CMS Mg5amc@NLO integration

Tuesday Jul 16, 2024, 1:00 PM → 2:00 PM Europe/Zurich

513/1-024 (CERN)

Attendees: Daniele, Zenny, Stefan, Olivier, Robert, Sapta, Jin
Apologies: Andrea

Zenny PhD

    - Got 10 out of 18 needed ECTS points with latest 
    - re-weighting now compiles 
        - OM test it where
        - ZW test it on SM first, then on processes with single parton distribution, multi process events, rebase on the latest version of Madgraph

    - then get back into multi-threading and NLO part again. Currently takes more time than expected. 

CMS integration

    - Daniele pushed a fix for the unzipping, was tested by Jin
    - Daniele profiled Madgraph with internal and external versions of LHAPDF. With external LHAPDF (6.5.2). Versus the internal LHAPDF the speed improvement is around a factor 3 
    - CMS using 6.4
    - Daniele, in the GPU version we call LHAPDF 3 times which should be cached but are not. Daniele will investigate

    - Daniele shows flamegraphs fortran, gpu + int lhapdf, gpu + ext lhapdf
    - Discussion about the serial parts, dsig1, x_to_f_arg

1:00 PM → 1:50 PM Discussion

Speakers: Jin Choi (Seoul National University (KR)), Saptaparna Bhattacharya (Wayne State University (US))

DM: CUDA, FORTRAN with and without LHAPDF