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Test: Add MPI_Reduce test #72

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Merged
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Mar 31, 2025
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Test: Add MPI_Reduce test #72

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26 changes: 26 additions & 0 deletions tests/reduce_1.f90
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program test_reduce
use mpi
implicit none

integer :: ierr, rank, comm, root
integer :: sendval, recvval

comm = MPI_COMM_WORLD
root = 0

call MPI_Init(ierr)
call MPI_Comm_rank(comm, rank, ierr)

! Each rank will hold its rank ID in 'sendval'
sendval = rank
recvval = -999 ! dummy init

! We do a sum over all ranks
call MPI_Reduce(sendval, recvval, 1, MPI_INTEGER, MPI_SUM, root, comm, ierr)

if (rank == root) then
print *, "Root received sum of ranks = ", recvval
end if

call MPI_Finalize(ierr)
end program test_reduce