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From: Chandan Basu (cbasu_at_[hidden])
Date: 2007-02-23 08:04:20

I am trying to use MPI_Alltoall in the following program. After execution all the nodes should show same value for the array su. However only the root node is showing correct value. other nodes are giving garbage value. Please help. I have used openmpi version "1.1.4". The mpif90 uses intel fortran cbasu ------------------------------------------------ program main implicit none include 'mpif.h' integer :: status(MPI_Status_size) integer :: ierr, rank, nProcs double precision :: s double precision, pointer :: su(:) call MPI_Init (ierr) call MPI_Comm_rank(MPI_COMM_WORLD, rank, ierr) call MPI_Comm_size(MPI_COMM_WORLD, nProcs, ierr) allocate(su(nProcs)) su = 0.0d0 s = 1.0d0 call MPI_Alltoall(s, 1, MPI_DOUBLE_PRECISION, su, 1, & & MPI_DOUBLE_PRECISION, MPI_COMM_WORLD, ierr); ! all nodes should have su(1:nProcs) = 1.0 at this pont print *, rank, su deallocate(su) call MPI_Finalize(ierr) end program main ----------------------------------------------