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Subject: Re: [OMPI devel] RFC: Add "virbr0" to [btl|oob]_tcp_if_exclude?
From: Paul H. Hargrove (PHHargrove_at_[hidden])
Date: 2012-02-10 13:44:10


On 2/10/2012 10:38 AM, Jeff Squyres wrote:
> On Feb 10, 2012, at 1:00 PM, TERRY DONTJE wrote:
>
>>> >> Should we add "virbr0" to the default value for [btl|oob]_tcp_if_exclude?
>>> >>
>> > What happens to that value if you then set btl_tcp_if_exclude to some value on the mpirun command line?
> It works just fine. I.e., if you
>
> mpirun --mca btl_tcp_if_exclude lo,virbr0 ...
>
> That works like a champ.

Since the situation described is one where the user didn't know they
could/should disable xen, it is reasonable to think they ALSO don't know
they need to exclude virbr0. So, I read the question as meaning the
following:
      What happens when a user who doesn't know anything about virbr0 does
           mpirun --mca btl_tcp_if_exclude lo,eth8
And my guess is "nothing good happens".

-Paul

-- 
Paul H. Hargrove                          PHHargrove_at_[hidden]
Future Technologies Group
HPC Research Department                   Tel: +1-510-495-2352
Lawrence Berkeley National Laboratory     Fax: +1-510-486-6900