Open MPI logo

Open MPI User's Mailing List Archives

  |   Home   |   Support   |   FAQ   |  

This web mail archive is frozen.

This page is part of a frozen web archive of this mailing list.

You can still navigate around this archive, but know that no new mails have been added to it since July of 2016.

Click here to be taken to the new web archives of this list; it includes all the mails that are in this frozen archive plus all new mails that have been sent to the list since it was migrated to the new archives.

Subject: Re: [OMPI users] Performance: MPICH2 vs OpenMPI
From: Ray Muno (muno_at_[hidden])
Date: 2008-10-08 09:25:52

I would be interested in what others have to say about this as well.

We have been doing a bit of performance testing since we are deploying a
new cluster and it is our first InfiniBand based set up.

In our experience, so far, OpenMPI is coming out faster than MVAPICH.
Comparisons were made with different compilers, PGI and Pathscale. We do
not have a running implementation of OpenMPI with SunStudio compilers.

Our tests were with actual user codes running on up to 600 processors so

Sangamesh B wrote:
> 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 ..?
> Thanks,
> Sangamesh

-Ray Muno
 Aerospace Engineering.