April 2012 - mpiwg-rma - mailman3.cels.anl.gov

Re: [Mpi3-rma] Joint RMA/FT Teleconf
by Josh Hursey 26 Apr '12

26 Apr '12

Some responses inline below. On Wed, Apr 25, 2012 at 6:05 PM, Jim Dinan <dinan(a)mcs.anl.gov> wrote: > Hi FT Folks, > > I was reading on in the proposal and had a few questions/comments: > > Is MPI_Win_invalidate collective or local? ï¿½This isn't clear from the text. Win_invalidate is a local operation with remote implications. So only one process needs to call it. In the Comm_invalidate definition we say it is "not collective". We'll work on tidying up that language. I think Brian mentioned this yesterday as well. > > Is the chapter name "Process Fault Tolerance" an improvement over just > "Fault Tolerance." ï¿½The former seems unnecessarily limiting. The chapter is currently only concerned with process fault tolerance, so I think that is where the title change came from. However, I see your point about being restrictive if we decide to account for other types of faults in the future. FT group what do you think about this? > > p.545, Advice #1: Ignoring that an advice to users is non-normative, > does this users mean that we /have to/ propagate failure information in > synchronization operations that don't target failed processes? ï¿½If this > is not the case, how can I find out about failed processes? ï¿½Is there a > validate or agreement function that could be used to force an update? > If so, that would be better to mention here. > > I think I also would prefer to end this advice with "with communication > that targets a failed process." I believe the intention was to provide guidance to the implementor, and not a requirement though the wording does seem to express the requirement of failure propagation during synchronization. Additionally, I believe the intention was to keep the restriction that the synchronization operation is restricted to just those processes targeted, so your additional clarification seems appropriate. UTK folks do you want to comment on this? > > Thanks for the interesting discussion, > ï¿½~Jim. Thanks to everyone that participated in the discussion, it was quite helpful. The FT working group has a number of notes from the meeting, and will be working on some revised text to circulate in the next few weeks. After which we will likely want another teleconf to keep refining the RMA/FT ticket. -- Josh > > On 04/25/2012 07:48 AM, Josh Hursey wrote: >> Just a reminder that we have a teleconf this afternoon. >> >> -- Josh >> >> On Thu, Apr 19, 2012 at 4:15 PM, Josh Hursey <jjhursey(a)open-mpi.org> wrote: >>> It looks like April 25 from 3-4 pm Eastern works best for everyone >>> that responded. Below are the teleconf details: >>> ï¿½Date: April 25, 2012 >>> ï¿½Time: 3 pm Eastern/New York >>> ï¿½Dial-in information: 877-801-8130 >>> ï¿½Code: 1044056 >>> >>> -- Josh >>> >>> On Tue, Apr 17, 2012 at 10:45 AM, Josh Hursey <jjhursey(a)open-mpi.org> wrote: >>>> The FT working group would like to have a joint teleconf with the RMA >>>> working group to discuss the fault tolerance proposal. >>>> ï¿½- https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/323 >>>> ï¿½- https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/325 >>>> >>>> A Doodle Poll link is below to schedule: >>>> ï¿½- http://www.doodle.com/gv8k9y223abhabrz >>>> >>>> If you are interested in participating in this teleconf, fill out the >>>> poll by 2 pm Eastern on Thursday, April 19. >>>> >>>> Thanks, >>>> Josh >>>> >>>> >>>> -- >>>> Joshua Hursey >>>> Postdoctoral Research Associate >>>> Oak Ridge National Laboratory >>>> http://users.nccs.gov/~jjhursey >>> >>> >>> >>> -- >>> Joshua Hursey >>> Postdoctoral Research Associate >>> Oak Ridge National Laboratory >>> http://users.nccs.gov/~jjhursey >> >> >> > > _______________________________________________ > mpi3-rma mailing list > mpi3-rma(a)lists.mpi-forum.org > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi3-rma -- Joshua Hursey Postdoctoral Research Associate Oak Ridge National Laboratory http://users.nccs.gov/~jjhursey

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Re: [Mpi3-rma] Joint RMA/FT Teleconf
by Jim Dinan 25 Apr '12

