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Subject: Re: [OMPI users] openmpi (1.2.8 or above) and Intel composer XE 2011 (aka 12.0)
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2011-05-25 19:06:29

On May 24, 2011, at 7:29 AM, Salvatore Podda wrote:

>> Yes, it was a typo, I use to add the "sm" flag to the "--mca btl"
>> option. However I think this is not mandatory, as I suppose
>> openmpi use the the so-called "Law of Least Astonishment"
>> also in this case and adopts "sm" for the intra-node communication
>> or, if you prefer, avoiding to add the sm string does not mean "not use
>> shared memory".

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.

For your specific issue, I don't think there's much we can do with regards to the 1.2 series -- it's so ancient that unless you have a support contract with someone, we really don't offer public/mailing list support for it any more. :-(

Jeff Squyres
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