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Subject: Re: [OMPI users] Performance question about OpenMPI and MVAPICH2 on IB
From: neeraj_at_[hidden]
Date: 2009-08-07 08:30:33


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_at_[hidden]>
Sent by: users-bounces_at_[hidden]
08/07/2009 05:15 PM
Please respond to
Open MPI Users <users_at_[hidden]>

To
users_at_[hidden]
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Subject
Re: [OMPI users] Performance question about OpenMPI and MVAPICH2 on
IB

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_at_[hidden]
> Subject: Re: [OMPI users] Performance question about OpenMPI and
> MVAPICH2 on IB
> To: Open MPI Users <users_at_[hidden]>
> Cc: users_at_[hidden], users-bounces_at_[hidden]
> Message-ID:
> <OF62A95E62.D6758124-ON6525760B.003E2874-6525760B.003E1A66_at_[hidden]>
>
> 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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