Persistent Communications

• MPI_Send_init

  • Creates a request (like an MPI_Isend) but doesn’t start it

• MPI_Start

  • Actually begin an operation

• MPI_Startall

  • Start all in a collection

• Also MPI_Recv_init, MPI_Rsend_init, MPI_Ssend_init, MPI_Bsend_init

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