Open MPI logo

Open MPI User's Mailing List Archives

  |   Home   |   Support   |   FAQ   |   all Open MPI User's mailing list

Subject: Re: [OMPI users] Performance: MPICH2 vs OpenMPI
From: Eugene Loh (Eugene.Loh_at_[hidden])
Date: 2008-10-24 13:56:24


Sangamesh B wrote:

> I reinstalled all softwares with -O3 optimization. Following are the
> performance numbers for a 4 process job on a single node:
>
> MPICH2: 26 m 54 s
> OpenMPI: 24 m 39 s

I'm not sure I'm following. OMPI is faster here, but is that a result
of MPICH2 slowing down? The original post at
http://www.open-mpi.org/community/lists/users/2008/10/6891.php had:

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

So, did MPICH2 slow down, or can one not compare these timings?