- mpiwg-tools - mailman3.cels.anl.gov

Re: [Mpi3-tools] Meeting Minutes / Hot Button Issues / Next Meeting
by Jeff Squyres 11 Aug '09

11 Aug '09

On Aug 10, 2009, at 7:49 PM, Martin Schulz wrote: > - Which language bindings do we want? (C for sure, Fortran?) > My $0.20 is C only. :-) > - Are there existing schemes (from CORBA/DCOM or debuggers in > general) on > how to represent names for types and enum members? > It strikes me that TVT/Allinea might have experience in this area (general name/type/value registration). -- Jeff Squyres jsquyres(a)cisco.com

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[Mpi3-tools] Meeting Minutes / Hot Button Issues / Next Meeting
by Martin Schulz 10 Aug '09

10 Aug '09

Hi all, The minutes from today's meeting are on the Wiki at the usual place. During the meeting we came across several issues that we need feedback for from a larger group. Please comment on them, either via the mail list or at the next meeting: - How can we handle pre-MPI_Init calls to PIMPI? - Impact on type system, which may not be initialized? - Can we require types to be equivalent with MPI types? - Which language bindings do we want? (C for sure, Fortran?) - How are variables handled in the various MPIs and how can they best be represented as handles? Is it normal to have handles anyway or would handles for everything be too resources consuming? - Are there existing schemes (from CORBA/DCOM or debuggers in general) on how to represent names for types and enum members? For the next meeting we plan on continuing the PIMPI API discussion starting with the counter state variables starting on slide 11 (and hopefully finish it) - after that the plan is to transition to the MPIR successor. The next meeting is on 8/24 at the usual time at 8am PDT. We'll again be using Webex - the link for the meeting is on the Wiki. Martin _______________________________________________________________________ Martin Schulz, schulzm(a)llnl.gov, http://people.llnl.gov/schulzm CASC @ Lawrence Livermore National Laboratory, Livermore, USA

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Re: [Mpi3-tools] Next Meeting: Monday 8/10 8am PDT (using Webex!)
by Ashley Pittman 10 Aug '09

10 Aug '09

On Sat, 2009-08-08 at 21:42 -0700, Martin Schulz wrote: > Hi all, > > > Our next MPI3 tools WG meeting will be on Monday 8/10 at 8am PDT. Apologies as I won't be a able to make the call this week due to other commitments. > So far the only agenda point that I have Jeff and I spoke over my collectives proposal discussed before, the general consensus at the time was that I should work with Jeff to integrate this into being a part of his general handles debug interface. Having discussed this we now realise that's a sensible or realistic approach. As such my proposal stands as it originally did, I'd like to propose a small collective extension built on the existing message queue interface. To some extent this is therefore blocked on that work being written up and adopted before I can proceed. I'm easy on the specifics of the function parameters but the basics are the library maintains a pair of counters for each possible collective (Bcast/Barrier...) for each communicator. An extra callback function is added which returns this information for the "currently active communicator" in much the same way as message queue information is returned. The query operation is entirely local and is only aggregated into something more useful inside the tool which has access to the results from all processes. The two counters are initiated at zero and incremented when A) A call to the collective is made and B) that call returns. The interface returns both the first counter and either the second counter or potentially a single bit of information specifying whether the counters are equal or not (i.e. if the collective is "active" on that rank). As before the proposal is on-line at http://padb.pittman.org.uk/extensions/ > To help this discussion, Jeff has offered to host this meeting via > Webex. ... that this will make it free even for non US callers :). That's appreciated from this end. Ashley Pittman. -- Ashley Pittman, Bath, UK. Padb - A parallel job inspection tool for cluster computing http://padb.pittman.org.uk

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Re: [Mpi3-tools] Next Meeting: Monday 8/10 8am PDT (using Webex!)
by Marc-Andre Hermanns 10 Aug '09

