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Subject: Re: [OMPI users] Performance: MPICH2 vs OpenMPI
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2008-10-09 10:13:28

On Oct 9, 2008, at 8:06 AM, Sangamesh B wrote:

> I've tested GROMACS for a single process (mpirun -np 1):
> Here are the results:
> OpenMPI : 120m 6s
> MPICH2 : 67m 44s

That seems to indicate that something else is going on -- with -np 1,
there should be no MPI communication, right? I wonder if the memory
allocator performance is coming into play here.

Try re-configuring/re-building Open MPI with --without-memory-manager.

Jeff Squyres
Cisco Systems