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From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2007-10-31 19:37:53


Also see:

http://www.open-mpi.org/faq/?category=tuning#paffinity-defs
http://www.open-mpi.org/faq/?category=tuning#using-paffinity
and
http://www.open-mpi.org/projects/plpa/

On Oct 31, 2007, at 11:55 AM, kyron_at_[hidden] wrote:

> It will indeed but you can have better control over the processor
> assignment by using processor affinity (also get better
> performance) as
> sen here:
>
> http://www.nic.uoregon.edu/tau-wiki/Guide:Opteron_NUMA_Analysis
> http://www-128.ibm.com/developerworks/linux/library/l-affinity.html
>
> Eric
>> I think if you boot the mpi on the host machine, and than run your
>> program with 8 thread (mpirun -np 8 <program_name>) , the operating
>> system will automatically distribute it to the cores.
>>
>> Jeff Pummill wrote:
>>> I am doing some testing on a variety of 8-core nodes in which I just
>>> want to execute a couple of executables and have them distributed to
>>> the available cores without overlapping. Typically, this would be
>>> done
>>> with a parameter like /-machinefile machines/, but I have no idea
>>> what
>>> names to put into the /machines/ file as this is a single node with
>>> two quad core cpu's. As I am launching the jobs sans scheduler, I
>>> need
>>> to specify what cores to run on I would think to keep from
>>> overscheduling some cores while others receive nothing to do at all.
>>>
>>> Simple suggestions? Maybe Open MPI takes care of this detail for me?
>>>
>>> Thanks!
>>>
>>> Jeff Pummill
>>> --------------------------------------------------------------------
>>> ----
>>>
>>> _______________________________________________
>>> users mailing list
>>> users_at_[hidden]
>>> http://www.open-mpi.org/mailman/listinfo.cgi/users
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-- 
Jeff Squyres
Cisco Systems