DD4hep Developers Meeting

Thursday 14 Aug 2025, 15:30 → 16:00 Europe/Zurich

zoom

Andre Sailer (CERN), Markus Frank (CERN)

Please Join DD4hep developer's meeting via Zoom

DD4hep Meeting August 14th, 2025

Present:    Andre, Markus, Peter, Thomas

Apologies: --

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Link to minutes of previous meeting

Merged PRs

• PR1482: Make some test optional, fix EventParameter type for EDM4hepOutput (Andre)
• PR1483: Remove unused function in Geant4VolumeManager.cpp (Juan)
• PR1484: Clean up and modernize DetectorImp.cpp (Juan)
• PR1485: Increase the deviation of the number of hits to avoid test failures (Juan)
• PR1486: State that the physicsList argument is deprecated (Brieuc)

Closed PRs, closed issues and fixed problems

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Pending Problems

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• ISSUE1285:  Memory Consumption of Sensitive Detectors
                        ==> Should be handled as illustrated in PR1288. Intrinsic problem of the Geant4VolumeManager;
• 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.
• ISSUE1335:   Uniform random picking of points on detector surfaces for noise studies
                         This problem is linked to #1297 and #580.
• PR1240:        Add multithreading support to ddsim
• PR1314:        Cylinder segment surface (Armin Ilg)
• ISSUE1373:  Add GeneratorInfo to EDM4hepReader (Andre)
• ISSUE1443:  Make user particle handler extensible
                         ---> Maybe we should take advantage and re-collect requirements.
• ISSUE1458: XML file vs TGeoStored geometry in GenFit
• ISSUE1469: Memory leak in Compact2Objects / Detector concerning Headerbug
    ---> See MR #1478
• ISSUE1487: The test t_DDDigi_sim_test_weighted_deposit_overlay can fail (Juan)
    ---> Unstable test
• PR1488:        Use helicity for MCParticle when available (Thomas)
    ---> Enhancement to propagate generator information

Round Table

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Andre:     NTR
Markus:  NTR
Peter:      NTR
Thomas: NTR

AOB

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Next meeting:   August 28th, 2025

15:30 → 15:50 Around the table