Hi, I just saw this. We definitely need to consider this concern. I also need to go review the APIs. Thanks, Tony On Sat, Jul 14, 2018 at 12:27 AM, Junchao Zhang <[email protected]> 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 [email protected] direct: +1-205-918-7514 cell: +1-205-807-4968