[mpiwg-coll] backward communication in neighborhood collectives

Anthony Skjellum tony at runtimecomputing.com
Sun Jul 15 04:42:09 CDT 2018

Hi, I just saw this.

We definitely need to consider this concern.

I also need to go review the APIs.


On Sat, Jul 14, 2018 at 12:27 AM, Junchao Zhang <jczhang at mcs.anl.gov> wrote:

>  I want to try MPI neighborhood collectives. I have a communication graph
> and want to do both forward and backward communication along the edges.
> With current APIs, it looks I need to create two comm_dist_graphs. It is a
> waste since MPI implementations can do similar optimizations for the two.
>  Should MPI support this scenario?  Thanks.
> --Junchao Zhang
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Tony Skjellum, PhD
RunTime Computing Solutions, LLC
tony at runtimecomputing.com
direct: +1-205-918-7514
cell: +1-205-807-4968
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