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I am really no python expert, but it looks to me as if you were
gathering arrays filled with zeroes:
a = array('i', ) * n
Shouldn't this line be
a = array('i', [r])*n
where r is the rank of the process?
On Thu, May 20, 2010 at 12:00 AM, Battalgazi YILDIRIM
> I am trying to use intercommunicator ::Allgather between two child process.
> I have fortran and Python code,
> I am using mpi4py for python. It seems that ::Allgather is not working
> properly in my desktop.
> I have contacted first mpi4py developers (Lisandro Dalcin), he simplified
> my problem and provided two example files (python.py and fortran.f90,
> please see below).
> We tried with different MPI vendors, the following example worked correclty(
> it means the final print out should be array('i', [1, 2, 3, 4, 5, 6, 7, 8])
> However, it is not giving correct answer in my two desktop (Redhat and
> ubuntu) both
> using OPENMPI
> Could yo look at this problem please?
> If you want to follow our discussion before you, you can go to following
> yildirim_at_memosa:~/python_intercomm$ more python.py
> from mpi4py import MPI
> from array import array
> import os
> progr = os.path.abspath('a.out')
> child = MPI.COMM_WORLD.Spawn(progr,, 8)
> n = child.remote_size
> a = array('i', ) * n
> print a
> yildirim_at_memosa:~/python_intercomm$ more fortran.f90
> program main
> use mpi
> implicit none
> integer :: parent, rank, val, dummy, ierr
> call MPI_Init(ierr)
> call MPI_Comm_get_parent(parent, ierr)
> call MPI_Comm_rank(parent, rank, ierr)
> val = rank + 1
> call MPI_Allgather(val, 1, MPI_INTEGER, &
> dummy, 0, MPI_INTEGER, &
> parent, ierr)
> call MPI_Comm_disconnect(parent, ierr)
> call MPI_Finalize(ierr)
> end program main
> yildirim_at_memosa:~/python_intercomm$ mpif90 fortran.f90
> yildirim_at_memosa:~/python_intercomm$ python python.py
> array('i', [0, 0, 0, 0, 0, 0, 0, 0])
> B. Gazi YILDIRIM
> users mailing list