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

[Balaji, Pavan]

You can free the request with MPI_Request_free if you don't want to wait on it.  I have no idea how you'll write a correct program without waiting for receive completions at least, though.

  -- Pavan

> On Apr 2, 2015, at 11:44 PM, Lei Shi <lshi at ku.edu> wrote:
> 
> Hi Junchao,
> 
> Thanks for your reply. For my case, I don't want to check the data have been received or not. So I don't want to call MPI_Test or any function to verify it. But my problem is like if I ignore calling the MPI_Wait, just call Isend/Irev, my program freezes for several sec and then continues to run. My guess is probably I messed up the MPI library internal buffer by doing this.  
> 
> 
> On Thu, Apr 2, 2015 at 7:25 PM, Junchao Zhang <jczhang at mcs.anl.gov> wrote:
> Does MPI_Test fit your needs?
> 
> --Junchao Zhang
> 
> On Thu, Apr 2, 2015 at 7:16 PM, Lei Shi <lshi at ku.edu> wrote:
> I want to use non-blocking send/rev MPI_Isend/MPI_Irev to do communication. But in my case, I don't really care what kind of data I get or it is ready to use or not. So I don't want to waste my time to do any synchronization  by calling MPI_Wait or etc API. 
> 
> But when I avoid calling MPI_Wait, my program is freezed several secs after running some iterations (after multiple MPI_Isend/Irev callings), then continues. It takes even more time than the case with MPI_Wait.  So my question is how to do a "true" non-blocking communication without waiting for the data ready or not. Thanks.
> 
> 
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--
Pavan Balaji  ✉️
http://www.mcs.anl.gov/~balaji

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