[mpiwg-tools] Questions for the tools community

[Jeff Squyres (jsquyres)]

Sure, I can be there.

Thanks!


> On Aug 29, 2019, at 11:05 AM, Marc-André Hermanns via mpiwg-tools <mpiwg-tools at lists.mpi-forum.org> 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: schulzm at in.tum.de <mailto:schulzm at in.tum.de>
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>>> On 29. Aug 2019, at 16:46, Jeff Squyres (jsquyres) via mpiwg-tools
>>> <mpiwg-tools at lists.mpi-forum.org
>>> <mailto:mpiwg-tools at lists.mpi-forum.org>> 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 <mpiwg-tools at lists.mpi-forum.org
>>>> <mailto:mpiwg-tools at lists.mpi-forum.org>> 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
>>>> jsquyres at cisco.com <mailto:jsquyres at cisco.com>
>>>> 
>>>> _______________________________________________
>>>> mpiwg-tools mailing list
>>>> mpiwg-tools at lists.mpi-forum.org
>>>> https://lists.mpi-forum.org/mailman/listinfo/mpiwg-tools
>>> 
>>> 
>>> -- 
>>> Jeff Squyres
>>> jsquyres at cisco.com <mailto:jsquyres at cisco.com>
>>> 
>>> _______________________________________________
>>> mpiwg-tools mailing list
>>> mpiwg-tools at lists.mpi-forum.org
>>> https://lists.mpi-forum.org/mailman/listinfo/mpiwg-tools
>> 
>> 
>> _______________________________________________
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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
> hermanns at itc.rwth-aachen.de
> www.itc.rwth-aachen.de
> 
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-- 
Jeff Squyres
jsquyres at cisco.com