10 Aug '09

Hi Martin, I will join a little late today, as I am hosting a larger workshop today, which ends at 8am PDT. I will need some time to close the session and get to my office. Best regards, Marc-Andre Martin Schulz wrote: > Hi all, > > Our next MPI3 tools WG meeting will be on Monday 8/10 at 8am PDT. So far the only > agenda point that I have is to continue going through the API proposal for the > performance information interface. The slides for this discussion (with the notes > from last time) are at: > > https://svn.mpi-forum.org/trac/mpi-forum-web/wiki/MPI3Tools/slides-07-28 > > To help this discussion, Jeff has offered to host this meeting via Webex. To join this > meeting, follow the instructions below. The plan is to use the web functionality to > share and update the slides online and then to use Webex's phone features (you > can enter a phone number under which Webex will call you back) for the > discussions. Hence we will NOT be using the old dial-in number. The good news > is, though, that this will make it free even for non US callers :). > > If you have questions about this, please let Jeff and me know. > > Talk to you Monday, > > Martin > > > From: Jeff Squyres <messenger(a)webex.com<mailto:[email protected]>> > Date: August 3, 2009 11:15:31 AM EDT > To: jsquyres(a)cisco.com<mailto:[email protected]> > Subject: (Forward to attendees) Meeting invitation: MPI-3 tools WG meeting > Reply-To: jsquyres(a)cisco.com<mailto:[email protected]> > > **** You can forward this email invitation to attendees **** > > Hello , > > Jeff Squyres invites you to attend this online meeting. > > Topic: MPI-3 tools WG meeting > Date: Every 2 weeks on Monday, from Monday, August 10, 2009 to Monday, August 24, 2009 > Time: 11:00 am, Eastern Daylight Time (New York, GMT-04:00) > Meeting Number: 201 260 438 > Meeting Password: tools > > Please click the link below to see more information, or to join the meeting. > > ---------------------------------------------------------------- > ALERT:Toll-Free Dial Restrictions for (408) and (919) Area Codes > ---------------------------------------------------------------- > > As of April 9th, 2009, you can no longer dial toll free in the 408 or 919 area codes in the United States. The affected toll free numbers are: (866) 432-9903 for the San Jose/Milpitas area and (866) 349-3520 for the RTP area. > > Please dial the local access number for your area from the list below: > - San Jose/Milpitas (408) area: 525-6800 > - RTP (919) area: 392-3330 > > ------------------------------------------------------- > To join the online meeting > ------------------------------------------------------- > 1. Go to https://cisco.webex.com/ciscosales/j.php?ED=123289567&UID=0&PW=NZWFmMDRiZmE…<https://*cisco.webex.com/ciscosales/j.php?ED=123289567&UID=0&PW=NZWFmMDRiZmE3&RT=MiMxMQ%3D%3D> > 2. Enter your name and email address. > 3. Enter the meeting password: tools > 4. Click "Join Now". > > ------------------------------------------------------- > To join the teleconference only > ------------------------------------------------------- > 1. Dial into Cisco WebEx (view all Global Access Numbers at > http://cisco.com/en/US/about/doing_business/conferencing/index.html<http://*cisco.com/en/US/about/doing_business/conferencing/index.html> > 