Take a look at the output from "ompi_info --params btl openib" and you will see the available MCA params to direct the openib subsystem. I believe you will find that you can indeed specify the interface.

On Wed, Jul 15, 2009 at 7:15 AM, <neeraj@crlindia.com> wrote:

Hi all,

        I have a cluster where both HCA's of blade are active, but connected to different subnet.
        Is there an option in MPI to select one HCA out of available one's? I know it can be done by making changes in openmpi code, but i need clean interface like option during mpi launch time to select mthca0 or mthca1?

        Any help is appreciated. Btw i just checked Mvapich and feature is there inside.

Regards

Neeraj Chourasia (MTS)
Computational Research Laboratories Ltd.
(A wholly Owned Subsidiary of TATA SONS Ltd)
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