[mpich-discuss] How to use non-blocking send/receive without calling MPI_Wait

[Jeff Squyres (jsquyres)]

On Apr 3, 2015, at 6:09 PM, Balaji, Pavan <balaji at anl.gov> wrote:
> 
> I didn't look through the video, but what you are saying is not true.  You can free the request in the application (this simply reduces the reference count to that request).  MPI will still maintain one reference count to the request and will only free it when the data transfer completes.

That's correct.  The point of that blog entry is that you have to tell MPI that you're done with a request somehow, otherwise MPI *has* to keep those resources allocated.

MPI_TEST*/MPI_WAIT* are the usual ways to do this.  MPI_REQUEST_FREE is also a valid method, but, as has been stated, isn't advisable.

-- 
Jeff Squyres
jsquyres at cisco.com
For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/

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