Envelope

• source/destination (int)

  • wildcard on recv: MPI_ANY_SOURCE

• tag (int)

  • wildcard on recv: MPI_ANY_TAG

• communicator (MPI_Comm)

• status (MPI_Status)

  • on recv only!
  • status->MPI_SOURCE
  • status->MPI_TAG
  • status->MPI_ERROR

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