On Jun 22, 2010, at 6:46 PM, Mihaly Mezei wrote: > I just tried adding the include statement, but this is what I got: > > lapis.mssm.edu % mpif90 -o mpi0 mpi0.f > /share/apps/openmpi-1.4.1/include/mpif-common.h(402): error #6406: > Conflicting attributes or multiple declaration of name. [MPI_COMM_WORLD] > parameter (MPI_COMM_WORLD=0) > -----------------^ > compilation aborted for mpi0.f (code 1)
I'm guessing you didn't rename the parameter of the function (in your original source code, you had named a parameter MPI_COMM_WORLD). That would cause a conflict. In general, it's a Bad Item to name parameters -- or any symbols, really -- with an MPI_* prefix. The MPI_* prefix is reserved for the MPI library. So you actually had a few problems: - naming a parameter MPI_COMM_WORLD (causing a conflict when including mpif.h) - not including mpif.h in the subroutine (resulting in MPI_INTEGER having an undefined value) - you passed a MPI_COMM_WORLD in both a common block (through an intermediate integer) and as a parameter; I'm guessing that was just iterating through your testing, but just to be clear -- you only need one or the other, not both (or just including "mpif.h" if you know you're going to use MPI_COMM_WORLD) FWIW, I'd strongly recommend using "IMPLICIT NONE" in your code to prevent accidental use of variables without defined values, etc. -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
