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From: shaposh_at_[hidden]
Date: 2006-11-28 22:07:53


In the machinefile, add for each node with M cpus:
myhost_at_mydomain slots=N cpus_allowed=<set>,
<set> being the subset of 0..M-1 in some yours-to-decide format and
with yours-to-decide default values.

 Best Regards,
 Alexander Shaposhnikov

On Wednesday 29 November 2006 06:16, Jeff Squyres wrote:
> There is not, right now. However, this is mainly because back when I
> implemented the processor affinity stuff in OMPI (well over a year
> ago), no one had any opinions on exactly what interface to expose to
> the use. :-)
>
> So right now there's only this lame control:
>
> http://www.open-mpi.org/faq/?category=tuning#using-paffinity
>
> I am not opposed to implementing more flexible processor affinity
> controls, but the Big Discussion over the past few months is exactly
> how to expose it to the end user. There have been several formats
> proposed (e.g., mpirun command line parameters, magic MPI attributes,
> MCA parameters, etc.), but nothing that has been "good" and "right".
> So here's the time to chime in -- anyone have any opinions on this?
>
> On Nov 25, 2006, at 9:31 AM, shaposh_at_[hidden] wrote:
> > Hello,
> > i cant figure out, is there a way with open-mpi to bind all
> > threads on a given node to a specified subset of CPUs.
> > For example, on a multi-socket multi-core machine, i want to use
> > only a single core on each CPU.
> > Thank You.
> >
> > Best Regards,
> > Alexander Shaposhnikov
> > _______________________________________________
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> > users_at_[hidden]
> > http://www.open-mpi.org/mailman/listinfo.cgi/users