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

[Lei Shi]

Pavan,

Thanks. You mean since I don't call MPI_Wait at all, the request object
does not get a chance to be released by the MPI library? Right? I will give
it a try. Thanks again!


On Fri, Apr 3, 2015 at 10:12 AM, Balaji, Pavan <balaji at anl.gov> wrote:

>
> 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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