[Mpi-forum] Reserved MPI_ prefix & namespace in C and Fortran

Fri Aug 24 12:02:33 CDT 2012

Bronis,
Yes, my erratum must also fix MPI-2.2 2.6.4 p18:40-41
in the same way as C.

I added it below.
Rolf

----- Original Message -----
> From: "Bronis R. de Supinski" <bronis at llnl.gov>
> To: "Main MPI Forum mailing list" <mpi-forum at lists.mpi-forum.org>
> Sent: Friday, August 24, 2012 6:38:57 PM
> Subject: Re: [Mpi-forum] Reserved MPI_ prefix & namespace in C and Fortran
> I'm not a C++ expert but my understanding is that "MPI_"
> is not all that you want reserved there. I think you also
> what to reserve "MPI::". Does it matter?
> 
> On Fri, 24 Aug 2012, Rolf Rabenseifner wrote:
> 
> > Bill,
> >
> > good idea. I try it; what about
> >
> > C:
> >>>   "Programs must not declare
> >       names (identifiers), e.g., for variables, functions,
> >       constants, macros, types, or namespaces,
> >>>    beginning with the prefix MPI_."
> >
> > Fortran:
> >>>   "Programs must not declare
> >       names, e.g., for variables, parameters, functions,
> >       derived types, or abstract interfaces,
> >>>    beginning with the prefix MPI_.

C++
>       "Programs must not declare
          names (identifiers), e.g., for variables, functions,
          constants, macros, types, 
>        in the namespace MPI."

> >
> > Rolf
> >
> >
> > ----- Original Message -----
> >> From: "William Gropp" <wgropp at illinois.edu>
> >> To: "Main MPI Forum mailing list" <mpi-forum at lists.mpi-forum.org>
> >> Sent: Friday, August 24, 2012 6:05:38 PM
> >> Subject: Re: [Mpi-forum] Reserved MPI_ prefix & namespace in C and
> >> Fortran
> >> The intent of the Forum has always been that all names that begin
> >> with
> >> MPI_ or PMPI_, and the MPI namespace, are reserved for MPI. The
> >> mistake (a common one) was to attempt to enumerate all of the items
> >> to
> >> which this applies. Rather than attempt to cover everything, I
> >> would
> >> prefer changing the text to match the indent; it can mention
> >> specific
> >> categories as examples but should not attempt to list them, as this
> >> is
> >> always error prone.
> >>
> >> Bill
> >>
> >> William Gropp
> >> Director, Parallel Computing Institute
> >> Deputy Director for Research
> >> Institute for Advanced Computing Applications and Technologies
> >> Paul and Cynthia Saylor Professor of Computer Science
> >> University of Illinois Urbana-Champaign
> >>
> >>
> >>
> >> On Aug 24, 2012, at 10:31 AM, Rolf Rabenseifner wrote:
> >>
> >>> Dear all,
> >>>
> >>> Jeremiah detected a very old inconsistency in the MPI standard:
> >>>
> >>>> On page 19 line 14, the restriction on use of MPI_* names should
> >>>> also
> >>>> apply to preprocessor macros, namespaces in C++, types, and other
> >>>> things.
> >>>
> >>> In MPI-2.2, it was page 18, lines 15-16:
> >>>
> >>>   "Programs must not declare variables or functions
> >>>    with names beginning with the prefix MPI_."
> >>>
> >>> Together with MPI-2.2 p4:26
> >>>
> >>>   "Any correct MPI-2.1 program is a correct MPI-2.2 program."
> >>>
> >>> and the new constant declaration on p258:17: MPI_DIST_GRAPH,
> >>> the implication is that the MPI standard is inconsistent.
> >>>
> >>> The solution is very simple, an MPI-2 errata ticket changing
> >>> MPI-2.2, lines 15-16 into (addition marked with {...}):
> >>>
> >>>   "Programs must not declare variables, functions,
> >>>    { constants, macros, types, or namespaces }
> >>>    with names beginning with the prefix MPI_."
> >>>
> >>> And for Fortran on p17:41-42 (addition marked with {...}):
> >>>
> >>>   "Programs must not declare variables, parameters, functions,
> >>>    { derived types, or abstract interfaces }
> >>>    with names beginning with the prefix MPI_.
> >>>
> >>> It should be a single reading+vote errata ticket, because it does
> >>> not change the standard, it only makes it obvious.
> >>> The reservation was in MPI-2.1 in fact already there through the
> >>> sentence
> >>>
> >>>   "Any correct MPI-2.1 program is a correct MPI-2.2 program."
> >>>
> >>> because nobody could foresee, which new things we will
> >>> have added to MPI-2.2.
> >>>
> >>> Details are in ticket
> >>> https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/343
> >>>
> >>> And see markups ticket0.343 on page 11 in
> >>> https://svn.mpi-forum.org/trac/mpi-forum-web/attachment/ticket/343/ticket0.343-terms-2.pdf
> >>>
> >>> I hope that there is a broad consensus
> >>> to solve this inconsistency.
> >>>
> >>> Best regards
> >>> Rolf
> >>>
> >>>
> >>> ----- Original Message -----
> >>>> From: "Jeremiah Willcock" <jewillco at osl.iu.edu>
> >>>> To: mpi-comments at mpi-forum.org
> >>>> Sent: Sunday, August 19, 2012 2:13:41 AM
> >>>> Subject: [Mpi-comments] Comments on MPI 3.0 draft 2
> >>>> These are in reference to the draft at
> >>>> <URL:http://meetings.mpi-forum.org/mpi3.0_draft_2.pdf>. Thank you
> >>>> for
> >>>> considering them.
> >>>>
> >>>> -- Jeremiah Willcock
> >>> ...
> >>>> On page 19 line 14, the restriction on use of MPI_* names should
> >>>> also
> >>>> apply to preprocessor macros, namespaces in C++, types, and other
> >>>> things.
> >>>
> >>> --
> >>> 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: Allmandring
> >>> 30)
> >>> _______________________________________________
> >>> mpi-forum mailing list
> >>> mpi-forum at lists.mpi-forum.org
> >>> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum
> >>
> >>
> >> _______________________________________________
> >> mpi-forum mailing list
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> >> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum
> >
> > --
> > 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: Allmandring 30)
> > _______________________________________________
> > mpi-forum mailing list
> > mpi-forum at lists.mpi-forum.org
> > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum
> >
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-- 
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: Allmandring 30)