[Mpi-forum] Did we screw up the const bindings in MPI-3?

[Marc-Andre Hermanns]

Hi Martin,

> I haven't tried it with PnMPI (I'll try to do that before the meeting
> in San Jose), but we scan the mpi.h file. We have found this
> generally to be a good idea, since not always all routines are
> implemented and the tool works for MPI-1 and MPI-2 alike.

In Scalasca and Score-P, we inspect the MPI library for the presence 
each PMPI symbol and then we only create wrappers for those calls where 
we found valid PMPI symbols. (When the prototypes are mangle, this would 
definitely need to be adapted.)

The prototypes are predefined in an XML file. There, we also define 
additional attributes, such as whether a parameter in "input, output, or 
both".

> From a tools community point of view it would be good to come with
> such a wrapper generator once and then have everyone use it, which
> would not only eliminate this issue, but also make the Fortran issue
> much simpler.

As different tools groups might have different interests, it would be 
quite an undertaking. Still, it would definitely be good not to reinvent 
the wheel several times.

> The tools WG is planing to have a discussion in San Jose on whether
> we can create such a wrapper infrastructure that actually produces
> Fortran implementations along with the C implementations, which may
> make the whole symbol naming issue unnecessary. Adding a C version to
> such a wrapper system would be trivial.

Unfortunately, I won't be in San Jose. Maybe I'll prime someone (Martin? 
Kathryn?) with what our wrapper generator can and cannot do, as input 
into the discussion?

Cheers,
Marc-Andre

PS: Should we move this discussion to the tools mailing list?
-- 
Marc-Andre Hermanns
German Research School for
Simulation Sciences GmbH
c/o Laboratory for Parallel Programming
52062 Aachen | Germany

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