DD4hep Developers Meeting

Thursday 17 Jul 2025, 15:30 → 16:00 Europe/Zurich

zoom

Andre Sailer (CERN), Markus Frank (CERN)

Please Join DD4hep developer's meeting via Zoom

DD4hep Meeting July 17th, 2025

Present:    Andre, Juan

Apologies: Markus, Thomas

---

Link to minutes of previous meeting

Merged PRs

• #1474: PDGFile: more documentation to mention secondary vertices
• #1471: Exit in signal handlers with code (128+signal-number)
• #1470: Fix typos

Closed PRs, closed issues and fixed problems

---

• ISSUE1473: How do I tell ddsim about simulating my beyond standard model particle?
  • #1474: PDGFile: more documentation to mention secondary vertices
• ISSUE1472: DDSim creates an extra event when numberOfEvents exceeds HEPMC input sizebug
  • #1471: Exit in signal handlers with code (128+signal-number)
• ISSUE1468: SIGTERM results in 0 retcode
• ISSUE1467: ddsim part.minimalKineticEnergy default value
• #1470: Fix typos

Pending Problems

---

• 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
• PR1304:        SurfaceManager: lazily construct surface maps on demand (Leonhard Reichenbach)
• 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
• 
  
  New issues:
• ISSUE1469: Memory leak in Compact2Objects / Detector concerning Headerbug
•  

Round Table

---

Andre:    

AOB

---

Next meeting:   July 31, 2025

1 Around the table