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?
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.
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