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Subject: Re: [OMPI users] Performance: MPICH2 vs OpenMPI
From: Sangamesh B (forum.san_at_[hidden])
Date: 2008-10-25 03:08:57


On Sat, Oct 25, 2008 at 12:33 PM, Sangamesh B <forum.san_at_[hidden]> wrote:
> 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. Initial benchmark result was on 2 nodes. Later the benchmark was
done on only one node.
 OpenMPI - 25 m 39 s.
 MPICH2 - 15 m 53 s.
>
> This job is run with 8 processes i.e. on 2 nodes.
>
 MPICH2: 26 m 54 s
 OpenMPI: 24 m 39 s
>
> This job is run with 4 processes i.e. on 1 node
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