I do not see a need for clarification. As long as somewhere in the standard the following points are clear enough: 1) Only MPI_BARRIER promises barrier behavior 2) Any collective may be implemented with barrier behavior as a side effect (performance issues make some collectives (eg. MPI_Bcast) unlikely to be barrier like. An MPI_Allreduce will always be barrier like. Either way though, the standard does not stipulate) Dick Treumann - MPI Team/TCEM IBM Systems & Technology Group Dept 0lva / MS P963 -- 2455 South Road -- Poughkeepsie, NY 12601 Tele (845) 433-7846 Fax (845) 433-8363 mpi-21-bounces_at_[hidden] wrote on 01/28/2008 12:52:54 PM:
Mainly to Jeff Squyres, Hubert Ritzdorf, Rolf Rabenseifner, Nicholas Nevin, Bill Gropp, Dick Treumann
This is a follow up to: MPI_FINALIZE in MPI-2 (with spawn) in http://www.cs.uiuc.edu/homes/wgropp/projects/parallel/MPI/mpi- errata/index.html with mail discussion in http://www.cs.uiuc.edu/homes/wgropp/projects/parallel/MPI/mpi- errata/discuss/finalize/ _________________________________________
When I understand correctly, then a clarification is not needed because the MPI standard expresses all, i.e. - MPI_Finalize need not to behave like a barrier - but is allowed to have a barrier inside. - If the user wants to exit one spawned process while the others still continue to work, he/she must disconnect this process before calling MPI_Finalize on it.
If somebody wants a clarification to be included into the standard and therefore in Ballot 4, please send me your wording with the page and line references included.
If all agree, that no clarification is needed, then I would finish this track.
Best regards Rolf
Dr. Rolf Rabenseifner . . . . . . . . . .. email rabenseifner_at_[hidden] High Performance Computing Center (HLRS) . phone ++49(0)711/685-65530 University of Stuttgart . . . . . . . . .. fax ++49(0)711 / 685-65832 Head of Dpmt Parallel Computing . . . www.hlrs.de/people/rabenseifner Nobelstr. 19, D-70550 Stuttgart, Germany . (Office: Allmandring 30) _______________________________________________ mpi-21 mailing list mpi-21_at_[hidden] http://lists.cs.uiuc.edu/mailman/listinfo/mpi-21
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