Sure, I can be there. Thanks!

On Aug 29, 2019, at 11:05 AM, Marc-André Hermanns via mpiwg-tools <[email protected]> wrote:

Hi Jeff,

sorry about the silence. As Martin already said, your mail led to some internal discussion and we wanted to reach out beyond the tools people on the mailing list because it seems no-one on the list is currently able to handle Fortran descriptors, but we failed to keep you informed.

Would you be available on *Sep 19* for the tools call? That would give us some time to contact some people outside the working group and they'd have time to either give feedback or organize their schedules in a way to attend the call.

Cheers, Marc-Andre

On 29.08.19 16:53, Martin Schulz via mpiwg-tools wrote:

...

Hi Jeff,

Due to the summer break and vacation time, especially in Europe, we haven’t had a chance to address this - Marc-Andre had suggested a tools call on this for after EuroMPI and then we’ll know more (we need to get tool implementors to the table who are not part of the WG).

Personally, though, I fear you are right with your assumption, but I am happy to be proven wrong.

Martin

— Prof. Dr. Martin Schulz, Chair of Computer Architecture and Parallel Systems Department of Informatics, TU-Munich, Boltzmannstraße 3, D-85748 Garching Member of the Board of Directors at the Leibniz Supercomputing Centre (LRZ) Email: [email protected] <mailto:[email protected]>

...

On 29. Aug 2019, at 16:46, Jeff Squyres (jsquyres) via mpiwg-tools <[email protected] <mailto:[email protected]>> wrote:

Should I infer from the lack of reply that no tools properly handle either Fortran descriptors or the descriptor-based symbols?

...

On Aug 25, 2019, at 11:31 AM, Jeff Squyres (jsquyres) via mpiwg-tools <[email protected] <mailto:[email protected]>> wrote:

In Open MPI, we are finally working towards supporting Fortran descriptors for choice buffers (i.e., "TYPE(*), DIMENSION(..)").

Per MPI-3.1 p613 table 17.1, this means ***changing all the back-end symbols*** that are used for PMPI-style interception.

A concrete example:

- in mpif.h / the mpi module, MPI_SEND will become MPI_SEND_FTS - in the mpi_f08 module, MPI_SEND will become MPI_SEND_F08TS

I.e., anywhere the application calls MPI_SEND, it will be transmogrified to either MPI_SEND_FTS or MPI_SEND_F08TS. And the choice buffer passed will be a descriptor (which may therefore be a subarray, not a contiguous buffer), not a naked pointer.

Here's my questions:

1. Do any tools support Fortran descriptors as choice buffers? 2. Do any tools intercept the symbols as described in MPI-3.1 table 17.1?

-- Jeff Squyres [email protected] <mailto:[email protected]>

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-- Jeff Squyres [email protected] <mailto:[email protected]>

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-- Dr. rer. nat. Marc-André Hermanns

IT Center Group: High Performance Computing Division: Computational Science and Engineering RWTH Aachen University Seffenter Weg 23 52074 Aachen Phone: +49 241 80-24381 [email protected] www.itc.rwth-aachen.de

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-- Jeff Squyres [email protected]