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From: Brian Barrett (brbarret_at_[hidden])
Date: 2005-09-21 01:37:00


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
>>
>>
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