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! This file created from f77/coll/uallreducef.f with f77tof90
!
! Copyright (C) by Argonne National Laboratory
! See COPYRIGHT in top-level directory
!
! Test user-defined operations. This tests a simple commutative operation
!
subroutine uop( cin, cout, count, datatype )
use mpi
integer cin(*), cout(*)
integer count, datatype
integer i
if (datatype .ne. MPI_INTEGER) then
print *, 'Invalid datatype (',datatype,') passed to user_op()'
return
endif
do i=1, count
cout(i) = cin(i) + cout(i)
enddo
end
program main
use mpi
external uop
integer ierr, errs
integer count, sumop, vin(65000), vout(65000), i, size
integer comm
errs = 0
call mtest_init(ierr)
call mpi_op_create( uop, .true., sumop, ierr )
comm = MPI_COMM_WORLD
call mpi_comm_size( comm, size, ierr )
count = 1
do while (count .lt. 65000)
do i=1, count
vin(i) = i
vout(i) = -1
enddo
call mpi_allreduce( vin, vout, count, MPI_INTEGER, sumop, &
& comm, ierr )
! Check that all results are correct
do i=1, count
if (vout(i) .ne. i * size) then
errs = errs + 1
if (errs .lt. 10) print *, "vout(",i,") = ", vout(i)
endif
enddo
count = count + count
enddo
call mpi_op_free( sumop, ierr )
call mtest_finalize(errs)
end
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