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WIP Tpetra: persistent MPI requests

James Willenbring requested to merge cgcgcg:tpetraPersistentPR into develop

Created by: cgcgcg



This PR adds the option to use persistent MPI communication in Tpetra. The defaults communication option is not changed. I tested this using MueLu, where this can be switched on for the solve phase only. There are probably quite a lot of cases where this will not work correctly, so I appreciate feedback!

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