On Mar 21, 2013, at 8:44 AM, "Schulz, Martin" <[email protected]> wrote:

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?

I can't speak for NEC. The reason we did it this was in OMPI was not for performance -- it was for implementation-specific reasons. That is, there are some cases where we want to do something different for the Fortran implementation vs. the C implementation. One obvious example of this is for just about any function involving callbacks. MPICH may not have this issue because their handles are always integers, but for OMPI, C handles=pointers/F handles=integers, so we have to do some swizzling/de-swizzling for the conversion. -- Jeff Squyres [email protected] For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/