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C
C Copyright (C) by Argonne National Laboratory
C See COPYRIGHT in top-level directory
C
subroutine uop( cin, cout, count, datatype )
implicit none
include 'mpif.h'
integer cin(*), cout(*)
integer count, datatype
integer i
if (datatype .ne. MPI_INTEGER) then
write(6,*) 'Invalid datatype passed to user_op()'
return
endif
do i=1, count
cout(i) = cin(i) + cout(i)
enddo
end
C
program main
implicit none
include 'mpif.h'
integer inbuf(2), outbuf(2)
integer ans, rank, size, comm
integer errs, ierr
integer sumop
external uop
errs = 0
call mtest_init( ierr )
C
C A simple test of exscan
comm = MPI_COMM_WORLD
call mpi_comm_rank( comm, rank, ierr )
call mpi_comm_size( comm, size, ierr )
inbuf(1) = rank
inbuf(2) = -rank
call mpi_exscan( inbuf, outbuf, 2, MPI_INTEGER, MPI_SUM, comm,
& ierr )
C this process has the sum of i from 0 to rank-1, which is
C (rank)(rank-1)/2 and -i
ans = (rank * (rank - 1))/2
if (rank .gt. 0) then
if (outbuf(1) .ne. ans) then
errs = errs + 1
print *, rank, ' Expected ', ans, ' got ', outbuf(1)
endif
if (outbuf(2) .ne. -ans) then
errs = errs + 1
print *, rank, ' Expected ', -ans, ' got ', outbuf(1)
endif
endif
C
C Try a user-defined operation
C
call mpi_op_create( uop, .true., sumop, ierr )
inbuf(1) = rank
inbuf(2) = -rank
call mpi_exscan( inbuf, outbuf, 2, MPI_INTEGER, sumop, comm,
& ierr )
C this process has the sum of i from 0 to rank-1, which is
C (rank)(rank-1)/2 and -i
ans = (rank * (rank - 1))/2
if (rank .gt. 0) then
if (outbuf(1) .ne. ans) then
errs = errs + 1
print *, rank, ' sumop: Expected ', ans, ' got ', outbuf(1)
endif
if (outbuf(2) .ne. -ans) then
errs = errs + 1
print *, rank, ' sumop: Expected ', -ans, ' got ', outbuf(1)
endif
endif
call mpi_op_free( sumop, ierr )
C
C Try a user-defined operation (and don't claim it is commutative)
C
call mpi_op_create( uop, .false., sumop, ierr )
inbuf(1) = rank
inbuf(2) = -rank
call mpi_exscan( inbuf, outbuf, 2, MPI_INTEGER, sumop, comm,
& ierr )
C this process has the sum of i from 0 to rank-1, which is
C (rank)(rank-1)/2 and -i
ans = (rank * (rank - 1))/2
if (rank .gt. 0) then
if (outbuf(1) .ne. ans) then
errs = errs + 1
print *, rank, ' sumop2: Expected ', ans, ' got ', outbuf(1)
endif
if (outbuf(2) .ne. -ans) then
errs = errs + 1
print *, rank, ' sumop2: Expected ', -ans, ' got ',outbuf(1)
endif
endif
call mpi_op_free( sumop, ierr )
call mtest_finalize( errs )
end
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