2. Press 3 to attend the meeting. > 3. Follow the prompts to enter the Meeting Number (listed above) or Access Code followed by the # sign. > > San Jose, CA: +1.408.525.6800 RTP: +1.919.392.3330 > > US/Canada: +1.866.432.9903 United Kingdom: +44.20.8824.0117 > > India: +91.80.4350.1111 Germany: +49.619.6773.9002 > > Japan: +81.3.5763.9394 China: +86.10.8515.5666 > > > ------------------------------------------------------- > To join the meeting on iPhone > ------------------------------------------------------- > Go to wbx://cisco.webex.com/ciscosales?MK=201260438&MPW=f9d35d43770d39092a663e665… > > Don't have the iPhone WebEx application yet? > Go to http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=298844386<http://*itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=298844386> > > > ------------------------------------------------------- > For assistance > ------------------------------------------------------- > 1. Go to https://*cisco.webex.com/ciscosales/mc > 2. On the left navigation bar, click "Support". > > You can contact me at: > jsquyres(a)cisco.com<mailto:[email protected]> > 1-408-525 0971 > > To add this meeting to your calendar program (for example Microsoft Outlook), click this link: > https://cisco.webex.com/ciscosales/j.php?ED=123289567&UID=0&ICS=MI&LD=1&RD=…<https://*cisco.webex.com/ciscosales/j.php?ED=123289567&UID=0&ICS=MI&LD=1&RD=2&ST=1&SHA2=u9bB4DcKVpbjp3xLwq9VkPTtJn7MhFEoLacViJdj8IM=&RT=MiMxMQ%3D%3D> > > The playback of UCF (Universal Communications Format) rich media files requires appropriate players. To view this type of rich media files in the meeting, please check whether you have the players installed on your computer by going to https://cisco.webex.com/ciscosales/systemdiagnosis.php<https://*cisco.webex.com/ciscosales/systemdiagnosis.php> > > Sign up for a free trial of WebEx > http://www.webex.com/go/mcemfreetrial<http://*www.*webex.com/go/mcemfreetrial> > > http://www.webex.com<http://*www.*webex.com> > > IMPORTANT NOTICE: This WebEx service includes a feature that allows audio and any documents and other materials exchanged or viewed during the session to be recorded. By joining this session, you automatically consent to such recordings. If you do not consent to the recording, do not join the session. > > > > > _______________________________________________________________________ > Martin Schulz, schulzm(a)llnl.gov, http://people.llnl.gov/schulzm > CASC @ Lawrence Livermore National Laboratory, Livermore, USA > > > > > > > > > -- Marc-Andre Hermanns Juelich Supercomputing Centre Institute for Advanced Simulation Forschungszentrum Juelich GmbH D-52425 Juelich Germany Phone : +49-2461-61-2054 Fax : +49-2461-61-6656 eMail : m.a.hermanns(a)fz-juelich.de WWW : http://www.fz-juelich.de/jsc/ JSC is the coordinator of the John von Neumann Institute for Computing and member of the Gauss Centre for Supercomputing Sitz der Gesellschaft: Juelich Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498 Vorsitzende des Aufsichtsrats: MinDir'in Baerbel Brumme-Bothe Geschaeftsfuehrung: Prof. Dr. Achim Bachem (Vorsitzender), Dr. Ulrich Krafft (stellv. Vorsitzender), Prof. Dr. Harald Bolt, Prof. Dr. Sebastian M. Schmidt

