[MPIWG Fortran] F08 and pair types?

[Rolf Rabenseifner]

Sorry, but I was too fast with my negative answer.
Yes, we have both arguments in the reduction
and therefore it would be simple to add a new
datatype to the list of allowed datatypes for 
MIN/MAXLOC in Fortran.

Deprecation is too expensive and there is no need.

Rolf


----- Original Message -----
> From: "Rolf Rabenseifner" <rabenseifner at hlrs.de>
> To: "MPI-WG Fortran working group" <mpiwg-fortran at lists.mpi-forum.org>
> Sent: Tuesday, December 8, 2015 7:22:45 PM
> Subject: Re: [MPIWG Fortran] F08 and pair types?

> I'm sorry, but I expect that deprecation of a language binding
> is not possible for a feature that is still valid in other languages (here C).
> 
> This means, that MINLOC and MAXLOC are as they are defined
> and there is no reason to deprecate them.
> They are not wrong and nobody want to pay the maintenance costs
> for modifying existing applications that use MIN/MAXLOC.
> 
> The only way to do it better, is to add a new feature, e.g.,
> MINLOC_F08 and MAXLOC_F08 which is valid only for the new
> mpi_f08 module.
> 
> Rolf
> 
> ----- Original Message -----
>> From: "Craig Rasmussen" <rasmus at cas.uoregon.edu>
>> To: "MPI-WG Fortran working group" <mpiwg-fortran at lists.mpi-forum.org>
>> Sent: Tuesday, December 8, 2015 6:30:37 PM
>> Subject: Re: [MPIWG Fortran] F08 and pair types?
> 
>> The old stuff could be deprecated because all existing compilers that I know of
>> support user-defined types. I assume that "deprecated" means that it still
>> exists in libraries for legacy apps but is no longer really defined in the
>> standard.
>> 
>> -craig
>> 
>> On Tue, Dec 8, 2015 at 9:19 AM, Craig Rasmusen < rasmus at cas.uoregon.edu > wrote:
>> 
>> 
>> 
>> Fortran is a modern language? Wut...
>> 
>> Actually seems like a simple and good change. For example, could define:
>> 
>> MPI_REAL_INT and MPI_INTEGER_INT
>> 
>> However, I'm not sure what would be in the structs (user-defined types). I'll
>> have to ask Squyres what the text following
>> 
>> "The datatype MPI_FLOAT_INT is as if defined by the following sequence of
>> instructions"
>> 
>> means.
>> 
>> -craig
>> 
>> On Mon, Dec 7, 2015 at 4:20 PM, Jeff Hammond < jeff.science at gmail.com > wrote:
>> 
>> 
>> 
>> I have a reasonable understanding of why the legacy Fortran bindings use 2REAL,
>> 2DOUBLE_PRECISION and 2INTEGER with {MAX,MIN}LOC reductions.
>> 
>> Doesn't modern Fortran provide a way to create struct-like things along the
>> lines of C, such that more appropriate pair types could be used for these?
>> 
>> The relevant text is section 5.9.4 of MPI 3.1.
>> 
>> Jeff
>> 
>> --
>> Jeff Hammond
>> jeff.science at gmail.com
>> http://jeffhammond.github.io/
>> 
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>> 
>> 
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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: Room 1.307)
> _______________________________________________
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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: Room 1.307)