Basic HTML version of Foils prepared 19 September 98

Foil 52 Example Fortran: Performing a Sum

From MPI Message Passing Interface Computational Science for Simulations -- Fall Semester 1998. by Geoffrey C. Fox, Nancy McCracken
call MPI_COMM_RANK( comm, rank, ierr )
if (rank .eq. 0) then
read *, n
end if
call MPI_BCAST(n, 1, MPI_INTEGER, 0, comm, ierr )
# Each process computes its range of numbers to sum
lo = rank*n+1
hi = lo+n-1
sum = 0.0d0
do i = lo, hi
sum = sum + 1.0d0 / i
end do
call MPI_REDUCEALL( sum, sumout, 1, MPI_DOUBLE,
& MPI_ADD_DOUBLE, comm, ierr)

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