Open MPI logo

Open MPI User's Mailing List Archives

  |   Home   |   Support   |   FAQ   |   all Open MPI User's mailing list

Subject: Re: [OMPI users] Set GID
From: Pavel Shamis (Pasha) (pasha_at_[hidden])
Date: 2008-03-12 08:43:54


Ok, I will do.

Jeff Squyres wrote:
> 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
>
>

-- 
Pavel Shamis (Pasha)
Mellanox Technologies