Madgraph5 GPU development

Tuesday 29 Sept 2026, 16:00 → 17:00 Europe/Zurich

513/R-070 - Openlab Space (CERN)

16:00 → 16:10 News

16:10 → 16:30 Topical discussion

Speaker: Dr All

Agenda

Actions

• Move next meeting back 1 h for next time.
• Slot for Medhi next meeting.

Frantisek

• Create a PR to update the MadGraph 7 UI prompt, initially using blue, with an option to disable/configure the color.
• Update MG5 references to MG7 in the interface as part of the UI changes.
• Update and push the code-splitting PR toward merging as soon as possible.

Daniele

• Rerun the MadGraph7 performance and cross-section validation on a smaller subset of processes.
• Investigate the observed MadGraph5 vs MadGraph7 cross-section discrepancies.
• Investigate unexpected throughput results, including cases where CPU and GPU performance appear identical, using sequential rather than parallel runs.

Olivier

• Merge MadGraph5 v3.8.0 into MadGraph7.
• Port the quarkonia/leptonium features to MadGraph7.

Open points

• Resolve the MLM/polarization issues with mixed expansions, where diagram identification and weight evaluation currently depend on each other.
• Joon-Bin message about CMS validation: gridpack size and so on, maybe decide a strategy, make a GitHub issue and so on so we are transparent.

16:30 → 16:50 Round table

16:50 → 17:00 AoB