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Subject: Re: [OMPI users] multipath support for infiniband
From: Jens Domke (jens.domke_at_[hidden])
Date: 2010-09-22 08:04:50


I already tried this parameter, but I don't see any improvements in the
benchmarks. Additionally while doing further investigations into the
opensm I didn't see the QP requests for other LIDs than the base LIDs.

Regards
Jens

Jeff Squyres wrote:
> Yes, check out the btl_openib_max_lmc MCA parameter:
>
> shell$ ompi_info --param btl openib --parsable | grep lmc
>
>
> On Sep 21, 2010, at 11:45 AM, Jens Domke wrote:
>
>> Hello,
>>
>> the InfiniBand architecture has a LMC feature to assign mutiple virtual LIDs to one port and so provides multiple paths between two ports. Is there a methode in openmpi to enable message-striping over these paths to increase bandwidth or avoid congestions?
>> (I don't mean the multirail feature, to split traffic across two ports of one Hca)
>> The only function I have found, was to enable automatic path migration over lmc, but this is only for failover, if I remember rightly.
>>
>> Regards,
>> Jens
>> _______________________________________________
>> users mailing list
>> users_at_[hidden]
>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>
>