Defining persistent communication requests

Persistent Communication Requests

• Can bind together arguments of a communication call to take overhead out of a loop
• mpi_send_init creates a communication request that completely specifies a standard send operation. It binds:
  • start of buffer, and number of elements sent,
  • datatype,
  • destination rank, message tag, and communicator
• mpi_recv_init creates a communication request that completely specifies a receive operation.
• Similar routines for ready, synchronous, and buffered send modes.