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Re: [Mpi3-tools] Next Meeting: Monday 8/10 8am PDT (using Webex!)
by Bronis R. de Supinski 09 Aug '09

09 Aug '09

Martin: We should start brainstorming the design goals. Bronis On Sat, 8 Aug 2009, Martin Schulz wrote: > Hi all, > > Our next MPI3 tools WG meeting will be on Monday 8/10 at 8am PDT. So > far the only > agenda point that I have is to continue going through the API proposal > for the > performance information interface. The slides for this discussion > (with the notes > from last time) are at: > > https://*svn.mpi-forum.org/trac/mpi-forum-web/wiki/MPI3Tools/slides-07-28 > > To help this discussion, Jeff has offered to host this meeting via > Webex. To join this > meeting, follow the instructions below. The plan is to use the web > functionality to > share and update the slides online and then to use Webex's phone > features (you > can enter a phone number under which Webex will call you back) for the > discussions. Hence we will NOT be using the old dial-in number. The > good news > is, though, that this will make it free even for non US callers :). > > If you have questions about this, please let Jeff and me know. > > Talk to you Monday, > > Martin > > > > From: Jeff Squyres <messenger(a)webex.com> > > Date: August 3, 2009 11:15:31 AM EDT > > To: jsquyres(a)cisco.com > > Subject: (Forward to attendees) Meeting invitation: MPI-3 tools WG > > meeting > > Reply-To: jsquyres(a)cisco.com > > > > **** You can forward this email invitation to attendees **** > > > > Hello , > > > > Jeff Squyres invites you to attend this online meeting. > > > > Topic: MPI-3 tools WG meeting > > Date: Every 2 weeks on Monday, from Monday, August 10, 2009 to > > Monday, August 24, 2009 > > Time: 11:00 am, Eastern Daylight Time (New York, GMT-04:00) > > Meeting Number: 201 260 438 > > Meeting Password: tools > > > > Please click the link below to see more information, or to join the > > meeting. > > > > ---------------------------------------------------------------- > > ALERT:Toll-Free Dial Restrictions for (408) and (919) Area Codes > > ---------------------------------------------------------------- > > > > As of April 9th, 2009, you can no longer dial toll free in the 408 > > or 919 area codes in the United States. The affected toll free > > numbers are: (866) 432-9903 for the San Jose/Milpitas area and (866) > > 349-3520 for the RTP area. > > > > Please dial the local access number for your area from the list below: > > - San Jose/Milpitas (408) area: 525-6800 > > - RTP (919) area: 392-3330 > > > > ------------------------------------------------------- > > To join the online meeting > > ------------------------------------------------------- > > 1. Go to https://*cisco.webex.com/ciscosales/j.php?ED=123289567&UID=0&PW=NZWFmMDRiZmE3&RT=MiMxMQ%3D%3D > > 2. Enter your name and email address. > > 3. Enter the meeting password: tools > > 4. Click "Join Now". > > > > ------------------------------------------------------- > > To join the teleconference only > > ------------------------------------------------------- > > 1. Dial into Cisco WebEx (view all Global Access Numbers at > > http://*cisco.com/en/US/about/doing_business/conferencing/index.html > > 2. Press 3 to attend the meeting. > > 3. Follow the prompts to enter the Meeting Number (listed above) or > > Access Code followed by the # sign. > > > > San Jose, CA: +1.408.525.6800 RTP: +1.919.392.3330 > > > > US/Canada: +1.866.432.9903 United Kingdom: +44.20.8824.0117 > > > > India: +91.80.4350.1111 Germany: +49.619.6773.9002 > > > > Japan: +81.3.5763.9394 China: +86.10.8515.5666 > > > > > > ------------------------------------------------------- > > To join the meeting on iPhone > > ------------------------------------------------------- > > Go to wbx://cisco.webex.com/ciscosales? > > MK > > = > > 201260438 > > &MPW=f9d35d43770d39092a663e665e82ae1d84a9e0da3d0d10c407acada6a40cd281 > > > > Don't have the iPhone WebEx application yet? > > Go to http://*itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=298844386 > > > > > > ------------------------------------------------------- > > For assistance > > ------------------------------------------------------- > > 1. Go to https://**cisco.webex.com/ciscosales/mc > > 2. On the left navigation bar, click "Support". > > > > You can contact me at: > > jsquyres(a)cisco.com > > 1-408-525 0971 > > > > To add this meeting to your calendar program (for example Microsoft > > Outlook), click this link: > > https://*cisco.webex.com/ciscosales/j.php?ED=123289567&UID=0&ICS=MI&LD=1&RD=2&ST=1&SHA2=u9bB4DcKVpbjp3xLwq9VkPTtJn7MhFEoLacViJdj8IM=&RT=MiMxMQ%3D%3D > > > > The playback of UCF (Universal Communications Format) rich media > > files requires appropriate players. To view this type of rich media > > files in the meeting, please check whether you have the players > > installed on your computer by going to https://*cisco.webex.com/ciscosales/systemdiagnosis.php > > > > Sign up for a free trial of WebEx > > http://*www.*webex.com/go/mcemfreetrial > > > > http://*www.*webex.com > > > > IMPORTANT NOTICE: This WebEx service includes a feature that allows > > audio and any documents and other materials exchanged or viewed > > during the session to be recorded. By joining this session, you > > automatically consent to such recordings. If you do not consent to > > the recording, do not join the session. > > > > > _______________________________________________________________________ > Martin Schulz, schulzm(a)llnl.gov, http://*people.llnl.gov/schulzm > CASC @ Lawrence Livermore National Laboratory, Livermore, USA > > > > > > > >

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[Mpi3-tools] Next Meeting: Monday 8/10 8am PDT (using Webex!)
by Martin Schulz 08 Aug '09

