[mpich-discuss] MPI_Send and recv

[Pavan Balaji]

On 07/02/2013 05:18 PM, Sufeng Niu wrote:
> Thanks a lot, that is most confusing part for me in MPI. I would like to
> clear this type of problems.
>
> So the blocking begins to send message to itself, but there is no
> receive posted. Thus, the MPI block it. Am I right here?

Correct.

> Thus, I need a nonblocking receive to wait the message here. Can I use
> blocking receive?

If you use blocking receive, you'll block in the receive; how will you 
reach the send?

  -- Pavan

-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji