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From: Tim S. Woodall (twoodall_at_[hidden])
Date: 2005-09-21 08:24:42


Thats correct. Not sure why TCP would have been used - unless IB
interfaces weren't up..

Brian Barrett wrote:
> Tim -
>
> Just to make sure I"m not losing it - if any of the "high speed"
> networks is found between peers, tcp shouldn't be used between that
> pair, right? I was pretty sure that's what the priority code did
> now, but wanted to make sure I wasn't losing it ;).
>
> Brian
>
> Begin forwarded message:
>
>
>>From: "Tim S. Woodall" <twoodall_at_[hidden]>
>>Date: September 20, 2005 7:51:42 PM GMT+02:00
>>To: Open MPI Users <users_at_[hidden]>
>>Subject: Re: [O-MPI users] HOWTO turn of "multi-rail" support at
>>runtime?
>>Reply-To: Open MPI Users <users_at_[hidden]>
>>
>>
>>Daryl,
>>
>>Try setting:
>>
>>-mca btl_base_include self,mvapi
>>
>>To specify that only lookback (self) and mvapi btls should be used.
>>
>>Can you forward me the config.log from your build?
>>
>>Thanks,
>>Tim
>>
>>Daryl W. Grunau wrote:
>>
>>
>>>Hi, I've got a dual-homed IB + GigE connected cluster for which
>>>I've built
>>>a very recent drop of OpenMPI (w/ mvapi support). I'm having
>>>difficulty
>>>making OMPI solely use native verbs as it's communication between
>>>nodes.
>>>I've tried all incantations of the following mca parameters to no
>>>avail:
>>>
>>> --mca btl_tcp_if_exclude "lo,eth0,eth1,ib0,ib1"
>>> --mca ptl_tcp_if_include "lo,eth0,eth1,ib0,ib1"
>>>
>>>Note I'm putting ib in the list because I really don't wish to use
>>>IP/IB;
>>>OMPI should be able to communicate at the native verbs level,
>>>right? If I
>>>leave ib0/1 unconfigured on my host, OMPI uses eth0 for its
>>>communication.
>>>If I bring up ib0, OMPI uses both eth0 and ib0! Is there any way
>>>I can
>>>specify for it to use none of these TCP interfaces? TIA!
>>>
>>>Daryl
>>>
>>>P.s. I can send output of ompi_info if that is helpful.
>>>_______________________________________________
>>>users mailing list
>>>users_at_[hidden]
>>>http://www.open-mpi.org/mailman/listinfo.cgi/users
>>>
>>>
>>
>>_______________________________________________
>>users mailing list
>>users_at_[hidden]
>>http://www.open-mpi.org/mailman/listinfo.cgi/users
>>
>
>
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