On Thu, Oct 9, 2008 at 5:40 AM, Jeff Squyres
<jsquyres@cisco.com> wrote:
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.
shell$ ompi_info | grep debug
Internal debug support: no
Memory debugging support: no
shell$
Yes. It is "no"
$ /opt/ompi127/bin/ompi_info -all | grep debug
Internal debug support: no
Memory debugging support: no
I've tested GROMACS for a single process (mpirun -np 1):
Here are the results:
OpenMPI : 120m 6s
MPICH2 : 67m 44s
I'm trying to bulid the codes with PGI, but facing problem with compilation of GROMACS.
You want to see "no" for both of those.
--
Jeff Squyres
Cisco Systems