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 [email protected] http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum

-- Pavan Balaji http://www.mcs.anl.gov/~balaji _______________________________________________ mpi-forum mailing list [email protected] http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum

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