No, we didn't have them. The request to provide all C datatypes in Fortran was specified in one of the last meetings. When I remember correctly, it was specified in the last meeting in Chicago or the meeting before (I think it was specified together with item 33 of the change log). I implemented it together with the changes for MPI 2.1 since I assumed that it was contained also in the change log. After your mail, I recognized that it is only implicitly mentioned by item 33. Hubert Jeff Squyres wrote:

What does NEC MPI do -- do you have MPI_INT and MPI_FLOAT (etc.) in mpif.h?

On Jul 16, 2008, at 12:57 PM, Hubert Ritzdorf wrote:

...

What's about the C++ datatypes for complex ? MPI_COMPLEX and MPI_Double_Complex are already defined for Fortran datatypes. The complex Fortran datatypes within C++ have a special name in order to avoid a name collision.

Hubert

William Gropp wrote:

...

One piece of relevant text in MPI 2.0 is in section 4.12.6 (in MPI-2.0) says that "All predefined datatypes can be used in datatype constructors in any language." However, the example uses MPI_Type_f2c ton convert the Fortran handle to the C version before passing it into the MPI_Type_create_struct routine, so this text could be interpreted as allowing the use of those datatypes through the handle conversion mechanism without requiring them to be defined in each languages header file. Presumably the requirement is that they be predefined with the value that you'd get from the handle conversion function?

Bill

On Jul 16, 2008, at 8:18 AM, Hubert Ritzdorf wrote:

...

Hi,

when I remember correctly, it was decided to provide the C MPI datatypes in Fortran since the Fortran datatypes are supported in C and C++.

Hubert

Jeff Squyres wrote:

...

I will file a proposal about this if there is a problem, but I wanted to ask the group before I did so. In the changelog for MPI-2.1:

2. Section 3.2.2 on page 27, Section 16.1.6 on page 453, and Annex A.1 on page 491. MPI_LONG_LONG_INT, MPI_LONG_LONG (as synonym), MPI_UNSIGNED_LONG_LONG, MPI_SIGNED_CHAR, and MPI_WCHAR are moved from optional to official and they are therefore defined for all three language bindings.

Note that it says that these C datatype names must be in all three language bindings.

Are C MPI datatypes supposed to be available in Fortran? I looked in mpif.h for Open MPI, MPICH2, HP MPI, and Intel MPI, and I didn't see C MPI datatypes in there (e.g., MPI_INT and MPI_FLOAT).

So:

- is there language somewhere in MPI that says that C datatypes are not supposed to be in mpif.h? (and therefore the MPI-2.1 changelog is wrong)

or

- are all 4 of the above MPI's wrong for not including the C datatypes in mpif.h?

--Jeff Squyres Cisco Systems

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William Gropp Paul and Cynthia Saylor Professor of Computer Science University of Illinois Urbana-Champaign

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