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
shell$ ompi_info | grep debug
Internal debug support: no
Memory debugging support: no
You want to see "no" for both of those.