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CBM Online Meeting

→ Europe/Berlin
Virtual

Virtual
Beschreibung

Zoom: see below

CBM Software Meeting
Zoom Meeting ID
91452703794
Host
Volker Friese
Zoom URL
    • 15:00 → 15:30
      Recent updates to the software stack 30m
      • Updates to VT-feeder (!2353)
      • KFP-selector (!2377)
      • QA in multi-threaded environment (!2379)
      • Global tracking (CPU)
      • Tracking (GPU)
      Sprecher: Bartosz Sobol (Jagiellonian University), Dr. Grigory Kozlov (Goethe-Universität Frankfurt am Main), Sergei Zharko (GSI Helmholtzzentrum für Schwerionenforschung GmbH(GSI)), Sergey Gorbunov (GSI Helmholtzzentrum für Schwerionenforschung GmbH(GSI))
      • VTFeeder: feature complete.
      • KFPF: MR pending (MR 2377). In the current approach, the event selector(s) set a  flag in the CbmEvent structure. The final selection then loops over the events and selects those with the proper flag.
      • Multithreaded QA: done. The needed plots have to be defined (collection in a Redmine ticket).
      • Tracking on CPU:  STS-local and global tracking are available both with timeslice and with event input. Global tracking is about 50% slower, which is to be investigated. There is a 20% inefficiency when attaching TOF hits, which also needs to be understood. There is some minor problem with TRD and TOF hits (the hit finders do not deliver them time-sorted), which has lower priority.
      • Tracking on GPU: A MR will be finished otday. There is a problem with running STS ereconstruction on CPU and tracking on GPU. The STS hit finder allocates (too much) fixed memory on GPU; settings to tune the memory usage are required. The GPU tracker can be used on event input, but in this case no large acceleration is expected.
      • DDS: Progress on the SCA (close to ready). Tests were done locally; tests on VIRGO still need to be done. A fix for timers and monitors with XPU is already merged.

      S. Gorbunov reports that the amount of STS hits is smaller by a factor of three compared to event-by-event simulation. This needs to be verified and understood / fixed with high urgency.

       

    • 15:30 → 16:00
      Benchmarks of the online binary 30m
      Sprecher: Andreas Redelbach (Frankfurt Institute for Advanced Studies(FIAS))

      The benchmark numbers still refer to timeslice processing, not to event-by-event reconstruction. Scaling with the number of threads is observed, but with a slope much smaller than unity.