[mpich-discuss] Order of completion in MPI_Waitany
matthieu.dorier at irisa.fr
Thu Sep 19 09:31:13 CDT 2013
I would like a precision on the semantics of MPI_Waitany in this situation:
- Process 1 does 2 MPI_Irecv with different tags A and B (the order doesn't matter); it then waits on the two requests with MPI_Waitany.
- In the mean time, process 2 does an MPI_Send with tag A, then MPI_Send with tag B.
Can I ensure that MPI_Waitany will always give me the index of the message corresponding to the first MPI_Send, i.e. the one with the tag A, even in situations where process 1 called MPI_Irecv on a tag B first?
PhD student at ENS Cachan Brittany and IRISA
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the discuss