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Filters: Author is Squyres, Jeffrey M.  [Clear All Filters]
2017-05-22
Holmes, Daniel, Mohror, Kathryn, Grant, Ryan E., Skjellum, Anthony, Schulz, Martin, Bland, Wesley, Squyres, Jeffrey M..  2016.  MPI Sessions: Leveraging Runtime Infrastructure to Increase Scalability of Applications at Exascale. Proceedings of the 23rd European MPI Users' Group Meeting. :121–129.

MPI includes all processes in MPI\_COMM\_WORLD; this is untenable for reasons of scale, resiliency, and overhead. This paper offers a new approach, extending MPI with a new concept called Sessions, which makes two key contributions: a tighter integration with the underlying runtime system; and a scalable route to communication groups. This is a fundamental change in how we organise and address MPI processes that removes well-known scalability barriers by no longer requiring the global communicator MPI\_COMM\_WORLD.