Sorry - referenced the wrong commit. It was r25331
On Oct 19, 2011, at 2:28 PM, Ralph Castain wrote: > Hi folks > > For those of you who don't follow the commits... > > I just committed (r25323) an extension of the orte_ess.proc_get_locality > function that allows a process to get its relative resource usage with any > other proc in the job. In other words, you can provide a process name to the > function, and the returned bitmask tells you if you share a node, numa, > socket, caches (by level), core, and hyperthread with that process. > > If you are on the same node and unbound, of course, you share all of those. > However, if you are bound, then this can help tell you if you are on a common > numa node, sharing an L1 cache, etc. Might be handy. > > I implemented the underlying functionality so that we can further extend it > to tell you the relative resource location of two procs on a remote node. If > that someday becomes of interest, it would be relatively easy to do - but > would require passing more info around. Hence, I've allowed for it, but not > implemented it until there is some identified need. > > Locality info is available anytime after the modex is completed during > MPI_Init, and is supported regardless of launch environment (minus cnos, for > now), launch by mpirun, or direct-launch - in other words, pretty much always. > > Hope it proves of help in your work > Ralph >
