- mpiwg-sessions - mailman3.cels.anl.gov

Can I query a set even if I'm not in it?
by Bland, Wesley 26 Apr '16

26 Apr '16

Apologies if we’ve covered this and I’ve now forgotten, but it’s something that came up in the FTWG con call today. If I’m not in a set, am I still able to get the group it describes? An example is because the set names are easily serialized (because they’re strings), I could pass a set name around so that someone who wasn’t in the set could have access to it and therefore ask the runtime to create a group from it. In the group world, this is allowed: > Section 6.4.2 (MPI 3.1 p. 230 line 4-5) - … a process may also define a group that does not include itself. > This has advantages and disadvantages. The advantage is that we could do things like create inter-communicators without the bridge_comm as long as you have some other way of getting the set name. We decided on the last call that this was important. In the context of fault tolerance, it *might* be possible to do in-place replacement if we have the ability to touch all sets from anywhere (HUGE might there). The downside is that you have to be able to get the definition of any set from anywhere, which could have scalability issues (having to keep track of all the sets and how they overlap would be an O(p*s) problem, which we’re trying to avoid). Thanks, Wesley

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Notes from last week's meeting finally posted
by Bland, Wesley 25 Apr '16

25 Apr '16

Hi all, Sorry it took me so long to post the meeting notes from last week, but they’re finally on the wiki page: https://github.com/mpiwg-sessions/sessions-issues/wiki/2016-04-18-webex. I had a discussion with Jeff to convey the responses that we came up with during the call and he had some feedback that I’ve included. As always, feel free to make any corrections or complete any omissions. Thanks, Wesley

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MPI_TAG_UB / MPI_WTIME_IS_GLOBAL
by Jeff Squyres (jsquyres) 11 Apr '16

11 Apr '16

I'm back from vacation (it was great, thanks for asking!); Wesley and I just reviewed the meeting you guys had last week. I've pushed new notes and slides based on the meeting last week: https://github.com/mpiwg-sessions/sessions-issues/wiki/2016-04-18-webex - (session,fn,context) must be unique in the finalize hook addition --> therefore there's never any confusion about which one to delete --> I don't like the stack push/pop model because then one entity can't easily remove its own hook (i.e., it has to go find who is holding its (fn,context) tuple and replace it -- ick! Deleting a hook is infrastructure functionality; we should have it in the core API) - It seems like a minimum distance change to leave MPI_TAG_UB and MPI_WTIME_IS_GLOBAL as communicator attributes -- but specifically state that they will be defined on *all* communicators. Comments? (FYI: I also made a few changes in the later slides that you did not get to talk about in the 2016-04-04 meeting; the 2016-04-18 slides are now the definitive version for *all* slides) -- 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: [mpiwg-sessions] Slides posted to discuss next Monday
by Jim Dinan 08 Apr '16

08 Apr '16

Here's another presentation that's more recent: http://meetings.mpi-forum.org/secretary/2013/12/slides/jsquyres-init-finali… And one from way back: http://meetings.mpi-forum.org/secretary/2011/07/slides/ref-counted-init-fin… ~Jim. On Fri, Apr 8, 2016 at 10:41 AM, Jim Dinan <james.dinan(a)gmail.com> wrote: > Hi All, > > I was looking through past meeting materials today and came across a past > init/finalize presentation that Jeff gave. I don't think there's a need to > revisit this discussion, since we ultimately reached the conclusion that > init/finalize are wedged at their current semantics, but it could be > interesting background for anyone who is interested: > > > http://meetings.mpi-forum.org/secretary/2013/09/slides/jsquyres-init-finali… > > ~Jim. > > On Mon, Apr 4, 2016 at 3:01 PM, Bland, Wesley <wesley.bland(a)intel.com> > wrote: > >> Hi all, >> >> I’ve updated the wiki with notes from today’s sessions call. Thanks to >> all who contributed. If I missed anything, feel free to correct it. >> >> The plan for next week will be to pick up where we left off which will be >> slide 69, MPI_GET_WTIME_IS_GLOBAL. >> >> Thanks, >> Wesley >> >> > On Mar 31, 2016, at 12:01 PM, Jeff Squyres (jsquyres) < >> jsquyres(a)cisco.com> wrote: >> > >> > Sessions WG -- >> > >> > I have posted notes and slides to discuss for this upcoming Monday: >> > >> > - edits to old slides to clarify old questions >> > - several new slides to propose/address answers to bigger questions >> (e.g., COMM_SPAWN/COMM_PARENT, etc.) >> > >> > See: >> https://github.com/mpiwg-sessions/sessions-issues/wiki/2016-04-04-webex >> > >> > Regrettably, I am unable to join the call on Monday. I'll go over the >> proposed updates with Wesley before Monday; hopefully he'll be able to help >> guide the conversation. >> > >> > Please take good notes / minutes. Wesley and I will sync up after the >> meeting. >> > >> > -- >> > Jeff Squyres >> > jsquyres(a)cisco.com >> > For corporate legal information go to: >> http://www.cisco.com/web/about/doing_business/legal/cri/ >> > >> > _______________________________________________ >> > mpiwg-sessions mailing list >> > mpiwg-sessions(a)lists.mpi-forum.org >> > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-sessions >> >> _______________________________________________ >> mpiwg-sessions mailing list >> mpiwg-sessions(a)lists.mpi-forum.org >> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-sessions >> > >

