December 2014 - mpi-forum - mailman3.cels.anl.gov

Re: [Mpi-forum] Please send me your slides
by Jeff Squyres (jsquyres) 16 Dec '14

16 Dec '14

Got them; thanks. On Dec 16, 2014, at 9:47 AM, Jim Dinan <james.dinan(a)gmail.com> wrote: > Slides attached. > > ~Jim. > > On Wed, Dec 10, 2014 at 7:00 PM, Jeff Squyres (jsquyres) <jsquyres(a)cisco.com> wrote: > If you presented any slides this week, please send them to me. Thanks. > > -- > Jeff Squyres > jsquyres(a)cisco.com > For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/ > > _______________________________________________ > mpi-forum mailing list > mpi-forum(a)lists.mpi-forum.org > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum > <Hybrid Plenary -- EP-Lib.pdf>_______________________________________________ > mpi-forum mailing list > mpi-forum(a)lists.mpi-forum.org > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum -- Jeff Squyres jsquyres(a)cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/

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Re: [Mpi-forum] Please send me your slides
by Jim Dinan 16 Dec '14

16 Dec '14

Slides attached. ~Jim. On Wed, Dec 10, 2014 at 7:00 PM, Jeff Squyres (jsquyres) <jsquyres(a)cisco.com > wrote: > > If you presented any slides this week, please send them to me. Thanks. > > -- > Jeff Squyres > jsquyres(a)cisco.com > For corporate legal information go to: > http://www.cisco.com/web/about/doing_business/legal/cri/ > > _______________________________________________ > mpi-forum mailing list > mpi-forum(a)lists.mpi-forum.org > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum >

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Re: [Mpi-forum] behavior of NBC for intracommunicators when root == MPI_PROC_NULL
by Anthony Skjellum 11 Dec '14

11 Dec '14

A communication that does nothing is not the same as the initialization value of the type. It makes a non-unique mapping of operations to handles too, for no good reason. Imagine that I start my array with MPI_REQUEST_NULL as the default value. Now I can have some of those in the middle of my array even though this is an actual (albeit empty) communication. I have to distinguish now between MPI_REQUEST_NULL being generated because the work was trivial, vs. because of an uninitialized array element. What if I want to test this request too? Does it return completed? :-) I think there is a subtle semantic difference between "a no work operation" and MPI_REQUEST_NULL. We need to look at all the possible dark corners of what can happen by the literal mapping. I will go re-read 5.2.3 next. Its just my opinion, it may be that we decide I am overly worried about a small edge condition. Tony Anthony Skjellum, PhD Professor of Computer Science and Software Engineering COLSA Professor of Cybersecurity and Information Assurance Director of the Auburn Cyber Research Center and Lead Cyber Scientist for Auburn Samuel Ginn College of Engineering Auburn University skjellum(a)auburn.edu or skjellum(a)gmail.com cell: +1-205-807-4968 ; office: +1-334-844-6360 CONFIDENTIALITY: This e-mail and any attachments are confidential and may be privileged. If you are not a named recipient, please notify the sender immediately and do not disclose the contents to another person, use it for any purpose or store or copy the information in any medium. ________________________________ From: mpi-forum [mpi-forum-bounces(a)lists.mpi-forum.org] on behalf of George Bosilca [bosilca(a)icl.utk.edu] Sent: Thursday, December 11, 2014 4:50 PM To: Main MPI Forum mailing list Subject: Re: [Mpi-forum] behavior of NBC for intracommunicators when root == MPI_PROC_NULL What's wrong with 5.2.3? From a practical point of view, returning MPI_REQUEST_NULL makes sense (following the description about communication with MPI_PROC_NULL from 3.11). George. On Thu, Dec 11, 2014 at 5:22 PM, Anthony Skjellum <skjellum(a)auburn.edu<mailto:[email protected]>> wrote: Shouldn't it just be a trivial request -- why map to null ? - shortcut should of course happen internally but the request should be valid --- undesirable side effects possible Imho with a literal mapping ! Anthony Skjellum, PhD 205-807-4968<tel:205-807-4968> > On Dec 11, 2014, at 3:30 PM, Jeff Hammond <jeff.science(a)gmail.com<mailto:[email protected]>> wrote: > > I would hope that the Ianything is matched with a corresponding > Test/Wait* call on every process that calls it. To allow otherwise > seems pretty odd. > > Presumably, if Ibcast is a no-op when root=MPI_PROC_NULL, then the > request can be set to MPI_REQUEST_NULL and thus completing it is > trivial. > > If the standard says that completing a request known to be > MPI_REQUEST_NULL is not required, then I suppose the user can avoid > making the completion call, but I don't like that style. > > Jeff > >> On Thu, Dec 11, 2014 at 11:30 AM, Fab Tillier <ftillier(a)microsoft.com<mailto:[email protected]>> wrote: >> Hi Folks, >> >> >> >> I can’t find anything in the standard document that explains the behavior >> for NBC requests on intercommunicators when root == MPI_PROC_NULL. Taking >> MPI_Ibcast as an example, what is the output value of request? Is it >> MPI_REQUEST_NULL? Is it not set at all? Is it a valid request that must be >> completed? >> >> >> >> Thanks, >> >> -Fab >> >> >> _______________________________________________ >> mpi-forum mailing list >> mpi-forum(a)lists.mpi-forum.org<mailto:[email protected]> >> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum > > > > -- > Jeff Hammond > jeff.science(a)gmail.com<mailto:[email protected]> > http://jeffhammond.github.io/ > _______________________________________________ > mpi-forum mailing list > mpi-forum(a)lists.mpi-forum.org<mailto:[email protected]> > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum _______________________________________________ mpi-forum mailing list mpi-forum(a)lists.mpi-forum.org<mailto:[email protected]> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum

