You canceled the recv, not the send. The send will still go through and match the first available receive that can be matched. On Aug 7, 2013, at 3:25 PM, Matthieu Dorier wrote:

Hi,

Suppose process 0 does the following MPI_Irecv(...req) MPI_Cancel(req) MPI_Recv

and process 1 does MPI_Send MPI_Send

Does process 0 receives the data from the first or the second MPI_Send? (I'd tend to say the second, but I'd like a confirmation).

Thanks!

Matthieu Dorier PhD student at ENS Cachan Brittany and IRISA http://people.irisa.fr/Matthieu.Dorier _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss