On Nov 1, 2013, at 4:30 PM, Luiz Carlos da Costa Junior <[email protected]> wrote:

I understand that I will have to have N buffers, one for each posted MPI_Irecv. I will also have to TEST (using MPI_PROBE or MPI_WAITANY) until a message comes. The result of this test will identify which one of the posted MPI_Irecv has actually received the message and then process the right buffer. Is this correct?

Correct.

Should I have to change anything at the sender's processes?

Likely not. But you need to think through your algorithm to confirm that.

At the end, my receiver process receives a message identifying that it should exit this routine. What should I do with the already posted MPI_Irecv's? Can I cancel them?

Yes, you can with MPI_CANCEL. —- Pavan -- Pavan Balaji http://www.mcs.anl.gov/~balaji