08 Aug '09

Hi all, Our next MPI3 tools WG meeting will be on Monday 8/10 at 8am PDT. So far the only agenda point that I have is to continue going through the API proposal for the performance information interface. The slides for this discussion (with the notes from last time) are at: https://svn.mpi-forum.org/trac/mpi-forum-web/wiki/MPI3Tools/slides-07-28 To help this discussion, Jeff has offered to host this meeting via Webex. To join this meeting, follow the instructions below. The plan is to use the web functionality to share and update the slides online and then to use Webex's phone features (you can enter a phone number under which Webex will call you back) for the discussions. Hence we will NOT be using the old dial-in number. The good news is, though, that this will make it free even for non US callers :). If you have questions about this, please let Jeff and me know. Talk to you Monday, Martin > From: Jeff Squyres <messenger(a)webex.com> > Date: August 3, 2009 11:15:31 AM EDT > To: jsquyres(a)cisco.com > Subject: (Forward to attendees) Meeting invitation: MPI-3 tools WG > meeting > Reply-To: jsquyres(a)cisco.com > > **** You can forward this email invitation to attendees **** > > Hello , > > Jeff Squyres invites you to attend this online meeting. > > Topic: MPI-3 tools WG meeting > Date: Every 2 weeks on Monday, from Monday, August 10, 2009 to > Monday, August 24, 2009 > Time: 11:00 am, Eastern Daylight Time (New York, GMT-04:00) > Meeting Number: 201 260 438 > Meeting Password: tools > > Please click the link below to see more information, or to join the > meeting. > > ---------------------------------------------------------------- > ALERT:Toll-Free Dial Restrictions for (408) and (919) Area Codes > ---------------------------------------------------------------- > > As of April 9th, 2009, you can no longer dial toll free in the 408 > or 919 area codes in the United States. The affected toll free > numbers are: (866) 432-9903 for the San Jose/Milpitas area and (866) > 349-3520 for the RTP area. > > Please dial the local access number for your area from the list below: > - San Jose/Milpitas (408) area: 525-6800 > - RTP (919) area: 392-3330 > > ------------------------------------------------------- > To join the online meeting > ------------------------------------------------------- > 1. Go to https://cisco.webex.com/ciscosales/j.php?ED=123289567&UID=0&PW=NZWFmMDRiZmE… > 2. Enter your name and email address. > 3. Enter the meeting password: tools > 4. Click "Join Now". > > ------------------------------------------------------- > To join the teleconference only > ------------------------------------------------------- > 1. Dial into Cisco WebEx (view all Global Access Numbers at > http://cisco.com/en/US/about/doing_business/conferencing/index.html > 2. Press 3 to attend the meeting. > 3. Follow the prompts to enter the Meeting Number (listed above) or > Access Code followed by the # sign. > > San Jose, CA: +1.408.525.6800 RTP: +1.919.392.3330 > > US/Canada: +1.866.432.9903 United Kingdom: +44.20.8824.0117 > > India: +91.80.4350.1111 Germany: +49.619.6773.9002 > > Japan: +81.3.5763.9394 China: +86.10.8515.5666 > > > ------------------------------------------------------- > To join the meeting on iPhone > ------------------------------------------------------- > Go to wbx://cisco.webex.com/ciscosales? > MK > = > 201260438 > &MPW=f9d35d43770d39092a663e665e82ae1d84a9e0da3d0d10c407acada6a40cd281 > > Don't have the iPhone WebEx application yet? > Go to http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=298844386 > > > ------------------------------------------------------- > For assistance > ------------------------------------------------------- > 1. Go to https://*cisco.webex.com/ciscosales/mc > 2. On the left navigation bar, click "Support". > > You can contact me at: > jsquyres(a)cisco.com > 1-408-525 0971 > > To add this meeting to your calendar program (for example Microsoft > Outlook), click this link: > https://cisco.webex.com/ciscosales/j.php?ED=123289567&UID=0&ICS=MI&LD=1&RD=… > > The playback of UCF (Universal Communications Format) rich media > files requires appropriate players. To view this type of rich media > files in the meeting, please check whether you have the players > installed on your computer by going to https://cisco.webex.com/ciscosales/systemdiagnosis.php > > Sign up for a free trial of WebEx > http://www.webex.com/go/mcemfreetrial > > http://www.webex.com > > IMPORTANT NOTICE: This WebEx service includes a feature that allows > audio and any documents and other materials exchanged or viewed > during the session to be recorded. By joining this session, you > automatically consent to such recordings. If you do not consent to > the recording, do not join the session. _______________________________________________________________________ Martin Schulz, schulzm(a)llnl.gov, http://people.llnl.gov/schulzm CASC @ Lawrence Livermore National Laboratory, Livermore, USA

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[Mpi3-tools] Reminder: Meeting 7/28, 7am PDT, 10am EDT
by Martin Schulz 28 Jul '09

