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Subject: Re: [OMPI users] mpirun only works when -np <4 (Gus Correa)
From: Terry Dontje (Terry.Dontje_at_[hidden])
Date: 2009-12-11 07:04:30

> Date: Thu, 10 Dec 2009 17:57:27 -0500
> From: Jeff Squyres <jsquyres_at_[hidden]>
> On Dec 10, 2009, at 5:53 PM, Gus Correa wrote:
>> > How does the efficiency of loopback
>> > (let's say, over TCP and over IB) compare with "sm"?
> Definitely not as good; that's why we have sm. :-) I don't have any quantification of that assertion, though (i.e., no numbers to back that up).
However, as Eugene wrote earlier you can actually increase the number of
fifos used by the SM and avoid the hang that way. Unless you are really
strapped for memory I think that would be the best way to go.