Hi George
Thanks for the input. This might be an OS specific problem: I'm
running Mac OS X 10.5.7, and this problem appears in openmpi versions
1.3.2, 1.3.3 and 1.4a1r21734, using Intel Ifort Compiler 11.0 and 11.1
(and also g95 + 1.3.2). I haven't tried older versions. Also, I'm
running on a single machine:
zamb$ mpif90 inplace_test.f90
zamb$ mpirun -np 2 ./a.out
Result:
2.000000 2.000000 2.000000 2.000000
I've tryed the same code under Linux (openmpi-1.3.3 + gfortran) and it
works (and also other platforms / MPIs ).
Can you think of some --mca options I should try? (or any other
ideas...)
Cheers,
Ricardo
---
Prof. Ricardo Fonseca
GoLP - Grupo de Lasers e Plasmas
Instituto de Plasmas e Fusão Nuclear
Instituto Superior Técnico
Av. Rovisco Pais
1049-001 Lisboa
Portugal
tel: +351 21 8419202
fax: +351 21 8464455
web: http://cfp.ist.utl.pt/golp/
On Jul 28, 2009, at 4:24 , users-requ...@open-mpi.org wrote:
Message: 4
Date: Mon, 27 Jul 2009 17:13:23 -0400
From: George Bosilca <bosi...@eecs.utk.edu>
Subject: Re: [OMPI users] MPI_IN_PLACE in Fortran with MPI_REDUCE /
MPI_ALLREDUCE
To: Open MPI Users <us...@open-mpi.org>
Message-ID: <966a51c3-a15f-425b-a6b0-81221033c...@eecs.utk.edu>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
Ricardo,
I can't reproduce your problem with the latest version (trunk r21734).
If I run the provided program on two nodes I get the following answer.
[***]$ mpif77 inplace.f -o inplace -g
[***]$ mpirun -bynode -np 2 ./inplace
Result:
3.0000000 3.0000000 3.0000000 3.0000000
This seems correct and in sync with the C answer.
george.
On Jul 27, 2009, at 09:42 , Ricardo Fonseca wrote:
program inplace
use mpi
implicit none
integer :: ierr, rank, rsize, bsize
real, dimension( 2, 2 ) :: buffer, out
integer :: rc
call MPI_INIT(ierr)
call MPI_COMM_RANK(MPI_COMM_WORLD, rank, ierr)
call MPI_COMM_SIZE(MPI_COMM_WORLD, rsize, ierr)
buffer = rank + 1
bsize = size(buffer,1) * size(buffer,2)
if ( rank == 0 ) then
call mpi_reduce( MPI_IN_PLACE, buffer, bsize, MPI_REAL, MPI_SUM,
0, MPI_COMM_WORLD, ierr )
else
call mpi_reduce( buffer, 0, bsize, MPI_REAL, MPI_SUM,
0, MPI_COMM_WORLD, ierr )
endif
! use allreduce instead
! call mpi_allreduce( MPI_IN_PLACE, buffer, bsize, MPI_REAL,
MPI_SUM, MPI_COMM_WORLD, ierr )
if ( rank == 0 ) then
print *, 'Result:'
print *, buffer
endif
rc = 0
call mpi_finalize( rc )
end program
