DD4hep Developers Meeting



Andre Sailer (CERN), Markus Frank (CERN)

Please Join DD4hep developer's meeting via Zoom

DD4hep Developers Meeting
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Marko Petric
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Andre Sailer
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Present:  S. Banerjee, M. Frank, F. Gaede, T. Madlehner, A. Sailer, C. Vuosalo

1) Pending problems

1.1) Pending problems reported by Sang Hyun Ko:
     - Cannot setup Birk's constant as material property.
     - No analogy to G4PVParametrized. Unclear if a solution is possible.
1.2) Add GFlash parameterisation to DDG4 (issue #802)
1.3) PluginFactoryBase::make_return problem with longs (Issue 875)
1.4) ROOT issue: for G4 units the radiation/interaction length is wrong by a factor 10
       -- For CMS this problem does not show up.
       -- Should only enter AFTER simulation (Geant4 materials do not have the radiation length as input)

       -- Need to address this issue early next year.
1.5) DDDigi TBB code needs migration to new oneAPI TBB interfaces (Issue 901):
       Clash between Intel oneapi TBB and classic TBB.
       -- Wouter promised to look into.
1.6) Issue 909: ddsim gets stuck infinitely on some events (reported by T. Madlehner).
        Infinite loop due to particle decaying to itself.
This also may be a generator problem.
1.7) Issue 913: XML parsing with non-standard linux-locale.

2)    Closed issues and fixed problems

2.1) PR 910: Fix to plugin manager: Prevent crash at load time if LD_LIBRARY_PATH is not set.
2.2) PR 911: Add VariantParameters extension + plugin. General purpose parameter map which can be attached to detector elements.
2.3) PR 916, 915, 914: Fixes/improvements of ddsim by Andre. Feature to load multiple xml files.

3) Round table
3.1)  Markus:      EIC software talk about decision making for using DD4hep.
3.2)  Andre:         See above.
3.2)  Frank:         AIDA hackathon will take place 21-23 June.
3.3)  Carl:            DD4hep responsibility in CMS will be passed end of June to Sunanda.
                            Will do regular builds with the DD4hep head.
3.4)  Sunanda:     --

4) AOB

Next meeting:   07. July 2022

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    • 3:30 PM 3:50 PM
      Around the table 20m