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Subject: Re: [OMPI users] Any way to make "btl_tcp_if_exclude" option system wide?
From: Eugene Loh (Eugene.Loh_at_[hidden])
Date: 2009-10-22 11:30:13


Eugene Loh wrote:

> Mike Hanby wrote:
>
>> My users are having to use this option with mpirun, otherwise the
>> jobs will normally fail with a 111 communication error:
>>
>> --mca btl_tcp_if_exclude lo,eth1
>>
>> Is there a way for me to set that MCA option system wide, perhaps via
>> an environment variable so that they don't have to remember to use it?
>
> Yes. Maybe you want to use a system-wide configuration file. I don't
> know where this is "best" documented, but it is at least discussed in
> the Sun HPC ClusterTools User Guide. (ClusterTools is an Open MPI
> distribution.) E.g.,
> http://dlc.sun.com/pdf/821-0225-10/821-0225-10.pdf . Look at Chapter
> 7. The section "Using MCA Parameters as Environment Variables" starts
> on page 69, but I'm not sure environment variables are really the way
> to go. I think you want section "To Specify MCA Parameters Using a
> Text File", on page 71. The file would look like this:
>
> % cat $OPAL_PREFIX/lib/openmpi-mca-params.conf
> btl_tcp_if_exclude = lo,eth1
>
> where $OPAL_PREFIX is where users will be getting OMPI. I'm not 100%
> sure on the name of that file, but need to run right now.

Ah, I think the file name is actually shown on the following page; it's
$prefix/etc/openmpi-mca-params.conf (.../etc/... rather than .../lib/...).