Thank you so much! Now I make sense Sufeng On Tue, Jul 2, 2013 at 5:19 PM, Pavan Balaji <[email protected]> wrote:

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

-- Best Regards, Sufeng Niu ECASP lab, ECE department, Illinois Institute of Technology Tel: 312-731-7219