Depends upon which one you are using. For example, allgather operates across the entire job, so all procs in that jobid have to invoke it. On the other hand, allgather_list only operates across the procs specified in the list, so only they need to invoke it.
Xcast sends a message to all procs in the job, but none of those procs needs to invoke anything - we just deliver the message to the specified RML tag on each proc. Of course, we assume that there is a recv (typically non-blocking) posted on that tag (or that it will be posted eventually). If not, then the message will just sit in the local oob waiting to be delivered - no harm done, it just gets ignored. Hope that helps. Let me know if you need some variant as I am adding (not reducing or changing) grpcomm capabilities on the tmp branch. Ralph On 1/29/08 12:19 PM, "Richard Graham" <rlgra...@ornl.gov> wrote: > Are the group operations in ORTE (I assume this is what the grpcomm > component does) available to subsets of a job, or do all procs in the > orte_jobid_t need to invoke this ? > > Thanks, > Rich > > _______________________________________________ > devel mailing list > de...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/devel
