[mpich-discuss] Does MPICH implements polling mechanism on MPI_Recv?

[Anatoly G]

Thank you.
Anatoly.


On Thu, May 8, 2014 at 3:57 PM, Balaji, Pavan <balaji at anl.gov> wrote:

>
> This is expected.  Currently, the only way to not have MPICH poll is to
> configure with --with-device=ch3:sock.  Please note that this can cause
> performance loss (the polling is helpful for performance in the common
> case).
>
> We are planning to allow this in the default build as well in the future.
>
>   — Pavan
>
> On May 8, 2014, at 7:54 AM, Anatoly G <anatolyrishon at gmail.com> wrote:
>
> > Dear MPICH forum.
> > I created an endless MPI program.
> > In this program each process calls MPI_Recv from other process, w/o any
> MPI_Send.
> > When I execute this program I see each process takes ~ 100% CPU core.
> > Is this behavior (I suppose polling) is normal?
> > May I reduce MPI_Recv CPU penalty?
> >
> > Regards,
> > Anatoly.
> > <mpi_polling.cpp>_______________________________________________
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