[MPIWG Fortran] MPI-3 ticket 349: Fortran question

[Jim Dinan]

Hi Rolf,

Thank you very much for the feedback!  Sorry if I forgot to respond; the
comments definitely were not ignored.  We discussed the Aint difference
calculation in the working group and decided to create an additional ticket
for MPI_Aint_disp.  We did not see a clean way to handle this in
MPI_Aint_add, because both arguments need to be handled as unsigned in the
arithmetic.

https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/404

I have a list of fixes the to the datatypes examples that I'll post to the
ticket soon.

Jeff Squyres is also helping us move the MPI_Aint arithmetic routines to
functions in the Fortran bindings.  Should be done today.

Were there any other concerns that we missed?

Thanks,
 ~Jim.


On Thu, Dec 12, 2013 at 1:42 AM, Rolf Rabenseifner <rabenseifner at hlrs.de>wrote:

> Jeff and Bill,
>
> <https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/349#comment:22>
> was ignored.
> The answer seems to be yes and the clear implication is that
> we need also a routine to calculate disp := addr2-addr1
>
> About the Fortran Interfaces:
> We should keep the old style without INTENT, because for the old-style
> the implementor has the freedom to add INTENT as he/she wants
> and it is still compliant with the outcome of the definition.
>
> I do not see, why we have a function in C and a subroutine
> in Fortran.
> Like MPI_Wtime, in all three languages (C, new and old Fortran),
> we should do the same.
>
> Best regards
> Rolf
>
> ----- Original Message -----
> > From: "Jeff Squyres (jsquyres)" <jsquyres at cisco.com>
> > To: "<longb at cray.com>" <longb at cray.com>, "MPI-WG Fortran working group"
> <mpiwg-fortran at lists.mpi-forum.org>
> > Sent: Thursday, December 12, 2013 12:17:40 AM
> > Subject: Re: [MPIWG Fortran] MPI-3 ticket 349: Fortran question
> >
> > Sounds good to me.
> >
> > Rolf -- is there any MPI reason we would not want to do this?
> >
> >
> > On Dec 11, 2013, at 4:41 PM, Bill Long <longb at cray.com> wrote:
> >
> > >
> > >
> > > On 12/11/13 11:27 AM, Jeff Squyres (jsquyres) wrote:
> > >> This ticket got a formal reading today at the Forum:
> > >>
> > >>     http://svn.mpi-forum.org/trac/mpi-forum-web/ticket/349
> > >>     (as of this writing, there's still a BIND(C) in there, but it
> > >>     will be removed shortly)
> > >>
> > >> The function is basically intended to perform a mathematical
> > >> operation.  As such, I think that the 2 Fortran bindings should
> > >> be FUNCTIONs, not SUBROUTINEs (a la MPI_WTICK/MPI_WTIME).
> > >>
> > >> Do you agree?  If so, the ticket author (Jim Dinan) is amenable to
> > >> changing the Fortran bindings to the following (and I'm assuming
> > >> I have the syntax below correct, but feel free to correct me if
> > >> they're wrong):
> > >>
> > >
> > > Certainly it makes more sense for these to be functions in Fortran.
> > > Particularly if the programmer prefers supply an interface and
> > > call the C form directly.  If the C and Fortran versions are both
> > > functions, there is no change in the source code where the
> > > function is used.
> > >
> > >> -----
> > >> INTEGER(KIND=MPI_ADDRESS_KIND) MPI_Aint_add(base, disp)
> > >>     INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(IN) ::  base, disp
> > >>
> > >> INTEGER(KIND=MPI_ADDRESS_KIND) MPI_AINT_ADD(BASE, DISP)
> > >>     INTEGER(KIND=MPI_ADDRESS_KIND) BASE, DISP
> > >
> > > It is certainly an oddity that the spec has two forms like this.
> > >  Any version of the Fortran standard that supports KIND= in
> > > INTEGER also supports lower case names and INTENT() attributes.
> > >   Maybe there could be some clean up of this in a future revision.
> > >
> > > Cheers,
> > > Bill
> > >
> > >
> > >
> > >> -----
> > >>
> > >
> > > --
> > > Bill Long                                           longb at cray.com
> > > Fortran Technical Support    &                 voice: 651-605-9024
> > > Bioinformatics Software Development            fax:   651-605-9142
> > > Cray Inc./Cray Plaza, Suite 210/380 Jackson St./St. Paul, MN 55101
> > >
> > >
> > > _______________________________________________
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> > > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-fortran
> >
> >
> > --
> > Jeff Squyres
> > jsquyres at cisco.com
> > For corporate legal information go to:
> > http://www.cisco.com/web/about/doing_business/legal/cri/
> >
> > _______________________________________________
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> > mpiwg-fortran at lists.mpi-forum.org
> > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-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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