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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.

--td