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Subject: Re: [OMPI users] Performance: MPICH2 vs OpenMPI
From: Sangamesh B (forum.san_at_[hidden])
Date: 2008-10-25 03:03:07


On Fri, Oct 24, 2008 at 11:26 PM, Eugene Loh <Eugene.Loh_at_[hidden]> wrote:
> 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?
No.
> OpenMPI - 25 m 39 s.
> MPICH2 - 15 m 53 s.

This job is run with 8 processes i.e. on 2 nodes.

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

This job is run with 4 processes i.e. on 1 node
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