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Re: [mpiwg-sessions] Slides posted to discuss next Monday
by Jim Dinan 08 Apr '16

08 Apr '16

Hi All, I was looking through past meeting materials today and came across a past init/finalize presentation that Jeff gave. I don't think there's a need to revisit this discussion, since we ultimately reached the conclusion that init/finalize are wedged at their current semantics, but it could be interesting background for anyone who is interested: http://meetings.mpi-forum.org/secretary/2013/09/slides/jsquyres-init-finali… ~Jim. On Mon, Apr 4, 2016 at 3:01 PM, Bland, Wesley <wesley.bland(a)intel.com> wrote: > Hi all, > > I’ve updated the wiki with notes from today’s sessions call. Thanks to all > who contributed. If I missed anything, feel free to correct it. > > The plan for next week will be to pick up where we left off which will be > slide 69, MPI_GET_WTIME_IS_GLOBAL. > > Thanks, > Wesley > > > On Mar 31, 2016, at 12:01 PM, Jeff Squyres (jsquyres) < > jsquyres(a)cisco.com> wrote: > > > > Sessions WG -- > > > > I have posted notes and slides to discuss for this upcoming Monday: > > > > - edits to old slides to clarify old questions > > - several new slides to propose/address answers to bigger questions > (e.g., COMM_SPAWN/COMM_PARENT, etc.) > > > > See: > https://github.com/mpiwg-sessions/sessions-issues/wiki/2016-04-04-webex > > > > Regrettably, I am unable to join the call on Monday. I'll go over the > proposed updates with Wesley before Monday; hopefully he'll be able to help > guide the conversation. > > > > Please take good notes / minutes. Wesley and I will sync up after the > meeting. > > > > -- > > Jeff Squyres > > jsquyres(a)cisco.com > > For corporate legal information go to: > http://www.cisco.com/web/about/doing_business/legal/cri/ > > > > _______________________________________________ > > mpiwg-sessions mailing list > > mpiwg-sessions(a)lists.mpi-forum.org > > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-sessions > > _______________________________________________ > mpiwg-sessions mailing list > mpiwg-sessions(a)lists.mpi-forum.org > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-sessions >

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Re: [mpiwg-sessions] Slides posted to discuss next Monday
by Bland, Wesley 04 Apr '16

04 Apr '16

Hi all, I’ve updated the wiki with notes from today’s sessions call. Thanks to all who contributed. If I missed anything, feel free to correct it. The plan for next week will be to pick up where we left off which will be slide 69, MPI_GET_WTIME_IS_GLOBAL. Thanks, Wesley > On Mar 31, 2016, at 12:01 PM, Jeff Squyres (jsquyres) <jsquyres(a)cisco.com> wrote: > > Sessions WG -- > > I have posted notes and slides to discuss for this upcoming Monday: > > - edits to old slides to clarify old questions > - several new slides to propose/address answers to bigger questions (e.g., COMM_SPAWN/COMM_PARENT, etc.) > > See: https://github.com/mpiwg-sessions/sessions-issues/wiki/2016-04-04-webex > > Regrettably, I am unable to join the call on Monday. I'll go over the proposed updates with Wesley before Monday; hopefully he'll be able to help guide the conversation. > > Please take good notes / minutes. Wesley and I will sync up after the meeting. > > -- > Jeff Squyres > jsquyres(a)cisco.com > For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/ > > _______________________________________________ > mpiwg-sessions mailing list > mpiwg-sessions(a)lists.mpi-forum.org > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-sessions

