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Subject: Re: [OMPI users] mpirun only works when -np <4 (Gus Correa)
From: Matthew MacManes (macmanes_at_[hidden])
Date: 2009-12-11 11:04:34


On my system, mpirun -np 8 -mca btl_sm_num_fifos 7 is much slower (and appeared to hang after several thousand interations) than -mca btl ^sm

Is there another better way I should be modifying fifos to get better performance?

Matt

On Dec 11, 2009, at 4:04 AM, Terry Dontje wrote:

>>
>> 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
>
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_________________________________
Matthew MacManes
PhD Candidate
University of California- Berkeley
Museum of Vertebrate Zoology
Phone: 510-495-5833
Lab Website: http://ib.berkeley.edu/labs/lacey
Personal Website: http://macmanes.com/