[mpich-discuss] Semantics of MPI_Cancel

[Rajeev Thakur]

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
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