28 Jul '09

Hi all, Just as a reminder - we will have a face-to-face meeting for the MPI tools WG on Tuesday 7/28 during the MPI forum meeting at 9am CDT (7am PDT, one hour earlier than usual). The time slot for this meeting is for 1h 45min. We will also have a conference line for people who would like dial in. The number is as usual: * Toll Free Dial In Number for Offsite Participants: 866-914-3976 * International Access/Caller Paid Dial In Number: 925-424-8105 * Dial In Number for LLNL Onsite Participants: 4-8105 * Access Security Code: 860609 # As usual during the face-to-face meetings, we might need a little time to set up at the beginning and hence might be delayed for a few minutes. So far, the agenda has two main points (please let me know if someone would like to add a topic): - Report on the progress of the debug APIs (Jeff) - Discussion on a possible API for the performance interface (Martin) Slides for the latter are on the tools WG Wiki at: https://svn.mpi-forum.org/trac/mpi-forum-web/attachment/wiki/MPI3Tools/slid… Martin _______________________________________________________________________ Martin Schulz, schulzm(a)llnl.gov, http://people.llnl.gov/schulzm CASC @ Lawrence Livermore National Laboratory, Livermore, USA

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Re: [Mpi3-tools] Notes online & Next TelCon 7/13
by Martin Schulz 13 Jul '09

13 Jul '09

HI Marty, On Jul 13, 2009, at 7:39 AM, Marty Itzkowitz wrote: > Is the concall on for this morning? What phone number? Yes, at the usual number: > Toll Free Dial In Number for Offsite Participants: 866-914-3976 > International Access/Caller Paid Dial In Number: 925-424-8105 > Dial In Number for LLNL Onsite Participants: 4-8105 > > Access Security Code: 860609 # Martin > > Thanks, > Marty > > On 7/6/09 3:12 PM, Martin Schulz wrote: >> Hi all, >> >> The notes from the PIMPI discussion last week are now online (sorry >> for the delay). The >> next MPI3 tools WG TelCon is scheduled for next week on 7/13 at 8am >> PDT as usual. >> The main agenda item so far is to continue the discussion of the >> PIMPI proposal. If >> you have anything that you would like to bring up, please let me >> know (Jeff, any >> updates on the debug APIs you want to talk about?). >> >> On 7/27 we will skip the TelCon due to the MPI Forum meeting that >> week. At the forum >> we will have a face-to-face tools WG meeting, which is scheduled >> for Tuesday 7/28 at >> 9am CDT, which one hour earlier than usual. We will setup a TelCon >> for this meeting >> using the usual number. >> >> Martin >> >> >> _______________________________________________________________________ >> Martin Schulz, schulzm(a)llnl.gov, http://* people.llnl.gov/schulz6 >> CASC @ Lawrence Livermore National Laboratory, Livermore, USA >> >> >> >> >> >> _______________________________________________ >> Mpi3-tools mailing list >> Mpi3-tools(a)lists.mpi-forum.org >> http://*lists.mpi-forum.org/mailman/listinfo.cgi/mpi3-tools > _______________________________________________ > Mpi3-tools mailing list > Mpi3-tools(a)lists.mpi-forum.org > http://*lists.mpi-forum.org/mailman/listinfo.cgi/mpi3-tools > _______________________________________________________________________ Martin Schulz, schulzm(a)llnl.gov, http:// people.llnl.gov/schulz6 CASC @ Lawrence Livermore National Laboratory, Livermore, USA

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Re: [Mpi3-tools] Notes online & Next TelCon 7/13
by Marty Itzkowitz 13 Jul '09

13 Jul '09

Is the concall on for this morning? What phone number? Thanks, Marty On 7/6/09 3:12 PM, Martin Schulz wrote: > Hi all, > > The notes from the PIMPI discussion last week are now online (sorry > for the delay). The > next MPI3 tools WG TelCon is scheduled for next week on 7/13 at 8am > PDT as usual. > The main agenda item so far is to continue the discussion of the PIMPI > proposal. If > you have anything that you would like to bring up, please let me know > (Jeff, any > updates on the debug APIs you want to talk about?). > > On 7/27 we will skip the TelCon due to the MPI Forum meeting that > week. At the forum > we will have a face-to-face tools WG meeting, which is scheduled for > Tuesday 7/28 at > 9am CDT, which one hour earlier than usual. We will setup a TelCon for > this meeting > using the usual number. > > Martin > > > _______________________________________________________________________ > Martin Schulz, schulzm(a)llnl.gov, http:// people.llnl.gov/schulz6 > CASC @ Lawrence Livermore National Laboratory, Livermore, USA > > > > > > _______________________________________________ > Mpi3-tools mailing list > Mpi3-tools(a)lists.mpi-forum.org > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi3-tools