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Re: [Mpi-forum] Sep. 2015 Forum
by Martin Schulz 11 Dec '14

11 Dec '14

Hi all, We had this discussion yesterday at the MPI forum, but I wanted to get confirmation from Guillaume first before sending this out to everyone (which I got earlier today). Following the overwhelming vote of the forum yesterday, we¹ll have the MPI forum right after the EuroMPI conference. The conference is scheduled to end on Thursday 9/24 at noon and the forum will pick up after a lunch break and will run until Saturday 9/26 in the evening. Thanks to the team at INRIA for making this possible and hosting us also on the weekend! The forum webpage is updated and should refresh shortly. Thanks, Martin On 12/11/14, 2:48 PM, "Brice Goglin" <Brice.Goglin(a)inria.fr> wrote: >Yes, we (Inria Bordeaux) were waiting for the forum dates before >deciding/displaying the final Euro MPI dates within these 5 days. > >Brice > > > >Le 11/12/2014 23:41, Balaji, Pavan a écrit : >> In the discussion at the Forum we were considering Euro MPI as a 4-day >>conference, but the website says 5 days (21-25): >> >> https://eurompi2015.bordeaux.inria.fr >> >> I assume this is temporary in order to get potential attendees to block >>the full range of dates, but sending this email out to make sure. Can >>Martin (or whoever is coordinating with the Euro MPI folks) confirm? >> >> -- Pavan >> >> Sent from my iPhone >> _______________________________________________ >> mpi-forum mailing list >> mpi-forum(a)lists.mpi-forum.org >> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum > >_______________________________________________ >mpi-forum mailing list >mpi-forum(a)lists.mpi-forum.org >http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum

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Re: [Mpi-forum] behavior of NBC for intracommunicators when root == MPI_PROC_NULL
by George Bosilca 11 Dec '14

11 Dec '14

What's wrong with 5.2.3? From a practical point of view, returning MPI_REQUEST_NULL makes sense (following the description about communication with MPI_PROC_NULL from 3.11). George. On Thu, Dec 11, 2014 at 5:22 PM, Anthony Skjellum <skjellum(a)auburn.edu> wrote: > Shouldn't it just be a trivial request -- why map to null ? - shortcut > should of course happen internally but the request should be valid --- > undesirable side effects possible Imho with a literal mapping ! > > Anthony Skjellum, PhD > 205-807-4968 > > > > On Dec 11, 2014, at 3:30 PM, Jeff Hammond <jeff.science(a)gmail.com> > wrote: > > > > I would hope that the Ianything is matched with a corresponding > > Test/Wait* call on every process that calls it. To allow otherwise > > seems pretty odd. > > > > Presumably, if Ibcast is a no-op when root=MPI_PROC_NULL, then the > > request can be set to MPI_REQUEST_NULL and thus completing it is > > trivial. > > > > If the standard says that completing a request known to be > > MPI_REQUEST_NULL is not required, then I suppose the user can avoid > > making the completion call, but I don't like that style. > > > > Jeff > > > >> On Thu, Dec 11, 2014 at 11:30 AM, Fab Tillier <ftillier(a)microsoft.com> > wrote: > >> Hi Folks, > >> > >> > >> > >> I can’t find anything in the standard document that explains the > behavior > >> for NBC requests on intercommunicators when root == MPI_PROC_NULL. > Taking > >> MPI_Ibcast as an example, what is the output value of request? Is it > >> MPI_REQUEST_NULL? Is it not set at all? Is it a valid request that > must be > >> completed? > >> > >> > >> > >> Thanks, > >> > >> -Fab > >> > >> > >> _______________________________________________ > >> mpi-forum mailing list > >> mpi-forum(a)lists.mpi-forum.org > >> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum > > > > > > > > -- > > Jeff Hammond > > jeff.science(a)gmail.com > > http://jeffhammond.github.io/ > > _______________________________________________ > > mpi-forum mailing list > > mpi-forum(a)lists.mpi-forum.org > > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum > _______________________________________________ > mpi-forum mailing list > mpi-forum(a)lists.mpi-forum.org > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum >

