[mpich-discuss] Why does MPI_Init() get NULL argc and argv when running Fortran programs?

[clara]

Thanks a lot.

On Tue, Dec 4, 2012 at 3:36 AM, Jeff Hammond <jhammond at alcf.anl.gov> wrote:

> 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 <thakur at mcs.anl.gov> 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
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>
> --
> Jeff Hammond
> Argonne Leadership Computing Facility
> University of Chicago Computation Institute
> jhammond at alcf.anl.gov / (630) 252-5381
> http://www.linkedin.com/in/jeffhammond
> https://wiki.alcf.anl.gov/parts/index.php/User:Jhammond
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