[Mpi-forum] MPI_Type_create_struct vs. other datatype creation routines

[William Gropp]

Look at the Fortran binding - to create Fortran interfaces that used  
MPI_ADDRESS_KIND, we first had to *have* an MPI_ADDRESS_KIND, which is  
possible in Fortran 90 and later.  MPI-1 could only provide a Fortran  
77 binding.

Bill

On Aug 27, 2011, at 6:03 AM, Pavan Balaji wrote:

>
> No, that can't be right.
>
> MPI_Type_hindexed was in MPI-1, and it had MPI_Aint for displacement.
>
> MPI_Type_indexed on the other hand uses int.
>
> MPI_Type_struct in MPI-1 also used MPI_Aint.
>
> MPI_Type_create_indexed_block was added in MPI-2.1 (or 2.2?) and  
> uses int.
>
> It all seems arbitrary to me.
>
> -- Pavan
>
> On 08/27/2011 05:18 AM, Jeff Squyres wrote:
>> An offhand guess: TYPE_CREATE_STRUCT was created in MPI-2, whereas  
>> the rest were created in MPI-1.
>>
>>
>> On Aug 27, 2011, at 3:54 AM, Pavan Balaji wrote:
>>
>>>
>>> Is there a reason why MPI_Type_create_struct was given the special  
>>> privilege of using MPI_Aint to store displacements, while the  
>>> remaining datatype creation routines use int? This would  
>>> essentially disallow creation of a datatype as an offset to  
>>> MPI_BOTTOM.
>>>
>>> -- Pavan
>>>
>>> --
>>> Pavan Balaji
>>> http://www.mcs.anl.gov/~balaji
>>> _______________________________________________
>>> mpi-forum mailing list
>>> mpi-forum at lists.mpi-forum.org
>>> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum
>>
>>
>
> -- 
> Pavan Balaji
> http://www.mcs.anl.gov/~balaji
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> mpi-forum at lists.mpi-forum.org
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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