Indico has been updated to v3.3. See our blog post for details on this release. (OTG0146394)

2nd Experiments and ROOT Meeting

32/1-A24 (CERN)



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Danilo Piparo (CERN)

Schedules, feedback, discussions between ROOT and experiments / frameworks.

Present: Lorenzo, Marcin, David, Pere, Thomas R., Axel, Vassil, Guilherme, Peter

Executive Summary

- Welcome to Thomas and SHiP!

- Release 6.14/06 is out

- 6.16 rc1is out: the ROOT team would like to encourage the experiments to test it

  - Atlas needs a dev slot for this and ROOT will coordinate this with the LCG team

- Release 6.14/08: it can arrive this week already coupled to a LCG release upon request of ATLAS (Attila)

- Release 6.16: the target is November. Nevertheless, it is our understanding that nobody is blocked by it. We might decide to delay it in case the testing of v6-16-00-patches branch reveals non-trivial problems.


- Danilo: check whether current ATHENA logs contain traces of residual parsing occurrences triggered by searching types in a loop with TClass::GetClass.

- Danilo: communicate to D. Riley and C. Jones the change in ROOT which would avoid nasty task interleaving effects when running parallel simulation jobs.

Round table


- Memory hoarding for streamer infos fixed (ROOT-9725): RSS footprint reduced by 500MB

- Will move to the 6.14 tag tomorrow morning

- Performance numbers will be reported this week


- Improved by about 500 MB limiting autoloading/parsing while getting properties of classes. The scan became harmless


- Every looks good, needs to move to 6.14 patches


- Problems with the ROOT version adopted by FAIRROOT

- VMC also sometimes has issues

- On November the 28th/29th a Data Frame tutorial will take place for SHiP analyzers


There are minutes attached to this event. Show them.
    • 4:00 PM 4:10 PM
      ROOT Team Report 10m
      Speaker: Danilo Piparo (CERN)
    • 4:10 PM 4:15 PM
      ALICE 5m
      Speaker: Peter Hristov (CERN)
    • 4:15 PM 4:20 PM
      ATLAS 5m
      Speaker: Marcin Nowak (Brookhaven National Laboratory (US))
    • 4:20 PM 4:25 PM
      LHCb 5m
      Speaker: Marco Clemencic (CERN)
    • 4:25 PM 4:30 PM
      CMS 5m
      Speaker: David Lange (Princeton University (US))
    • 4:30 PM 4:35 PM
      FairRoot 5m
      Speaker: Dr Mohammad Al-Turany (CERN)
    • 4:35 PM 4:40 PM
      Art 5m
      Speakers: Christopher Green (Department of Physics), Lynn Garren (Fermi National Accelerator Lab. (US))
    • 4:40 PM 4:45 PM
      Belle2 5m
      Speakers: Dr Martin Ritter (LMU / Cluster Universe), Martin Ritter (LMU Munich)
    • 4:45 PM 4:50 PM
      SHiP 5m
      Speaker: Thomas Ruf (CERN)