[mpiwg-ft] Proposal Feedback
bouteill at icl.utk.edu
Fri Feb 21 17:33:42 CST 2014
Le 21 févr. 2014 à 17:54, Jim Dinan <james.dinan at gmail.com> a écrit :
> Hi All,
> In reviewing the proposal, a couple questions/comments came up:
> (1) Are the semantics for the MPI probe operations (probe, iprobe, mprobe) well defined? Including when MPI_ANY_SOURCE is used?
Yes, they are exactly the same as for normal recv operations. We had a WG phone call issue on mprobe alone, sometime last september, to verify that it was not problematic.
> (2) For comm_shrink, what happens when the remote group in an intercommunicator becomes empty? Is it valid to get back an intercommunicator with an empty remote group?
That’s a pretty bizarre case. It is to be noted that the semantic for the shrink is well defined: the outcome is the same as if the user had called split with colors set to MPI_UNDEFINED at all remote group processes. From the definition of SPLIT stated page 247, the well defined outcome is that MPI_COMM_NULL is returned when a color is used on only one side of the intercomm.
> (3) In 15.2 (pg. 594:21), can we replace the sentence "always complete in a finite amount of time" with the simpler "eventually complete”?
I believe the original formulation carries the argument more visibly by being pedantic; but if you feel strongly about it, I don't.
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