Return status objects

Return Status Objects

• The return status object is used after completion of a receive to find the actual length, source, and tag of a message.
• Return status object is MPI-defined type.
• In C status is a structure.

  status.source gives source process

  status.tag gives the message tag

• In Fortran status is an integer array

  status(MPI_SOURCE) gives source process

  status(MPI_TAG) gives message tag

• Number of elements in message is given by

   mpi_get_count (status, datatype, count, ierr)