Heterogeneous Architectures in WLCG

3 Dec 2025, 08:00 → 5 Dec 2025, 18:00 Europe/Zurich

31/3-004 - IT Amphitheatre (CERN)

Alessandro Di Girolamo (CERN), David Britton (University of Glasgow (GB)), James Letts (Univ. of California San Diego (US)), Lorenzo Moneta (CERN), Simone Campana (CERN), Sofia Vallecorsa (CERN), Stefan Roiser (CERN), Tommaso Boccali (INFN Sezione di Pisa)

Wednesday 3 December

08:00 → 09:00 Welcome coffee & pastries

09:00 → 10:30 Progress of Experiments and Software Projects: Session A

Progress of experiments and software projects, and how they will interact with a heterogeneous WLCG environment:
* Experiments
* Common Software (SFT, NGT)
* Simulation
* Generators

Conveners: Alessandro Di Girolamo (CERN), James Letts (Univ. of California San Diego (US))

09:00 LHCb - tbc

09:45 ATLAS - tbc

10:30 → 11:00 Coffee break

11:00 → 12:30 Progress of Experiments and Software Projects: Session B

Progress of experiments and software projects, and how they will interact with a heterogeneous WLCG environment:
* Experiments
* Common Software (SFT, NGT)
* Simulation
* Generators

Conveners: Alessandro Di Girolamo (CERN), James Letts (Univ. of California San Diego (US))

11:00 ALICE - tbc

Speaker: Irakli Chakaberia (Lawrence Berkeley National Lab. (US))

11:45 CMS - tbc

12:30 → 14:00 Lunch

14:00 → 15:30 Progress of Experiments and Software Projects: Session C

Progress of experiments and software projects, and how they will interact with a heterogeneous WLCG environment:
* Experiments
* Common Software (SFT, NGT)
* Simulation
* Generators

Conveners: Alessandro Di Girolamo (CERN), James Letts (Univ. of California San Diego (US)), Stefan Roiser (CERN)

14:00 Madgraph event generation

Speaker: Daniele Massaro (CERN)

14:30 Adept detector simulation

Speaker: Severin Diederichs (CERN)

15:00 NGT WP1

Speaker: Axel Naumann (CERN)

15:30 → 16:00 Coffee break

16:00 → 17:30 Progress of Experiments and Software Projects: Session D

Progress of experiments and software projects, and how they will interact with a heterogeneous WLCG environment:
* Experiments
* Common Software (SFT, NGT)
* Simulation
* Generators

Conveners: Alessandro Di Girolamo (CERN), James Letts (Univ. of California San Diego (US)), Stefan Roiser (CERN)

16:00 Pepper (Sherpa on GPU) event generation

Speaker: Max Knobbe (Fermilab)

16:30 Celeritas detector simulation

Speaker: Seth Johnson (Oak Ridge National Laboratory (US))

Thursday 4 December

08:00 → 09:00 Welcome coffee & pastries

09:00 → 12:30 AI/ML activities

• Multi-GPU benchmarks (examples such as ML Tracking per ATLAS, Reconstruction on * * HGCAL, FlashSim, Fastsim, MLPF, online)
• Lessons learned: Setting up scalable infrastructure from NextGEN (Ricardo)
• Looking ahead, e.g. Large Physics Models and Federated learning for HEP data

Conveners: Alessandro Di Girolamo (CERN), James Letts (Univ. of California San Diego (US)), Lorenzo Moneta (CERN), Stefan Roiser (CERN)

10:30 Coffee break

14:00 → 17:25 Offering from Sites and requirements for future provisioning

• Current offering from sites and discussion of requirements for future provisioning:
• Site presentations, e.g. US ATLAS, US CMS, European view, CERN. Dicsussion at the end of the sites presentation.
• Benchmarking - status, plans and key milestones
• Provisioning and pledge discussion

14:00 Benchmarking - status, plans and key milestones

Speaker: Domenico Giordano (CERN)

14:30 Experience in Italy

Speaker: Daniele Cesini (Universita e INFN, Bologna (IT))

14:50 Experience in Germany

Speaker: Tim Voigtlaender (KIT - Karlsruhe Institute of Technology (DE))

15:10 Experience at CERN - TBC

15:30 Coffee break

16:00 Experience in U.S. (CMS)

Speaker: Dirk Hufnagel (Fermi National Accelerator Lab. (US))

16:20 Experience in U.S. (ATLAS) - TBC

16:40 Provisioning and Pledge Discussion

e.g., SONIC

Friday 5 December

08:00 → 09:00 Welcome coffee & pastries

09:00 → 12:30 Closing Session

Closing Session to discuss, summarize, and define the work plan and next steps.

Conveners: Alessandro Di Girolamo (CERN), James Letts (Univ. of California San Diego (US)), Lorenzo Moneta (CERN), Stefan Roiser (CERN)

10:30 Coffee break