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Subject: Re: [OMPI devel] selectively bind MPI to one HCA out of available ones
From: Pavel Shamis (Pasha) (pashash_at_[hidden])
Date: 2009-07-16 04:16:54


Hi,
You can select ib device used with openib btl by using follow parametres:
 MCA btl: parameter "btl_openib_if_include" (current value: <none>, data
source: default value)
                          Comma-delimited list of devices/ports to be
used (e.g. "mthca0,mthca1:2"; empty value means to
                          use all ports found). Mutually exclusive with
btl_openib_if_exclude.
 MCA btl: parameter "btl_openib_if_exclude" (current value: <none>, data
source: default value)
                          Comma-delimited list of device/ports to be
excluded (empty value means to not exclude any
                          ports). Mutually exclusive with
btl_openib_if_include.

For example, if you want to use first port on mthc0 you command line
will look like:

mpirun -np............. --mca btl_openib_if_include mthca0:1 ....

Pasha

neeraj_at_[hidden] 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)
> 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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