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
13 ! if (datatype .ne. MPI_INTEGER) then
14 ! write(6,*) 'Invalid datatype passed to user_op()'
19 cout(i) = cin(i) + cout(i)
25 integer, dimension(:), allocatable :: inbuf, outbuf
26 integer ans, rank, size, comm
30 allocate(inbuf(2), STAT=status)
31 allocate(outbuf(2), STAT=status)
34 call mtest_init( ierr )
36 ! A simple test of exscan
39 call mpi_comm_rank( comm, rank, ierr )
40 call mpi_comm_size( comm, size, ierr )
44 call mpi_exscan( inbuf, outbuf, 2, MPI_INTEGER, MPI_SUM, comm, &
46 ! this process has the sum of i from 0 to rank-1, which is
47 ! (rank)(rank-1)/2 and -i
48 ans = (rank * (rank - 1))/2
50 if (outbuf(1) .ne. ans) then
52 print *, rank, ' Expected ', ans, ' got ', outbuf(1)
54 if (outbuf(2) .ne. -ans) then
56 print *, rank, ' Expected ', -ans, ' got ', outbuf(1)
60 ! Try a user-defined operation
62 call mpi_op_create( uop, .true., sumop, ierr )
65 call mpi_exscan( inbuf, outbuf, 2, MPI_INTEGER, sumop, comm, &
67 ! this process has the sum of i from 0 to rank-1, which is
68 ! (rank)(rank-1)/2 and -i
69 ans = (rank * (rank - 1))/2
71 if (outbuf(1) .ne. ans) then
73 print *, rank, ' sumop: Expected ', ans, ' got ', outbuf(1)
75 if (outbuf(2) .ne. -ans) then
77 print *, rank, ' sumop: Expected ', -ans, ' got ', outbuf(1)
80 call mpi_op_free( sumop, ierr )
83 ! Try a user-defined operation (and don't claim it is commutative)
85 call mpi_op_create( uop, .false., sumop, ierr )
88 call mpi_exscan( inbuf, outbuf, 2, MPI_INTEGER, sumop, comm, &
90 ! this process has the sum of i from 0 to rank-1, which is
91 ! (rank)(rank-1)/2 and -i
92 ans = (rank * (rank - 1))/2
94 if (outbuf(1) .ne. ans) then
96 print *, rank, ' sumop2: Expected ', ans, ' got ', outbuf(1)
98 if (outbuf(2) .ne. -ans) then
100 print *, rank, ' sumop2: Expected ', -ans, ' got ',outbuf(1)
103 call mpi_op_free( sumop, ierr )
106 call mtest_finalize( errs )
107 call mpi_finalize( ierr )