Daniel J. Holmes, K. Mohror, Ryan E. Grant, A. Skjellum, M. Schulz, Wesley Bland, J. Squyres
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MPI Sessions: Leveraging Runtime Infrastructure to Increase Scalability of Applications at Exascale
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.
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