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Foil 21 Blocking Send MPI_Send(C) MPI_SEND(Fortran)

From CPS615-Initial Lecture on MPI ending with discussion of basic MPI_SEND Delivered Lectures of CPS615 Basic Simulation Track for Computational Science -- 31 October 96. by Geoffrey C. Fox *
Secs 260.6
1 call MPI_SEND (
  • IN message start address of data to send
  • IN message_len number of items (length in bytes
    • determined by type)
  • IN datatype type of each data element
  • IN dest_rank Processor number (rank) of destination
  • IN message_tag tag of message to allow receiver to filter
  • IN communicator Communicator of both sender and receiver group
  • OUT error_message) Error Flag (absent in C)
2 Fortran example:
  • integer count, datatype, dest, tag, comm, mpierr
  • comm= MPI_COMM_WORLD
  • tag=0
  • datatype=MPI_REAL
3 call MPI_SEND (sndbuf,count,datatype,dest,tag,comm,mpierr)
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