1 ! This file created from test/mpi/f77/coll/exscanf.f with f77tof90
2 ! -*- Mode: Fortran; -*-
4 ! (C) 2003 by Argonne National Laboratory.
5 ! See COPYRIGHT in top-level directory.
7 subroutine uop( cin, cout, count, datatype )
9 integer cin(*), cout(*)
10 integer count, datatype
14 if (datatype .ne. MPI_INTEGER) then
15 write(6,*) 'Invalid datatype passed to user_op()'
21 cout(i) = cin(i) + cout(i)
27 integer, dimension(:), allocatable :: inbuf, outbuf
28 integer ans, rank, size, comm
32 allocate(inbuf(2), STAT=status)
33 allocate(outbuf(2), STAT=status)
36 call mtest_init( ierr )
38 ! A simple test of exscan
41 call mpi_comm_rank( comm, rank, ierr )
42 call mpi_comm_size( comm, size, ierr )
46 call mpi_exscan( inbuf, outbuf, 2, MPI_INTEGER, MPI_SUM, comm, &
48 ! this process has the sum of i from 0 to rank-1, which is
49 ! (rank)(rank-1)/2 and -i
50 ans = (rank * (rank - 1))/2
52 if (outbuf(1) .ne. ans) then
54 print *, rank, ' Expected ', ans, ' got ', outbuf(1)
56 if (outbuf(2) .ne. -ans) then
58 print *, rank, ' Expected ', -ans, ' got ', outbuf(1)
62 ! Try a user-defined operation
64 call mpi_op_create( uop, .true., sumop, ierr )
67 call mpi_exscan( inbuf, outbuf, 2, MPI_INTEGER, sumop, comm, &
69 ! this process has the sum of i from 0 to rank-1, which is
70 ! (rank)(rank-1)/2 and -i
71 ans = (rank * (rank - 1))/2
73 if (outbuf(1) .ne. ans) then
75 print *, rank, ' sumop: Expected ', ans, ' got ', outbuf(1)
77 if (outbuf(2) .ne. -ans) then
79 print *, rank, ' sumop: Expected ', -ans, ' got ', outbuf(1)
82 call mpi_op_free( sumop, ierr )
85 ! Try a user-defined operation (and don't claim it is commutative)
87 call mpi_op_create( uop, .false., sumop, ierr )
90 call mpi_exscan( inbuf, outbuf, 2, MPI_INTEGER, sumop, comm, &
92 ! this process has the sum of i from 0 to rank-1, which is
93 ! (rank)(rank-1)/2 and -i
94 ans = (rank * (rank - 1))/2
96 if (outbuf(1) .ne. ans) then
98 print *, rank, ' sumop2: Expected ', ans, ' got ', outbuf(1)
100 if (outbuf(2) .ne. -ans) then
102 print *, rank, ' sumop2: Expected ', -ans, ' got ',outbuf(1)
105 call mpi_op_free( sumop, ierr )
108 call mtest_finalize( errs )
109 call mpi_finalize( ierr )