[mvapich-discuss] WG: WG: missing Fortran bindings in MVAPICH2-2.1a

[Michael.Rachner at dlr.de]

Sorry, I wanted to send my email not to Jonathan alone, but to the mvapich-discuss.
  Michael



-----Ursprüngliche Nachricht-----
Von: Rachner, Michael 
Gesendet: Freitag, 12. Dezember 2014 10:03
An: 'Jonathan Perkins'
Betreff: AW: [mvapich-discuss] WG: missing Fortran bindings in MVAPICH2-2.1a

Thank You, Jonathan, for this hint.
Indeed, the problem with the missing explicit Ftn-interfaces in the mpi-module are  the arguments of "choice"-type.  Fortran 95 don't like them.
So the MPI-3.0  Standard document contains a complicated chapter 17.1  with these things.
As a consequence, MPICH seems to have chosen the slim way omitting in the mpi-module ("use mpi") the explicit Ftn-interfaces for MPI-routines with choice-type arguments, whereas OPENMPI has chosen the cumbercome way providing  the explicit Ftn-interfaces even for these MPI-routines. They succeeded.
For details: In November there were some emails discussing this issue in the OPENMPI-forum. 

Greetings
Michael Rachner


-----Ursprüngliche Nachricht-----
Von: Jonathan Perkins [mailto:perkinjo at cse.ohio-state.edu]
Gesendet: Donnerstag, 11. Dezember 2014 16:17
An: Rachner, Michael
Cc: mvapich-discuss at cse.ohio-state.edu
Betreff: Re: [mvapich-discuss] WG: missing Fortran bindings in MVAPICH2-2.1a

Hello Michael.  My investigation turned up the same issue in MPICH-3.1.3.  MVAPICH2-2.1a is based on MPICH-3.1.2 so it inherits the same behavior.

Here is a snippet from MPICH's user guide:

    4.2 Special Issues for Fortran

    MPICH provides two kinds of support for Fortran programs. For
    Fortran 77 programmers, the file mpif.h provides the definitions of
    the MPI constants such as MPI COMM WORLD. Fortran 90 programmers
    should use the MPI module instead; this provides all of the
    definitions as well as interface definitions for many of the MPI
    functions. However, this MPI module does not provide full Fortran 90
    support; in particular, interfaces for the routines, such as MPI
    Send, that take “choice” arguments are not provided.

It sounds like these are routines with ``choice'' arguments.

On Thu, Dec 11, 2014 at 01:29:03PM +0000, Michael.Rachner at dlr.de wrote:
> Dear developers,
> 
> I have just found, that exactly the same 11 missing Ftn-interfaces  are also missing in MPICH-3.0.4, MSMPI-5.0, IMPI-5.0.0  .
> So that looks, as if you all have inherited these missing interfaces from MPICH.
> 
> In contrast, with OPENMPI-1.8.2 all explicit Ftn-interfaces for MPI-routines needed by our CFD-code are present. Compliment!
> 
> Greetings
> Michael Rachner
> 
> 
> Von: mvapich-discuss
> [mailto:mvapich-discuss-bounces at cse.ohio-state.edu] Im Auftrag von 
> Michael.Rachner at dlr.de
> Gesendet: Donnerstag, 11. Dezember 2014 13:12
> An: mvapich-discuss at cse.ohio-state.edu
> Betreff: [mvapich-discuss] missing Fortran bindings in MVAPICH2-2.1a
> 
> Dear developers of MVAPICH2,
> 
> I found, that the explicit interfaces in the mpi-module are still missing in MVAPICH2-2.1a  (with INTEL-14.0.4) for these 11 MPI-routines:
>   MPI_BCAST
>   MPI_GATHER , MPI_GATHERV
>   MPI_REDUCE , MPI_ALLREDUCE
>   MPI_SCATTER, MPI_SCATTERV
>   MPI_SSEND  , MPI_RECV
>   MPI_WIN_ALLOCATE_SHARED, MPI_WIN_SHARED_QUERY
> 
> Greetings
>   Michael Rachner
> 

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--
Jonathan Perkins