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Subject: [OMPI users] Performance: MPICH2 vs OpenMPI
From: Sangamesh B (forum.san_at_[hidden])
Date: 2008-10-08 09:10:03

Hi All,

       I wanted to switch from mpich2/mvapich2 to OpenMPI, as OpenMPI
supports both ethernet and infiniband. Before doing that I tested an
application 'GROMACS' to compare the performance of MPICH2 & OpenMPI. Both
have been compiled with GNU compilers.

After this benchmark, I came to know that OpenMPI is slower than MPICH2.

This benchmark is run on a AMD dual core, dual opteron processor. Both have
compiled with default configurations.

The job is run on 2 nodes - 8 cores.

OpenMPI - 25 m 39 s.
MPICH2 - 15 m 53 s.

Any comments ..?