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.
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_at_[hidden]>
Sent by: users-bounces_at_[hidden]
08/07/2009 05:15 PM
Please respond to
Open MPI Users <users_at_[hidden]>
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: 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]
> Content-Type: text/plain; charset="us-ascii"
> Hi Terry,
> I feel hierarchical collectives are slower compare to tuned one.
> had done some benchmark in the past specific to collectives, and this is
> 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
users mailing list
Notice: The information contained in this e-mail
message and/or attachments to it may contain
confidential or privileged information. If you are
not the intended recipient, any dissemination, use,
review, distribution, printing or copying of the
information contained in this e-mail message
and/or attachments to it are strictly prohibited. If
you have received this communication in error,
please notify us by reply e-mail or telephone and
immediately and permanently delete the message
and any attachments.
Internet communications cannot be guaranteed to be timely,
secure, error or virus-free. The sender does not accept liability
for any errors or omissions.Thank you