Trying to wrap my head around this, so let me try a 2-node example. You want (each rank bound to a single core):
ranks 0-3 to be mapped onto node1 ranks 4-7 to be mapped onto node2 ranks 8-11 to be mapped onto node1 ranks 12-15 to be mapped onto node2 etc.etc. Correct? > On Jan 28, 2021, at 3:00 PM, Luis Cebamanos via users > <users@lists.open-mpi.org> wrote: > > Hello all, > > What are the options for binding MPI tasks on a blocks of cores per > node/socket/numa in a round-robin fashion? Say I want to fully populate 40 > core sockets on dual-socket nodes but in a round-robin fashion binding 4 > cores on the first node, then 4 cores on the next, and so on. Would be > ``--bind-to core``? > > srun can do this with ``distribution=plane`` so one could do ``srun > --distribution=plane=4``. > > cheers > >
