[Mpi3-tools] [MPI3 Fortran] MPI 3.0: Fortran 2008 interface - issue with the LOGICAL kind

[Rolf Rabenseifner]

Late input for our telecon (mpi3-tools) today (Thursday). 
I added a few corrections, especially
page 2, line 44, the macros are in mpi.h and not in mpif.h.

Pages and lines of version 2013-04-17 and 2013-04.18 are nearly identical,
except additional new line 25 on page 2.

Best regards
Rolf

----- Original Message -----
> From: "Rolf Rabenseifner" <rabenseifner at hlrs.de>
> To: "MPI-3 Fortran working group" <mpi3-fortran at lists.mpi-forum.org>, mpi3-tools at lists.mpi-forum.org
> Sent: Wednesday, April 17, 2013 7:09:59 PM
> Subject: Re: [MPI3 Fortran] MPI 3.0: Fortran 2008 interface - issue with the LOGICAL kind
> Dear all in the Fortran and Tools WGs,
> 
> #364 presents a real bug in the MPI-3.0 Fortran binding of
> all three Fortran support methods.
> Reason: LOGICAL is used in MPI together with BIND(C),
> but LOGICAL is not interoperable with C.
> 
> Based on a lot of help from Bill Long, Craig, Jeff, Tobias, and
> Hubert,
> I produced a consistent proposal on how to fix the broken Section
> 17.1.5.
> 
> It is attached.
> 
> It looks quite long, but most of the text rationale, advices and
> examples
> to make life a bit easier.
> The normative part is similar in length as in the broken section.
> 
> The basics are simple:
> - Three implementation schemes:
> - A = no BIND(C)
> - B = standardized wrapping to the MPI C routines
> with strong reporting to the tools people
> - C = with BIND(C), but only partial possible and only for
> the new mpi_f08.
> - A and B works for all MPI routines and all compilers
> and all three support methods (mp_f08, mipi, mpif.h).
> - B can be combined with A or C.
> - B alone would be the most efficient way to implement
> the Fortran interface with wrappers to the MPI routines
> written in C
> - B alone or combined with A/C has the
> smallest impact to the tools provider.
> - mpif.h and mpi module require A or A+B
> for PMPI backward compatibility.
> - mpi_f08 can be implemented with A, A+B, B only, C/A, or C/A+B,
> i.e., most freedom for the new module.
> There is smaller need for backward compatibility
> of the profiling interface.
> 
> A+B would be a minimal solution,
> A+B+C is similar to what we have in the broken section.
> 
> Because current Section 17.1.5 is broken, it should be fixed
> through an erratum.
> 
> Craig and I will be at the tools telecon tomorrow.
> I hope, you have time to look at the document
> that I can answer your questions tomorrow.
> 
> Best regards
> Rolf
> 
> --
> Dr. Rolf Rabenseifner . . . . . . . . . .. email rabenseifner at hlrs.de
> High Performance Computing Center (HLRS) . phone ++49(0)711/685-65530
> University of Stuttgart . . . . . . . . .. fax ++49(0)711 / 685-65832
> Head of Dpmt Parallel Computing . . . www.hlrs.de/people/rabenseifner
> Nobelstr. 19, D-70550 Stuttgart, Germany . . . . (Office: Room 1.307)
> 
> _______________________________________________
> mpi3-fortran mailing list
> mpi3-fortran at lists.mpi-forum.org
> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi3-fortran

-- 
Dr. Rolf Rabenseifner . . . . . . . . . .. email rabenseifner at hlrs.de
High Performance Computing Center (HLRS) . phone ++49(0)711/685-65530
University of Stuttgart . . . . . . . . .. fax ++49(0)711 / 685-65832
Head of Dpmt Parallel Computing . . . www.hlrs.de/people/rabenseifner
Nobelstr. 19, D-70550 Stuttgart, Germany . . . . (Office: Room 1.307)
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