[mpich-discuss] Why does MPICH perform busy wait?
3jammer at informatik.uni-hamburg.de
Sun Oct 2 06:02:06 CDT 2016
Thank you for your insights.
I am still wondering, why the busy wait is in the MPI_Barrier.
As the purpose of the Barrier is to just wait for all involved processes.
I think the latentency introduced with one or another way of saving
energy is not such important in the Barrier.
For all other communication it might be best to perform a short busy
wait in order to guarantee a maximum message rate.
Was it considered before to introduce an "energy aware wait" for the
So that the user can still enjoy the high performance solution for all
Am 29.09.2016 um 17:08 schrieb Rob Latham:
> Your proposal introduces latency. Data centers want power efficiency,
> but several large classes of applications care about message rate.
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