Scripted HTML version of Foils prepared 11 November 1996

Foil 6 Interpretation of Returned Message Status

From CPS615-Completion of MPI foilset and Application to Jacobi Iteration in 2D Delivered Lectures of CPS615 Basic Simulation Track for Computational Science -- 7 November 96. by Geoffrey C. Fox *
Secs 115.2
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
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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