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Created by: mhoemmen

@trilinos/tpetra

Issue reported by @spdomin and currently tracked elsewhere.

Stub summary: Some MPI implementations consumes buffer space on a process proportional to the number of processes with which that process exchanges point-to-point messages. Buffers grow dynamically, but the MPI implementation annoyingly never returns that memory. This puts a burden on applications to prefer collectives to point-to-point messages, and in general to keep the in- and out-degree of point-to-point messages on a process low.