25 Apr '12

Hi FT Folks, I was reading on in the proposal and had a few questions/comments: Is MPI_Win_invalidate collective or local? This isn't clear from the text. Is the chapter name "Process Fault Tolerance" an improvement over just "Fault Tolerance." The former seems unnecessarily limiting. p.545, Advice #1: Ignoring that an advice to users is non-normative, does this users mean that we /have to/ propagate failure information in synchronization operations that don't target failed processes? If this is not the case, how can I find out about failed processes? Is there a validate or agreement function that could be used to force an update? If so, that would be better to mention here. I think I also would prefer to end this advice with "with communication that targets a failed process." Thanks for the interesting discussion, ~Jim. On 04/25/2012 07:48 AM, Josh Hursey wrote: > Just a reminder that we have a teleconf this afternoon. > > -- Josh > > On Thu, Apr 19, 2012 at 4:15 PM, Josh Hursey <jjhursey(a)open-mpi.org> wrote: >> It looks like April 25 from 3-4 pm Eastern works best for everyone >> that responded. Below are the teleconf details: >> Date: April 25, 2012 >> Time: 3 pm Eastern/New York >> Dial-in information: 877-801-8130 >> Code: 1044056 >> >> -- Josh >> >> On Tue, Apr 17, 2012 at 10:45 AM, Josh Hursey <jjhursey(a)open-mpi.org> wrote: >>> The FT working group would like to have a joint teleconf with the RMA >>> working group to discuss the fault tolerance proposal. >>> - https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/323 >>> - https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/325 >>> >>> A Doodle Poll link is below to schedule: >>> - http://www.doodle.com/gv8k9y223abhabrz >>> >>> If you are interested in participating in this teleconf, fill out the >>> poll by 2 pm Eastern on Thursday, April 19. >>> >>> Thanks, >>> Josh >>> >>> >>> -- >>> Joshua Hursey >>> Postdoctoral Research Associate >>> Oak Ridge National Laboratory >>> http://users.nccs.gov/~jjhursey >> >> >> >> -- >> Joshua Hursey >> Postdoctoral Research Associate >> Oak Ridge National Laboratory >> http://users.nccs.gov/~jjhursey > > >

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Re: [Mpi3-rma] Joint RMA/FT Teleconf
by Josh Hursey 25 Apr '12

25 Apr '12

Just a reminder that we have a teleconf this afternoon. -- Josh On Thu, Apr 19, 2012 at 4:15 PM, Josh Hursey <jjhursey(a)open-mpi.org> wrote: > It looks like April 25 from 3-4 pm Eastern works best for everyone > that responded. Below are the teleconf details: > ï¿½Date: April 25, 2012 > ï¿½Time: 3 pm Eastern/New York > ï¿½Dial-in information: 877-801-8130 > ï¿½Code: 1044056 > > -- Josh > > On Tue, Apr 17, 2012 at 10:45 AM, Josh Hursey <jjhursey(a)open-mpi.org> wrote: >> The FT working group would like to have a joint teleconf with the RMA >> working group to discuss the fault tolerance proposal. >> ï¿½- https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/323 >> ï¿½- https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/325 >> >> A Doodle Poll link is below to schedule: >> ï¿½- http://www.doodle.com/gv8k9y223abhabrz >> >> If you are interested in participating in this teleconf, fill out the >> poll by 2 pm Eastern on Thursday, April 19. >> >> Thanks, >> Josh >> >> >> -- >> Joshua Hursey >> Postdoctoral Research Associate >> Oak Ridge National Laboratory >> http://users.nccs.gov/~jjhursey > > > > -- > Joshua Hursey > Postdoctoral Research Associate > Oak Ridge National Laboratory > http://users.nccs.gov/~jjhursey -- Joshua Hursey Postdoctoral Research Associate Oak Ridge National Laboratory http://users.nccs.gov/~jjhursey

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Re: [Mpi3-rma] Joint RMA/FT Teleconf
by Josh Hursey 19 Apr '12

19 Apr '12

It looks like April 25 from 3-4 pm Eastern works best for everyone that responded. Below are the teleconf details: Date: April 25, 2012 Time: 3 pm Eastern/New York Dial-in information: 877-801-8130 Code: 1044056 -- Josh On Tue, Apr 17, 2012 at 10:45 AM, Josh Hursey <jjhursey(a)open-mpi.org> wrote: > The FT working group would like to have a joint teleconf with the RMA > working group to discuss the fault tolerance proposal. > ï¿½- https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/323 > ï¿½- https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/325 > > A Doodle Poll link is below to schedule: > ï¿½- http://www.doodle.com/gv8k9y223abhabrz > > If you are interested in participating in this teleconf, fill out the > poll by 2 pm Eastern on Thursday, April 19. > > Thanks, > Josh > > > -- > Joshua Hursey > Postdoctoral Research Associate > Oak Ridge National Laboratory > http://users.nccs.gov/~jjhursey -- Joshua Hursey Postdoctoral Research Associate Oak Ridge National Laboratory http://users.nccs.gov/~jjhursey

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[Mpi3-rma] Joint RMA/FT Teleconf
by Josh Hursey 17 Apr '12

17 Apr '12

The FT working group would like to have a joint teleconf with the RMA working group to discuss the fault tolerance proposal. - https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/323 - https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/325 A Doodle Poll link is below to schedule: - http://www.doodle.com/gv8k9y223abhabrz If you are interested in participating in this teleconf, fill out the poll by 2 pm Eastern on Thursday, April 19. Thanks, Josh -- Joshua Hursey Postdoctoral Research Associate Oak Ridge National Laboratory http://users.nccs.gov/~jjhursey

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