[Mpi3-tools] MPI 3.0: Fortran 2008 interface - issue with the LOGICAL kind
rabenseifner at hlrs.de
Wed Apr 17 12:09:59 CDT 2013
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.
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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