Public Minutes of 141st Steering Board, 12 June 2025

Present: Alberto Ribon, Dmitri Konstantinov, Ben Morgan, Soon Yung Jun, Gabriele Cosmo, Luis Sarmiento Pico, Sebastien Incerti, Krzysztof Genser, Ivana Hrivnacova, Francesco Romano, Daren Sawkey, Marc Verderi, Witek Pokorski, Igor Semeniouk, Makoto Asai, Alvaro Tolosa-Delgado, Alexander Howard, Alexei Sytov, Vladimir Ivantchenko , John Apostolakis, John Allison (number: 21)

Excused: Shogo Okada, Mihaly Novak

1. Status of computing performance benchmarks

  The CPU performance of Geant4 in the 11.3 series has remained stable,
  with no significant regressions observed so far.
  The observed memory increase in the single-particle samples starting
  from ref03 is due to the retrieval of additional cross-section data
  during initialization - for example, from
  G4NeutronInelasticXS::Initialise. However, this increase is not
  noticeable in the Higgs sample after the last event, as the added memory
  at initialization is relatively small compared to the total memory
  footprint of more complex events.

2. Open bug reports

  Most of the meeting was devoted to the review of open bugs, with
  several updates being made.

3. Status of the 11.4.beta release

  In progress. Some remaining issues on Windows, due to platform/hardware
  problems.
  Release date on Thursday 26th June.

4. Update on the copyright holders

  CEA Saclay and LLNL (Lawrence Livermore National Laboratory) have been
  added.

5. Status of the delta-assessment of AdePT & Celeritas

  The assessment report - for the delta-assessment of AdepT & Celeritas
  held on 26/27 March - is expected by the end of June.

6. Future events

  Geant4 course at the XXII Seminar on Software for Nuclear, Subnuclear
  and Applied Physics, Porto Conte Alghero (Italy), 8-13 June 2025,
  https://agenda.infn.it/event/44438/

  Geant4 Tutorial Course at Jefferson Lab, Jefferson Lab, Newport News,
  Virginia (USA), 18-21 August 2025,
  https://indico.jlab.org/event/963/

  Introductory lessons and hands on Geant4 at the 2nd Intensive School
  in Laser, Plasma & Fusion, Budva, Montenegro, 22-25 September 2025,
  https://school2025.ca-probono.eu/

  Next Technical Forum on October 23rd,
  https://indico.cern.ch/event/1554191/manage/timetable/#20251023

Meeting Date Thursday, June 12, 2025 - 16:00 CET