Hi Terry,
I
had tested mostly MPI_Bcast, MPI_Reduce, MPI_Gather kind of MPI with openmpi-1.3
and hierarchical option enabled.In all these, i found results slower than
regular tuned collectives.
We
have HP Blade with intel clovertown processor(two quad core) connected
with DDR infiniband clos network.
Results
were tested on 12-16 nodes with 8 mpi process each node.
Regards
Neeraj Chourasia (MTS)
Computational Research Laboratories Ltd.
(A wholly Owned Subsidiary of TATA SONS Ltd)
B-101, ICC Trade Towers, Senapati Bapat Road
Pune 411016 (Mah) INDIA
(O) +91-20-6620 9863 (Fax) +91-20-6620 9862
M: +91.9225520634
Terry Dontje <Terry.Dontje@sun.com>
Sent by: users-bounces@open-mpi.org
08/07/2009 05:15 PM
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Please respond to
Open MPI Users <users@open-mpi.org> |
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Subject
| Re: [OMPI users] Performance question
about OpenMPI and MVAPICH2 on
IB |
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Hi Neeraj,
Were there specific collectives that were slower? Also what kind
of cluster were you running on? How many nodes and cores per node?
thanks,
--td
> Message: 3
> Date: Fri, 7 Aug 2009 16:51:05 +0530
> From: neeraj@crlindia.com
> Subject: Re: [OMPI users] Performance question about OpenMPI and
> MVAPICH2
on
IB
> To: Open MPI Users <users@open-mpi.org>
> Cc: users@open-mpi.org, users-bounces@open-mpi.org
> Message-ID:
> <OF62A95E62.D6758124-ON6525760B.003E2874-6525760B.003E1A66@crlindia.com>
>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi Terry,
>
> I feel hierarchical collectives are slower
compare to tuned one. I
> had done some benchmark in the past specific to collectives, and this
is
> what i feel based on my observation.
>
> Regards
>
> Neeraj Chourasia (MTS)
> Computational Research Laboratories Ltd.
> (A wholly Owned Subsidiary of TATA SONS Ltd)
> B-101, ICC Trade Towers, Senapati Bapat Road
> Pune 411016 (Mah) INDIA
> (O) +91-20-6620 9863 (Fax) +91-20-6620 9862
> M: +91.9225520634
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