[mpich-discuss] polling vs blocking

[Jeff Hammond]

What do you mean by polling?  Are you comparing nonblocking
collectives with polling to blocking collectives?

Polling is a more power-intensive activity than waiting on completion
inside of a blocking operation since the CPU can, in theory, go to
sleep and wake up on an interrupt/signal/whatever from the network.

Jeff

On Mon, Apr 16, 2012 at 8:50 AM, koko jumbo <hpcconnect at gmail.com> wrote:
> Hi All,
>
> I have been doing some experiments with MPI collective operations and I
> found
> that polling mode in MPI delivers better performance than the blocking mode
> although
> blocking mode saves some power. Can anybody tell me why is it so?
>
> Thanks
> Ranjan
>
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-- 
Jeff Hammond
Argonne Leadership Computing Facility
University of Chicago Computation Institute
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