C -*- Mode: Fortran; -*- 

C

C (C) 2012 by Argonne National Laboratory.

C     See COPYRIGHT in top-level directory.

C

C A simple test for Fortran support of the MPI_IN_PLACE value in Alltoall[vw].

C

       program main

       implicit none

       include 'mpif.h'

       integer SIZEOFINT

       integer MAX_SIZE

       parameter (MAX_SIZE=1024)

       integer rbuf(MAX_SIZE)

       integer rdispls(MAX_SIZE), rcounts(MAX_SIZE), rtypes(MAX_SIZE)

       integer ierr, errs

       integer comm, root

       integer rank, size

       integer iexpected, igot

       integer i, j

       errs = 0

       call mtest_init( ierr )

       comm = MPI_COMM_WORLD

       call mpi_comm_rank( comm, rank, ierr )

       call mpi_comm_size( comm, size, ierr )

       call mpi_type_size( MPI_INTEGER, SIZEOFINT, ierr )

       if (size .gt. MAX_SIZE) then

          print *, ' At most ', MAX_SIZE, ' processes allowed'

          call mpi_abort( MPI_COMM_WORLD, 1, ierr )

       endif

C

       do i=1,MAX_SIZE

           rbuf(i) = -1

       enddo

       do i=1,size

          rbuf(i) = (i-1) * size + rank

       enddo

       call mpi_alltoall( MPI_IN_PLACE, -1, MPI_DATATYPE_NULL,

     $      rbuf, 1, MPI_INTEGER, comm, ierr )

       do i=1,size

          if (rbuf(i) .ne. (rank*size + i - 1)) then

             errs = errs + 1

             print *, '[', rank, '] rbuf(', i, ') = ', rbuf(i),

     $             ', should be', rank * size + i - 1

          endif

       enddo

       do i=1,MAX_SIZE

           rbuf(i) = -1

       enddo

       do i=1,size

           rcounts(i) = (i-1) + rank

           rdispls(i) = (i-1) * (2*size)

           do j=0,rcounts(i)-1

               rbuf(rdispls(i)+j+1) = 100 * rank + 10 * (i-1) + j

           enddo

       enddo

       call mpi_alltoallv( MPI_IN_PLACE, 0, 0, MPI_DATATYPE_NULL,

     $                     rbuf, rcounts, rdispls, MPI_INTEGER,

     $                     comm, ierr )

       do i=1,size

           do j=0,rcounts(i)-1

               iexpected = 100 * (i-1) + 10 * rank + j

               igot      = rbuf(rdispls(i)+j+1)

               if ( igot .ne. iexpected ) then

                   errs = errs + 1

                   print *, '[', rank, '] ALLTOALLV got ', igot,

     $                   ',but expected ', iexpected,

     $                   ' for block=', i-1, ' element=', j

               endif

           enddo

       enddo

       do i=1,MAX_SIZE

           rbuf(i) = -1

       enddo

C          Alltoallw's displs[] are in bytes not in type extents.

       do i=1,size

           rcounts(i) = (i-1) + rank

           rdispls(i) = (i-1) * (2*size) * SIZEOFINT

           rtypes(i)  = MPI_INTEGER

           do j=0,rcounts(i)-1

               rbuf(rdispls(i)/SIZEOFINT+j+1) = 100 * rank

     $                                        + 10 * (i-1) + j

           enddo

       enddo

       call mpi_alltoallw( MPI_IN_PLACE, 0, 0, MPI_DATATYPE_NULL,

     $                     rbuf, rcounts, rdispls, rtypes,

     $                     comm, ierr )

       do i=1,size

           do j=0,rcounts(i)-1

               iexpected = 100 * (i-1) + 10 * rank + j

               igot      = rbuf(rdispls(i)/SIZEOFINT+j+1)

               if ( igot .ne. iexpected ) then

                   errs = errs + 1

                   print *, '[', rank, '] ALLTOALLW got ', igot,

     $                   ',but expected ', iexpected,

     $                   ' for block=', i-1, ' element=', j

               endif

           enddo

       enddo

       call mtest_finalize( errs )

       call mpi_finalize( ierr )

       end