Hi Jeff, all, On Mar 21, 2013, at 8:38 AM, "Jeff Squyres (jsquyres)" <[email protected]> wrote:

On Mar 21, 2013, at 8:26 AM, Craig Rasmussen <[email protected]> wrote:

...

I talked with Martin yesterday and he would be happy to have the requirement in the standard that the Fortran wrappers MUST call the MPI C interface. This would much simplify things for the tools community. (I had earlier thought he would object to this solution.)

No! This is NOT a good idea to mandate.

Open MPI currently has a bunch of Fortran functions that do NOT call the corresponding MPI_<foo> C function. Instead, they call some other back-end, internal function.

I believe the NEC Fortran MPI API may do similar things.

I feared that this would be the reaction and that were also my original reservations. From a tools perspective this would indeed be the easiest and cleanest solution, but I can see the downside. Implementation effort for rewriting aside (which I realize is important), do you expect a large performance impact, though? Martin

-- Jeff Squyres [email protected] For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/

________________________________________________________________________ Martin Schulz, [email protected], http://people.llnl.gov/schulzm CASC @ Lawrence Livermore National Laboratory, Livermore, USA