February 2018 - mpiwg-ft - mailman3.cels.anl.gov

FTWG Notes from F2F WG Session
by Bland, Wesley 28 Feb '18

28 Feb '18

The notes from yesterday's WG session are now posted on the wiki: https://github.com/mpiwg-ft/ft-issues/wiki/2018-02-27

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Aborting When Error Handlers are Non-Uniform
by Bland, Wesley 22 Feb '18

22 Feb '18

Hi FTWG, Jim Dinan pointed out an important use case for error handlers that we're not solving in our current proposals (#1 & #3) that we might want to consider: Because error handlers are not uniformly set on all processes in a communicator, it's possible that some processes might set MPI_ERRORS_ARE_FATAL and others would set MPI_ERRORS_RETURN. This would allow a process that has set FATAL to kill a process that has set RETURN. The place where this might particularly bad is in a connect/accept app where the client has the default ABORT and the server has set RETURN. A bad client can kill a good server. A solution to this would be to say that the error handlers signal to all connected processes (or processes in the communicator in the case of MPI_ERRORS_ABORT) that they want to abort, but each MPI process should consult its own error handler before actually deciding whether or not to abort itself. The current spec seems a bit fuzzy on this, but I believe our proposal actively prevents this by couching the definition of these error handlers in the definition of MPI_ABORT. We could solve this by changing the specification of these error handlers to be something more like what I have above. This, of course, would mean that we'd withdraw the proposal from a vote next week if we wanted to go that route. Thanks, Wesley

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Canceled: Fault Tolerance Working Group Con Call
by Bland, Wesley 22 Feb '18

22 Feb '18

When: Wednesday, February 28, 2018 5:00 PM-6:00 PM. UTC Where: Zoom *~*~*~*~*~*~*~*~*~* Weekly con call to discuss Fault Tolerance Topics as they relate to the MPI Standard. I’ll try to update the agenda before the call weekly (as opposed to the old way of sending a reminder email). === Join from PC, Mac, Linux, iOS or Android: https://tennessee.zoom.us/j/632356722?pwd=lI4%2F169CGcewIumekTziMw%3D%3D Password: mpiforum Or iPhone one-tap (US Toll): +14086380968,632356722# or +16465588656,632356722# Or Telephone: Dial: +1 408 638 0968 (US Toll) or +1 646 558 8656 (US Toll) Meeting ID: 632 356 722 International numbers available: https://tennessee.zoom.us/zoomconference?m=GscM59o_Qoig8v4aJl1OrsnXL-7Blrke Or an H.323/SIP room system: H.323: 162.255.37.11 (US West) or 162.255.36.11 (US East) Meeting ID: 632 356 722 Password: 366244 SIP: 632356722(a)zoomcrc.com Password: 366244

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FTWG Con Call - 2018-02-21
by Bland, Wesley 21 Feb '18

21 Feb '18

The Fault Tolerance Working Group’s weekly con call is today at 12:00 PM Eastern. Today's agenda: * Go over plans and slides for the upcoming F2F meeting's plenaries, readings, and WG time If there's something else that people would like to discuss, please just send an email to the WG so we can get it on the agenda. Thanks, Wesley ......................................................................................................................................... Join from PC, Mac, Linux, iOS or Android: https://tennessee.zoom.us/j/632356722?pwd=lI4%2F169CGcewIumekTziMw%3D%3D Password: mpiforum Or iPhone one-tap (US Toll): +14086380968,632356722# or +16465588656,632356722# Or Telephone: Dial: +1 408 638 0968 (US Toll) or +1 646 558 8656 (US Toll) Meeting ID: 632 356 722 International numbers available: https://tennessee.zoom.us/zoomconference?m=GscM59o_Qoig8v4aJl1OrsnXL-7Blrke Or an H.323/SIP room system: H.323: 162.255.37.11 (US West) or 162.255.36.11 (US East) Meeting ID: 632 356 722 Password: 366244 SIP: 632356722(a)zoomcrc.com Password: 366244 .........................................................................................................................................

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Canceled: Fault Tolerance Working Group Con Call
by Bland, Wesley 12 Feb '18

12 Feb '18

When: Wednesday, February 14, 2018 5:00 PM-6:00 PM. UTC Where: Zoom *~*~*~*~*~*~*~*~*~* Weekly con call to discuss Fault Tolerance Topics as they relate to the MPI Standard. I’ll try to update the agenda before the call weekly (as opposed to the old way of sending a reminder email). === Join from PC, Mac, Linux, iOS or Android: https://tennessee.zoom.us/j/632356722?pwd=lI4%2F169CGcewIumekTziMw%3D%3D Password: mpiforum Or iPhone one-tap (US Toll): +14086380968,632356722# or +16465588656,632356722# Or Telephone: Dial: +1 408 638 0968 (US Toll) or +1 646 558 8656 (US Toll) Meeting ID: 632 356 722 International numbers available: https://tennessee.zoom.us/zoomconference?m=GscM59o_Qoig8v4aJl1OrsnXL-7Blrke Or an H.323/SIP room system: H.323: 162.255.37.11 (US West) or 162.255.36.11 (US East) Meeting ID: 632 356 722 Password: 366244 SIP: 632356722(a)zoomcrc.com Password: 366244

