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Subject: Re: [OMPI users] openmpi (1.2.8 or above) and Intel composer XE 2011 (aka 12.0)
From: Robert Horton (r.horton_at_[hidden])
Date: 2011-05-27 04:30:50


On Wed, 2011-05-25 at 19:06 -0400, Jeff Squyres wrote:
> I'm not sure what you're saying here. There is a large difference
> between "--mca a,b,c" and "--mca a,b".
>
> In the former, all 3 communication methods will be used (a, b, and c).
> In the latter, only 2 will be used (a and b).
>
> To be clear, if you explicitly list which BTLs to use, OMPI will only
> (try to) use exactly those and no others.

It might be worth putting the sm btl in the FAQ:

http://www.open-mpi.org/faq/?category=openfabrics#ib-btl