Point to Point Communication

  • In two communicating MPI processes:
    one task is performing a send operation and the other task is performing a matching receive operation.
    MPI_Send(buffer,count,type,dest,tag,comm) ---> MPI_Recv(buffer,count,type,source,tag,comm,status)

  • A System Buffer allows asynchronous send-receive operations.

  • User managed address space (i.e. your program variables) is called the application buffer.
  • MPI Send/Receive can be blocking and non-blocking.
    Blocking - the function won't return until MPI has safely stored the message to be sent, or was able to retrieve a message for delivery.