[mvapich-discuss] Correct Configuration options for MVAPICH2 on AMD Opteron 6136(8-core) processor.

[Dhabaleswar Panda]

You do not need any special configuration for Opteron platform. MVAPICH2
automatically detects the platform architecture, number of cores, etc. and
carries out internal tuning. Since you are using Mellanox QDR adapters and
switch, you can select the OFA-IB-CH3 interface to get the best set of
features, performance and scalability. You can use the default
configuration scheme (as given below or with the shared library option).

./configure --with-device=ch3:mrail --with-rdma=gen2

This is outlined in Section 4.4 of the user guide at the following URL:

http://mvapich.cse.ohio-state.edu/support/user_guide_mvapich2-1.7rc1.html#x1-100004.4

Regarding the compiler issue you have indicated, the performance of
communication steps in a MPI library is not very sensitive to the compiler
being used. However, computation steps can be optimized by different
compilers. Thus, you can use either Intel or Open64.

Hope this helps.

Thanks,

DK

On Wed, 7 Sep 2011, Mrs J. Lakshmi wrote:

> Hi,
> Â Â We are trying to install MVAPICH2 for our cluster built on 4-cpu, 8-core AMD 6136 processors interconnected with IB-HBAs through a Mellanox MIS5023 QDR switch. the cluster has 9 nodes. Can someone help us with the correct configuration options for using MVAPICH2 1.7 version on this cluster? Our environment requires use of different compilers like gnu, intel and open64. Which of these would run better for this cluster?
>
> Thankyou,
> with warm regards,
> Lakshmi J
>
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