[mvapich-discuss] MPI and CUDA Streams

[sreeram potluri]

Hi Brody,

MVAPICH2 does use streams/events internally to pipeline copies from the GPU
and transfers over the network. However, it does not have a way to expose
these streams/events to the application or for the application to indicate
which streams/events MVAPICH2 should use.

The only way to synchronize between MPI_Isend/recv and GPU kernels is to
use MPI_Wait/Waitall which I assume is what you are using right now.

Best
Sreeram Potluri

On Sat, Sep 15, 2012 at 11:34 PM, Brody Huval <brodyh at stanford.edu> wrote:

> Hi,
>
> Is there a way to have MPI_Isend/recv operations that are synchronized
> with cuda streams and cuda events? Such that we can queue them with other
> GPU kernels?
>
> Thanks,
> Brody Huval
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