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Cancel This Week's Meeting
by Bland, Wesley 12 Feb '18

12 Feb '18

Hi folks, I've had something else come up and I won't be able to attend this week's con call on Wednesday. I propose we cancel and plan to go over slides and anything else we need to plan for the upcoming F2F next week. Thanks, Wesley

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FTWG Readings - Feb 2018 Edition
by Bland, Wesley 12 Feb '18

12 Feb '18

Hi all, Here's the official activity to expect from the Fault Tolerance Working Group at the meeting in two weeks: Votes: * #1<https://github.com/mpi-forum/mpi-issues/issues/1>: Clarify MPI_ERRORS_ARE_FATAL scope of abort * #3<https://github.com/mpi-forum/mpi-issues/issues/3>: Define new MPI Error handler for subcommunicator abort Readings: * (Issue) <https://github.com/mpi-forum/mpi-issues/issues/28> #2<https://github.com/mpi-forum/mpi-issues/issues/20>8 / (Pull Request) #9<https://github.com/mpi-forum/mpi-standard/pull/9>: Catastrophic Errors * (Issue) #20<https://github.com/mpi-forum/mpi-issues/issues/20> / (Pull Request) #13<https://github.com/mpi-forum/mpi-standard/pull/13>: ULFM Thanks, Wesley

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Canceled: Fault Tolerance Working Group Con Call
by Bland, Wesley 07 Feb '18

07 Feb '18

Weekly con call to discuss Fault Tolerance Topics as they relate to the MPI Standard. I’ll try to update the agenda before the call weekly (as opposed to the old way of sending a reminder email). === Join from PC, Mac, Linux, iOS or Android: https://tennessee.zoom.us/j/632356722?pwd=lI4%2F169CGcewIumekTziMw%3D%3D Password: mpiforum Or iPhone one-tap (US Toll): +14086380968,632356722# or +16465588656,632356722# Or Telephone: Dial: +1 408 638 0968 (US Toll) or +1 646 558 8656 (US Toll) Meeting ID: 632 356 722 International numbers available: https://tennessee.zoom.us/zoomconference?m=GscM59o_Qoig8v4aJl1OrsnXL-7Blrke Or an H.323/SIP room system: H.323: 162.255.37.11 (US West) or 162.255.36.11 (US East) Meeting ID: 632 356 722 Password: 366244 SIP: 632356722(a)zoomcrc.com Password: 366244

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Re: [mpiwg-ft] [EXTERNAL] Cancel FTWG Call Today?
by Bland, Wesley 07 Feb '18

07 Feb '18

Ok. Then we'll cancel this week. We'll see if there's any progress on these issues before next week or if we just wait for the F2F at the end of the month. > On Feb 7, 2018, at 9:54 AM, Teranishi, Keita <knteran(a)sandia.gov> wrote: > > I am at the ECP meeting. Is it possible to postpone the meeting (cancel)? > > On 2/7/18, 7:34 AM, "mpiwg-ft on behalf of Bland, Wesley" <mpiwg-ft-bounces(a)lists.mpi-forum.org on behalf of wesley.bland(a)intel.com> wrote: > > Hi folks, > > Looking over the results of the discussion from last week, I'm wondering if it makes sense to have a call today. I think most of the topics are either ready for a plenary (catastrophic errors) or need a few more weeks for people to work on them (collective ops related to ULFM, FT interop with intercommunicators, reinit). > > Is there something that someone is ready to discuss on the call today or should we cancel this week? > > Thanks, > Wesley > _______________________________________________ > mpiwg-ft mailing list > mpiwg-ft(a)lists.mpi-forum.org > https://lists.mpi-forum.org/mailman/listinfo/mpiwg-ft > > > _______________________________________________ > mpiwg-ft mailing list > mpiwg-ft(a)lists.mpi-forum.org > https://lists.mpi-forum.org/mailman/listinfo/mpiwg-ft

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Re: [mpiwg-ft] [EXTERNAL] Cancel FTWG Call Today?
by Teranishi, Keita 07 Feb '18

07 Feb '18

I am at the ECP meeting. Is it possible to postpone the meeting (cancel)? On 2/7/18, 7:34 AM, "mpiwg-ft on behalf of Bland, Wesley" <mpiwg-ft-bounces(a)lists.mpi-forum.org on behalf of wesley.bland(a)intel.com> wrote: Hi folks, Looking over the results of the discussion from last week, I'm wondering if it makes sense to have a call today. I think most of the topics are either ready for a plenary (catastrophic errors) or need a few more weeks for people to work on them (collective ops related to ULFM, FT interop with intercommunicators, reinit). Is there something that someone is ready to discuss on the call today or should we cancel this week? Thanks, Wesley _______________________________________________ mpiwg-ft mailing list mpiwg-ft(a)lists.mpi-forum.org https://lists.mpi-forum.org/mailman/listinfo/mpiwg-ft

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