Go to the Indico Home Page Oldest event Older event Up to category Newer event Newest event Printable version
  • Compact style
  • Indico style
  • Indico style - inline minutes
  • Indico style - numbered
  • Indico style - numbered + minutes
  • Indico Weeks View
    • Switch to the management area of this event
    Login

    EP R&D Software Working Group Meeting

    → Europe/Zurich
    Zoomiverse

    Zoomiverse
    Live Notes
    EP R&D Software Working Group Meeting
    Zoom Meeting ID
    62893115044
    Host
    Graeme A Stewart
    Alternative host
    Andre Sailer
    Useful links
    Join via phone
    Zoom URL
    Hide
     

    Software R&D Working Meeting Minutes

    2021-12-15

    Apologies: André

    Introduction

    No date yet for R&D 2021 report input - we anticipate end of January or into February.

    ACTS paper has been accepted in CSBS, which is our first EP R&D supported journal article - congratulations!

    Track Reconstruction

    For Python examples, is parallelism available? (Or is it not used for multi-threaded jobs?).

    • For parallelism TBB is used

    Delegate<> is very lightweight and hides complexity from the compilation unit.

    Acts::SourceLink is similar, very light baseclass.

    Valentin - reduction of build resources is very welcome; DD4hep and Gaudi use ninja as a backend build tool, that helps reduce the build resources by controlling parallelism.

    New fitters in good shape - production ready early next year.

    Surface becomes a thin volume, which simlifies navigation a lot. How does this relate to the GPU work?

    OpenDataDetector has realistic passive material, which is relly important for realism.

    Erica - on the material budget, how did you model things? Is it detailed or an average? And does the solenoid really contribute?

    • The solenoid really is outside, but it is an option and would be important for a calorimeter
    • Short stips end material budget is for services, cables and cooling
    • Serious discussions on having the ODD with a calorimeter and with some muon stations as well
      • Will be indepedent of ACTS plugins, using vanilla DD4hep
      • Gives us reach into the anaysis/CP realm
      • Graeme - we should probably have a dedicated meeting on the ODD next year

    John - what does the name ‘portal’ represent? It seems a bit confusing.

    • They are interfaces between volumes, that carry you from one volume into another.
    • The complexity goes down a lot with these portals and it works very well in detray, which is why it has been ported back into the core
      • This is used in the fast simulation; in full sumulation it’s probably too complex to use this setup

    Pere - a philisophical question… the simplifications seem to reimplement functionality that exists elsewhere, e.g., the configuration could be handled by Gaudi, and also for the Python bindings

    • Yes, but we could not tie ourselves to Gaudi
    • Tools were deliberately got rid of, which was to remove of virtual function calls that exist in Gaudi

    Pere - So is C++ the wrong language for this?

    • There is so much experience in C++ though; the Run 1 ATLAS experience was that too much flexibility cost a great deal in runtime and in complexity
      • There is a line between internal exposure for experts (at compile time) and external exposue, which is a runtime issue
     
    There are minutes attached to this event. Show them.