[mpiwg-tools] Questions for the tools community

Jeff Squyres (jsquyres) jsquyres at cisco.com
Tue Sep 17 07:53:52 CDT 2019 

Pushing to Thursday 26 Sep works for me.

Sorry for the schedule complications!


> On Sep 17, 2019, at 8:37 AM, Mohror, Kathryn <mohror1 at llnl.gov> wrote:
> 
> Hi Marc-Andre,
> 
> Pushing to a later Thursday is fine with me. I am not aware of any other tools people that are planning to join this coming Thursday.
> 
> Kathryn
> 
> -----Original Message-----
> From: mpiwg-tools <mpiwg-tools-bounces at lists.mpi-forum.org> On Behalf Of Marc-André Hermanns via mpiwg-tools
> Sent: Monday, September 16, 2019 11:46 PM
> To: Jeff Squyres (jsquyres) <jsquyres at cisco.com>; MPI Tool WG <mpiwg-tools at lists.mpi-forum.org>; William Williams <william.williams at mailbox.tu-dresden.de>
> Cc: Marc-André Hermanns <hermanns at itc.rwth-aachen.de>
> Subject: Re: [mpiwg-tools] Questions for the tools community
> 
> Hi Jeff,
> 
> sorry for the delay in responding to your email.
> 
> As Martin also has some conflicts for this upcoming Thursday, we had the idea to push this to another week. How would that work for you?
> 
> @Kathryn: Do you know from anyone at LLNL or other US sites who planned to come, who we need to inform if we shift to another week?
> I put Bill Williams (from TU Dresden) in CC, as he initially planned to join as well.
> 
> If shifting the topic to a later date doesn't work out for you, you can certainly sync up with me, but I think first-hand information is always best in a discussion and it's always a pleasure to have you on the call ;-)
> 
> Cheers,
> Marc-Andre
> 
> On 16.09.19 15:05, Jeff Squyres (jsquyres) wrote:
>> Something changed and I'm sorry, I can't be there this Thursday.  I'm sorry!
>> 
>> Can I sync up with someone before Thursday to explain what I'm asking about?
>> 
>> 
>>> On Aug 29, 2019, at 11:25 AM, Jeff Squyres (jsquyres) <jsquyres at cisco.com> wrote:
>>> 
>>> 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
>>>>> 
>>>>> 
>>>>> _______________________________________________
>>>>> mpiwg-tools mailing list
>>>>> mpiwg-tools at lists.mpi-forum.org
>>>>> https://lists.mpi-forum.org/mailman/listinfo/mpiwg-tools
>>>>> 
>>>> 
>>>> --
>>>> 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
>>>> 
>>>> _______________________________________________
>>>> 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
>>> 
>> 
>> 
> 
> --
> 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
> 


-- 
Jeff Squyres
jsquyres at cisco.com

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