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Re: [Mpi-forum] Sep. 2015 Forum
by Brice Goglin 11 Dec '14

11 Dec '14

Yes, we (Inria Bordeaux) were waiting for the forum dates before deciding/displaying the final Euro MPI dates within these 5 days. Brice Le 11/12/2014 23:41, Balaji, Pavan a ï¿½crit : > In the discussion at the Forum we were considering Euro MPI as a 4-day conference, but the website says 5 days (21-25): > > https://eurompi2015.bordeaux.inria.fr > > I assume this is temporary in order to get potential attendees to block the full range of dates, but sending this email out to make sure. Can Martin (or whoever is coordinating with the Euro MPI folks) confirm? > > -- Pavan > > Sent from my iPhone > _______________________________________________ > mpi-forum mailing list > mpi-forum(a)lists.mpi-forum.org > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum

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Sep. 2015 Forum
by Balaji, Pavan 11 Dec '14

11 Dec '14

In the discussion at the Forum we were considering Euro MPI as a 4-day conference, but the website says 5 days (21-25): https://eurompi2015.bordeaux.inria.fr I assume this is temporary in order to get potential attendees to block the full range of dates, but sending this email out to make sure. Can Martin (or whoever is coordinating with the Euro MPI folks) confirm? -- Pavan Sent from my iPhone

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Re: [Mpi-forum] behavior of NBC for intracommunicators when root == MPI_PROC_NULL
by Anthony Skjellum 11 Dec '14

11 Dec '14

Shouldn't it just be a trivial request -- why map to null ? - shortcut should of course happen internally but the request should be valid --- undesirable side effects possible Imho with a literal mapping ! Anthony Skjellum, PhD 205-807-4968 > On Dec 11, 2014, at 3:30 PM, Jeff Hammond <jeff.science(a)gmail.com> wrote: > > I would hope that the Ianything is matched with a corresponding > Test/Wait* call on every process that calls it. To allow otherwise > seems pretty odd. > > Presumably, if Ibcast is a no-op when root=MPI_PROC_NULL, then the > request can be set to MPI_REQUEST_NULL and thus completing it is > trivial. > > If the standard says that completing a request known to be > MPI_REQUEST_NULL is not required, then I suppose the user can avoid > making the completion call, but I don't like that style. > > Jeff > >> On Thu, Dec 11, 2014 at 11:30 AM, Fab Tillier <ftillier(a)microsoft.com> wrote: >> Hi Folks, >> >> >> >> I can’t find anything in the standard document that explains the behavior >> for NBC requests on intercommunicators when root == MPI_PROC_NULL. Taking >> MPI_Ibcast as an example, what is the output value of request? Is it >> MPI_REQUEST_NULL? Is it not set at all? Is it a valid request that must be >> completed? >> >> >> >> Thanks, >> >> -Fab >> >> >> _______________________________________________ >> mpi-forum mailing list >> mpi-forum(a)lists.mpi-forum.org >> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum > > > > -- > Jeff Hammond > jeff.science(a)gmail.com > http://jeffhammond.github.io/ > _______________________________________________ > mpi-forum mailing list > mpi-forum(a)lists.mpi-forum.org > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum

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Re: [Mpi-forum] behavior of NBC for intracommunicators when root == MPI_PROC_NULL
by Jeff Hammond 11 Dec '14

11 Dec '14

I would hope that the Ianything is matched with a corresponding Test/Wait* call on every process that calls it. To allow otherwise seems pretty odd. Presumably, if Ibcast is a no-op when root=MPI_PROC_NULL, then the request can be set to MPI_REQUEST_NULL and thus completing it is trivial. If the standard says that completing a request known to be MPI_REQUEST_NULL is not required, then I suppose the user can avoid making the completion call, but I don't like that style. Jeff On Thu, Dec 11, 2014 at 11:30 AM, Fab Tillier <ftillier(a)microsoft.com> wrote: > Hi Folks, > > > > I can’t find anything in the standard document that explains the behavior > for NBC requests on intercommunicators when root == MPI_PROC_NULL. Taking > MPI_Ibcast as an example, what is the output value of request? Is it > MPI_REQUEST_NULL? Is it not set at all? Is it a valid request that must be > completed? > > > > Thanks, > > -Fab > > > _______________________________________________ > mpi-forum mailing list > mpi-forum(a)lists.mpi-forum.org > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum -- Jeff Hammond jeff.science(a)gmail.com http://jeffhammond.github.io/

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behavior of NBC for intracommunicators when root == MPI_PROC_NULL
by Fab Tillier 11 Dec '14

11 Dec '14

Hi Folks, I can't find anything in the standard document that explains the behavior for NBC requests on intercommunicators when root == MPI_PROC_NULL. Taking MPI_Ibcast as an example, what is the output value of request? Is it MPI_REQUEST_NULL? Is it not set at all? Is it a valid request that must be completed? Thanks, -Fab

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