On Tue, Aug 16, 2005 at 12:25:32PM -0400, Jeff Squyres wrote: > Processor affinity is now implemented. You must ask for it via the MCA > param "mpi_paffinity_alone". If this parameter is set to a nonzero > value, OMPI will assume that its job is alone on the nodes that it is > running on, and, if you have not oversubscribed the node, will bind MPI > processes to processors, starting with processor ID 0 (i.e., > effectively bindings MPI processes to the processor number equivalent > to their relative VPID on that node). > > Please let me know how this works out for everyone; thanks.
Any thoughts on how to support NUMA with something like this? On the dual opteron w/DDR IB systems I've got, I'm seeing a big perfomance difference that primarily depends on which node the memory is on.
