Open MPI logo

Open MPI User's Mailing List Archives

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

Subject: Re: [OMPI users] Oversubscribing a subset of a machine's cores
From: Torje Henriksen (torjeh_at_[hidden])
Date: 2008-02-11 04:15:39


Hi,

Thanks for the heads up Joseph, you sent me in the right direction.
Very helpful indeed, although the command that seems to be doing the
trick on my system is

$taskset -c X ...

Best regards,

Torje Henriksen

On Feb 7, 2008, at 2:47 PM, Joe Landman wrote:

> Torje Henriksen wrote:
>
> [...]
>
>> Still, all eight cores are being used. I can see why you would want
>> to
>> use all cores, and I can see that oversubscribing a sub-set of the
>> cores might seem silly. My question is, is it possible to do what I
>> want to do without hacking the open mpi code?
>
> Could you get numactl to help you do what you want? That is, for the
> code, somehow tweak the launcher to run
>
> numactl --physcpubind=X ...
>
> or similar?
>
>
>
> --
> Joseph Landman, Ph.D
> Founder and CEO
> Scalable Informatics LLC,
> email: landman_at_[hidden]
> web : http://www.scalableinformatics.com
> http://jackrabbit.scalableinformatics.com
> phone: +1 734 786 8423
> fax : +1 866 888 3112
> cell : +1 734 612 4615
> _______________________________________________
> users mailing list
> users_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/users