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.
have HP Blade with intel clovertown processor(two quad core) connected
with DDR infiniband clos network.
were tested on 12-16 nodes with 8 mpi process each node.
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
|Terry Dontje <Terry.Dontje@sun.com>
Sent by: email@example.com
08/07/2009 05:15 PM
Please respond to
Open MPI Users <firstname.lastname@example.org>
|Re: [OMPI users] Performance question
about OpenMPI and MVAPICH2 on
Were there specific collectives that were slower? Also what kind
of cluster were you running on? How many nodes and cores per node?
> Message: 3
> Date: Fri, 7 Aug 2009 16:51:05 +0530
> From: email@example.com
> Subject: Re: [OMPI users] Performance question about OpenMPI and
> To: Open MPI Users <firstname.lastname@example.org>
> Cc: email@example.com, firstname.lastname@example.org
> 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
> what i feel based on my observation.
> 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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