[Nek5000-users] Nek MPI subroutine

nek5000-users at lists.mcs.anl.gov nek5000-users at lists.mcs.anl.gov
Wed Jan 7 18:02:18 CST 2015


Hello,

I don't understand the following subroutine in the Nek mpi_dummy.f file:

---------------------------------------------------------------------------------------------------------
      subroutine mpi_comm_rank ( comm, me, ierror )

      implicit none

      integer comm
      integer ierror
      integer me
      integer MPI_FAILURE
      parameter ( MPI_FAILURE = 1 )
      integer MPI_SUCCESS
      parameter ( MPI_SUCCESS = 0 )

      ierror = MPI_SUCCESS
      me = 0

      return
      end
---------------------------------------------------------------------------------------------------------

This will always return one. How does this give the rank of the process
then? Can someone please explain the reason for this function?

Thanks,
Pradeep
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