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Subject: [OMPI devel] On Host Topology Description (carto)
From: Rayson Ho (rayrayson_at_[hidden])
Date: 2008-01-11 15:10:06


The OnHostTopologyDescription is actually quite similar to the
Locality Group API and MPO on Solaris:

http://www.opensolaris.org/os/community/performance/mpo_overview.pdf
http://www.opensolaris.org/os/community/performance/numa/mpo_update.pdf

And we have some discussions on the OpenSolaris forum, "NUMA and
interconnect transfers":
http://opensolaris.org/jive/thread.jspa?messageID=185268

Rayson

On Jan 11, 2008 6:22 AM, Pak Lui <Pak.Lui_at_[hidden]> wrote:
> https://svn.open-mpi.org/trac/ompi/wiki/OnHostTopologyDescription
>
>
> Rayson Ho wrote:
> > Hello,
> >
> > I'm from the Sun Grid Engine (SGE) project (
> > http://gridengine.sunsource.net ). I am working on processor affinity
> > support for SGE.
> >
> > In 2005, we had some discussions on the SGE mailing list with Jeff on
> > this topic. As quad-core processors are available from AMD and Intel,
> > and higher core count per socket is coming soon, I would like to see
> > what we can do to come up with a simple interface for the SGE 6.2
> > release, which will be available in Q2 this year (or at least into an
> > "update" release of SGE6.2 if we couldn't get the changes in on time).
> >
> > The discussions we had before:
> > http://gridengine.sunsource.net/servlets/BrowseList?list=dev&by=thread&from=7081
> > http://gridengine.sunsource.net/servlets/BrowseList?list=dev&by=thread&from=4803
> >
> > I looked at the SGE code, the simplest we can do is to set an
> > environment variable to tell the task group the processor mask of the
> > node before we start each task group. Is it good enough for OpenMPI??
> >
> > After reading the OpenMPI code, I believe what we need to do is that
> > in ompi/runtime/ompi_mpi_init.c , we need to add an else case:
> >
> > if (ompi_mpi_paffinity_alone) {
> > ...
> > }
> > else
> > {
> > // get processor affinity information from batch system via the env var
> > ...
> > }
> >