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Re: [Mpi3-tools] lightweight event log
by Marc-Andre Hermanns 08 Jul '09

08 Jul '09

Hi Martin, >>> Note, though, that you (as a tool writer) can always combine this >>> logging interface with a PMPI logger and can grab any cleanly defined >>> logging information from there as well. >> Understood. What is still unclear to me, however, is how to >> incorporate the log information at runtime. Usually, I enter the >> wrapper create a timestamped enter-record, do whatever I want/need >> to do, call the PMPI call and create a timestamped exit-record. >> Now, in between I get another timestamped buffer that can only be >> interpreted later on? Then I could also just save the 'blob' with >> my trace and interpret the contents later on. > Yes, that is an option. During the pre-call wrapper, you can enable > the fine grain logging and in the post-call wrapper you can then > access the log buffer with all events that happened in between. > Having an option at that time to save that buffer is a good idea, but > would require the post processing tool to link against the same MPI > on the same machine, since you will get only then the accessor > functions that can interpret the buffer. For a tool like ours it would not be a problem, as we distribute in source anyway, yet, I understand that this is not an option for every tool vendor. I think it should be doable, though, to have 'adapters' for a tool distributed in binary form, that is compiled at installation time, which does not contain any 'business logic' but just the interface to the MPI library. >>> I am not sure if it's worth having the user pick what should be >>> recorded and what not, since this will be very limited anyway. >> The user in this case is not necessarily the end-user but a tool. >> As you said above, a tool might want to combine these logs with the >> information gathered in a wrapper. The tool then might have an >> interest in defining a-priori what it wants to gather, to minimize >> overhead. However, you might be right that this flexibility might >> bear more overhead than a fixed set of predefined sets of logging >> variables. > > This is a question for the MPI implementors about what they prefer or > think is faster. It also depends on how many things/points an > implementation will log. Basically it is a tradeoff between recording > all information and testing which information should be recorded. I I think anything that can be done to reduce trace size is worth to be discussed. > think some MPIs like MPICH already do something like this internally > in debug builds, so it would be good to get some feedback from them > on this issue. Let's see what the discussion brings next time. I am still not sure whether I can make it to the next call. I have a workshop outside of Juelich on Monday till 5:30 PM CEST. I will try to get internet access and get out a little early to join in time, but I cannot promise anything at this moment. >> Do I understand it correctly that the internal data should be >> converted on reading the buffer, or is a post-mortem interface >> possibly the better choice? This way any conversion can be delayed >> until we are no longer in measurement. > > I think either way is fine. As mentioned above, we can add a > mechanism to simply store the whole buffer in raw form into a buffer > provided by the tool and then allow later inspection of it. However, > as also said above, the tool will have to link against that > particular MPI version on that particular platform to allow a correct > interpretation of the data. This should be doable, though, at least > for some post-processing converter. What I didn't think of is that not all tools necessarily build against the MPI library. Thus you are right in that we might need both interfaces, one for the in-measurement conversion and one for post-mortem conversion. I think any post-processing conversion needs to be done on-the-fly by the tools to avoid re-writing the trace data. Best regards, Marc-Andre -- Marc-Andre Hermanns Juelich Supercomputing Centre Institute for Advanced Simulation Forschungszentrum Juelich GmbH D-52425 Juelich Germany Phone : +49-2461-61-2054 Fax : +49-2461-61-6656 eMail : m.a.hermanns(a)fz-juelich.de WWW : http://www.fz-juelich.de/jsc/ JSC is the coordinator of the John von Neumann Institute for Computing and member of the Gauss Centre for Supercomputing Sitz der Gesellschaft: Juelich Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498 Vorsitzende des Aufsichtsrats: MinDir'in Baerbel Brumme-Bothe Geschaeftsfuehrung: Prof. Dr. Achim Bachem (Vorsitzender), Dr. Ulrich Krafft (stellv. Vorsitzender), Prof. Dr. Harald Bolt, Prof. Dr. Sebastian M. Schmidt

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