[Mpi3-hybridpm] [Mpi3-rma] Alternative Proposal for Shared Memory Support

Torsten Hoefler htor at illinois.edu
Tue Mar 15 21:19:18 CDT 2011

On Tue, Mar 15, 2011 at 06:44:49PM -0700, Bronis R. de Supinski wrote:
> Torsten:
> I suggested a joint meeting because that will make it
> clear on the schedule. I was not thinking about adding
> administrative overhead. I would like to be present.
> I will likely miss the Tuesday morning sessions due to
> a long telecon that I need to attend.
Ok. This decision is up to the WG chairs.

> I think some sort of "best effort" wording will be needed.
> It is possible that processes are on the same node but
> that no shared memory is available. In that case distinct
> physical memory regions could be returned.

> I am not quite following the group comments. Are you saying
> that the different windows are returned to different shared
> memory domains? 

> I thought the window would be available to all processes but
> physically shared memory is used when possible.  
Well, this would be an option too -- but I think it's not catching the
gist of the idea.

> How is the group returned? How do you query it?
MPI_Win_get_group :-).


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Torsten Hoefler         | Performance Modeling and Simulation Lead
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