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Subject: Re: [OMPI users] Set GID
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2008-03-12 08:23:00


Sure, that would be fine.

Can you write it up in a little more FAQ-ish style? I can add it to
the web page. See this wiki item:

     https://svn.open-mpi.org/trac/ompi/wiki/OMPIFAQEntries

On Mar 12, 2008, at 5:33 AM, Pavel Shamis (Pasha) wrote:

> Run opensm with follow parameters:
> opensm -c -o
>
> It will make 1 loop and will exit (-o parameter). The -c option says
> to
> opensm to generate option file.
> The file will be generated under /var/cache/opensm//opensm.opts
> Open the file and find line with "subnet_prefix". Replace the prefix
> with new one.
> Re-ran opensm: /etc/init.d/opensm start
> It will automatically load the option file from cache repository and
> will use new prefix
>
> Jeff ,
> Do we want to add it to Open-MPI FAQ ?
>
> Regards,
> Pasha
>
>
> Jon Mason wrote:
>> I am getting the following error when I try to run OMPI over my dual
>> port IB adapter:
>>
>> --------------------------------------------------------------------------
>> WARNING: There are more than one active ports on host 'vic20', but
>> the
>> default subnet GID prefix was detected on more than one of these
>> ports. If these ports are connected to different physical IB
>> networks, this configuration will fail in Open MPI. This version of
>> Open MPI requires that every physically separate IB subnet that is
>> used between connected MPI processes must have different subnet ID
>> values.
>>
>> Please see this FAQ entry for more details:
>>
>> http://www.open-mpi.org/faq/?category=openfabrics#ofa-default-subnet-gid
>>
>> NOTE: You can turn off this warning by setting the MCA parameter
>> btl_openib_warn_default_gid_prefix to 0.
>> --------------------------------------------------------------------------
>>
>>
>> I understand why it is doing the above based on the description in
>> the
>> link above, but I cannot seem to find anywhere that will tell me
>> how to
>> change the GID to something else.
>>
>> Thanks,
>> Jon
>> _______________________________________________
>> users mailing list
>> users_at_[hidden]
>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>>
>>
>
>
> --
> Pavel Shamis (Pasha)
> Mellanox Technologies
>
> _______________________________________________
> users mailing list
> users_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/users

-- 
Jeff Squyres
Cisco Systems