As far as I can tell, there's no standard way to access argc/argv from Fortran until Fortran 2003 (http://fortranwiki.org/fortran/show/Command-line+arguments). Until MPI-3, the Fortran bindings were targeting FORTRAN 77 and Fortran 90 and 95 (and somewhat awkwardly), so there was no reasonable way to try to deal with them. Now that there are Fortran 2008 bindings in MPI-3, it might be interesting to consider how to handle argc/argv in a nice way just as is done for C. I don't know if anyone has thought of what happens when Fortran 2003+ users use the argc/argv access routines. It would seem that the same problem would exist that is present if one accesses argc/argv in C before MPI_INIT is called (i.e. argc/argv will have mpiexec-related arguments, not just the ones relative to the user program). I created a ticket with the MPI Forum about this: https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/351. Best, Jeff On Mon, Dec 3, 2012 at 9:19 AM, Rajeev Thakur <[email protected]> wrote:

The Fortran binding for MPI_Init is

MPI_INIT(IERROR)

There are no command line arguments.

Rajeev

On Dec 3, 2012, at 6:22 AM, clara wrote:

...

Hi,

I added a print statement at the beginning of MPI_Init() in mpich2-1.4 in order to check the arguments of MPI_Init(). When running a Fortran program, e.g. ep.S.1, the arguments of MPI_Init() are NULL; however, when running a C program, e.g. is.S.1, *argc of MPI_Init() is 1 and (*argv)[0] points to the name of the executed file is.S.1. Can anyone tell us why there is difference in dealing with arguments of MPI_Init() between C and Fortran programs? How could arguments be transferred to MPI_Init() for Fortran programs in mpich2? Thanks.

Best, Clara _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss

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-- Jeff Hammond Argonne Leadership Computing Facility University of Chicago Computation Institute [email protected] / (630) 252-5381 http://www.linkedin.com/in/jeffhammond https://wiki.alcf.anl.gov/parts/index.php/User:Jhammond