DD4hep Developers Meeting

Thursday 20 Feb 2025, 15:30 → 16:00 Europe/Zurich

zoom

Andre Sailer (CERN), Markus Frank (CERN)

Please Join DD4hep developer's meeting via Zoom

DD4hep Meeting February 20th, 2024

Present:  A.Sailer, M.Frank, Peter McKneown

Apologies: A.Tolosa Delgado, T.Madlehner

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Link to minutes of previous meeting

Merged PRs

• PR1403: Have more consistent test naming
          ---> Cast out everything using Geant4 in tests : $> ctest -E _sim_
• PR1404: Remove compiler warnings for MacOS
          .... Checked once again compile logs when creating a PR
• PR1405: Enable random seed printout to debug flaky BoxOfStraws example
          ---> New error: apparently G4 steps can pass sensitive volume boundaries.
           Causes trouble, because we use the pre-step touchable to determine
           the sensitive volume.

Pending Problems

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• ISSUE1199: Persist hepmc vertex status code into output
                        ==> Should we eliminate Geant4EventReaderHepMC
                        ==> Decision: Geant4EventReaderHepMC will be removed
• ISSUE1285:  Memory Consumption of Sensitive Detectors
                        ==> Should be handled as illustrated in PR1288. Intrinsic problem of the Geant4VolumeManager;
• ISSUE1296:  DetectorImp::endDocument() called twice for some geometries?
                        ==> Unsure if it is a problem wrongly configuring multiple xml inputs.
• ISSUE1297:  Possible to dump all available readout elements?
                       ==> Possibly a copy of unsolved ISSUE580 from Valentin about enumerating all sensitive cells.
• ISSUE1319: Problem with regexSensitiveDetector and volume IDs
                       ==> Interesting use case for reg-ex sensitive detectors
                               having a VolumeMgr equivalent.
• ISSUE1320:  Replacing a Handle<Segmentation> which contains a MultiSegmentation with the underlying Segmentation
                       ===> Unclear what he really means. Questions after re-reading, calls like:
  

  Handle<SomeSegmentation> seg = multisegmentation->subSegmentation(cellID);
  or
  Segmentation* seg = multisegmentation->subSegmentation(cellID);
  

• ISSUE1335: Uniform random picking of points on detector surfaces for noise studies
              This problem is linked to #1297 and #580.
• ISSUE1373:  Add GeneratorInfo to EDM4hepReader (Andre)
  PR1371:       Read edm4hep (Andre)

• ISSUE1399: ddsim: Vertices of tau and its decay product not matching the information in the input HEPMC file
             ---> Apparently Geant4 problem. Andre has submitted a ticket.

        Pending PRs:(no changes since last meeting):

• PR1240:     Add multithreading support to ddsim
• PR1304:     SurfaceManager: lazily construct surface maps on demand (Leonhard Reichenbach)
• PR1314:     Cylinder segment surface (Armin Ilg)
  
  

        New Pending PRs:

• PR1370:  Feature celeritas integration (Sakib Rahman/EIC)
• PR1377:  Use canonical variables for the installation locations of libraries and binaries (Andriish)
       ==> Idea to have an additional DD4HEP_PLUGIN_PATH and remove dd4hep plugins fdrom the LD_LIBRARY_PATH

Closed issues and fixed problems

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• ISSUE1379: Discussion: Evolution of edm4hep and dd4hep
             ---> Not too much response.

• ISSUE1392:  DD4hep installation fails if Intel compiler is used for compilation
                        ==> Should we support icc ?

• ISSUE1393: DD4hep installation fails if Intel compiler is used for compilation
             ---> Declined, until Intel compiler is supported by SFT.

• ISSUE1400: Question about (Primary) Vertex mismatch - wrong smearing?
             ---> Closed by Andre

• ISSUE1402: CI was failing to install cvmfs, caches removed, works again
             ---> Closed as completed by Andre 

Round Table

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Andre:       NTR
Markus:    NTR
Peter:        NTR

AOB

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Next meeting:   March 6th, 2024

15:30 → 15:50 Around the table