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Subject: Re: [OMPI users] switch between ethernet and infiniband
From: Ralph Castain (rhc_at_[hidden])
Date: 2008-11-20 09:02:56

"btl" = bit transport layer

Yes, you can do so (assuming you configured/built support for both
transports into OMPI), but you probably don't want to specify things
that tightly. Usually, people do:

-mca btl tcp,sm,self


-mca btl openib,sm,self

This also selects the shared memory subsystem that provides
performance for processes that share nodes, and a "self" module that
supports simplified loopback calls when the code winds up sending
something back to the calling process.

On Nov 20, 2008, at 6:22 AM, Hailperin, Isaac wrote:

> Hi,
> am I right in assuming that I as a user can choose between
> ethernet and infiniband by issuing
> mpirun --mca btl tcp my_job
> or
> mpirun --mca btl openib my_job
> respectivly ?
> What does "btl" stand for?
> Isaac
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