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Slides posted to discuss next Monday
by Jeff Squyres (jsquyres) 31 Mar '16

31 Mar '16

Sessions WG -- I have posted notes and slides to discuss for this upcoming Monday: - edits to old slides to clarify old questions - several new slides to propose/address answers to bigger questions (e.g., COMM_SPAWN/COMM_PARENT, etc.) See: https://github.com/mpiwg-sessions/sessions-issues/wiki/2016-04-04-webex Regrettably, I am unable to join the call on Monday. I'll go over the proposed updates with Wesley before Monday; hopefully he'll be able to help guide the conversation. Please take good notes / minutes. Wesley and I will sync up after the meeting. -- 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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Webex today
by Jeff Squyres (jsquyres) 21 Mar '16

21 Mar '16

Remember that the webex is today (in a little over 15 mins from now): https://github.com/mpiwg-sessions/sessions-issues/wiki 1. If people attend who weren't at the initial presentation, essentially give the presentation again (albeit in condensed form). --> If most/all attendees today were at the Chicago presentation, we can skip this step. 2. Start talking through the open issues. -- 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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Regular webex meeting time
by Jeff Squyres (jsquyres) 15 Mar '16

15 Mar '16

The Doodle hath spoken: - Starting Monday, March 21, 2016 - Meet every other week - 1-2pm US Eastern time (again, apologies to our non-US friends in dealing with crazy DST timing) - Webex: https://cisco.webex.com/ciscosales/j.php?MTID=me1a76ec7a48acaf4b0a9049af071… That being said, I will be able to attend the March 21 meeting, but then I have to miss the next two (Apr 4 and Apr 18) due to prior commitments. :-\ I'll coordinate with someone who attends these two meetings so that we can keep this regular schedule, and over time, all of us will be able to normalize our schedules to be able to make this time slot. The meeting time and webex link are posted on the wiki: https://github.com/mpiwg-sessions/sessions-issues/wiki -- 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: [mpiwg-sessions] Proposed meeting time
by Daniel Holmes 14 Mar '16

14 Mar '16

Hi Jeff, et al, That will be OK with me. It'll be 5pm-6pm on 21st March (GMT) and then 6pm-7pm for the rest of the Summer (BST). Cheers, Dan. On 14/03/2016 15:55, Jeff Squyres (jsquyres) wrote: > On Mar 14, 2016, at 11:50 AM, Bland, Wesley <wesley.bland(a)intel.com> wrote: >> I think you mean 10:00 AM US Pacific. ☺ > Err... right. :-) > >> Even so, a sample size of 6 isn’t enough. Hopefully more folks chime in here. Do you know how many people are subscribed to the list at this point? > 14. > > And several more just replied on the Doodle. :-) > > March 21 / 1pm US Eastern / 10am US Pacific still looks good. > >> -----Original Message----- >> From: mpiwg-sessions <mpiwg-sessions-bounces(a)lists.mpi-forum.org> on behalf of Jeff Squyres <jsquyres(a)cisco.com> >> Reply-To: MPI Sessions working group <mpiwg-sessions(a)lists.mpi-forum.org> >> Date: Monday, March 14, 2016 at 10:45 AM >> To: "mpiwg-sessions(a)lists.mpi-forum.org" <mpiwg-sessions(a)lists.mpi-forum.org> >> Subject: [mpiwg-sessions] Proposed meeting time >> >> Per the Doodle poll (http://doodle.com/poll/fim6ui235yibyzne) it looks like: >> >> - March 21, 1pm US Eastern / 4pm US Pacific >> - Meeting every 2 weeks >> >> Will work out. Apologies to our European friends with DST confusions. :-\ >> >> If you want to be part of the regular webexes, please go answer the Doodle ASAP. >> >> Thanks. >> >> -- >> Jeff Squyres >> jsquyres(a)cisco.com >> For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/ >> >> _______________________________________________ >> mpiwg-sessions mailing list >> mpiwg-sessions(a)lists.mpi-forum.org >> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-sessions >> >> >> _______________________________________________ >> mpiwg-sessions mailing list >> mpiwg-sessions(a)lists.mpi-forum.org >> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-sessions > -- Dan Holmes Applications Consultant in HPC Research EPCC, The University of Edinburgh James Clerk Maxwell Building The Kings Buildings Peter Guthrie Tait Road Edinburgh EH9 3FD T: +44(0)131 651 3465 E: dholmes(a)epcc.ed.ac.uk *Please consider the environment before printing this email.* The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.

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