<br><font size=2 face="sans-serif">The MPI Standard currently states that
communicator creation is collective and deterministic. (I did not go back
and read the wording so I may be missing some nuance). To me that
means that when a communicator handle is returned, every process has certain
pieces of information encoded in the opaque communicator object that
it can assume match at every member. This shared view includes the
number of processes negotiated and an agreement on which process corresponds
to each rank. It does not mean that every process that was intended to
be in the communicator is still alive and reachable.</font>
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<br><font size=2 face="sans-serif">Are you changing the rule that "communicator
creation is collective and deterministic"? If not, there are
things which can occur before the "collective and deterministic"
commit point and things that occur after. </font>
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<br><font size=2 face="sans-serif">It seems to me that MPI_Comm_size must
return the number that was committed and if you need to find how many are
left after post-commit problems, it demands a different call. If you need
to find out how many were desired when fewer may have been committed, that
too is another call.</font>
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<br><font size=2 face="sans-serif"> Dick </font>
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<br><font size=2 face="sans-serif">Dick Treumann - MPI Team
<br>
IBM Systems & Technology Group<br>
Dept X2ZA / MS P963 -- 2455 South Road -- Poughkeepsie, NY 12601<br>
Tele (845) 433-7846 Fax (845) 433-8363<br>
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