debug" build of Open MPI. If you use
> trunk, the build system detects it and turns on debug by default. It
> really kills performance. --disable-debug will remove all those
> nasty printfs from the critical path.

You can easily tell if you have a debug build of OMPI with the
ompi_info command:

shell$ ompi_info | grep debug
   Internal debug support: no
Memory debugging support: no

You want to see "no" for both of those.

Jeff Squyres
Cisco Systems