Interpretation of Returned Message Status

• In C status is a structure of type MPI_Status

  • status.source gives actual source process
  • status.tag gives the actual message tag

• In Fortran the status is an integer array and different elements give:

  • in status(MPI_SOURCE) the actual source process
  • in status(MPI_TAG) the actual message tag

• In C and Fortran, the number of elements (called count) in the message can be found from call to

• call MPI_GET_COUNT (IN status, IN datatype,

• OUT count, OUT error_message)

  • where as usual in C last argument is missing as returned in function call

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