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The Acts project: track reconstruction software for HL-LHC and beyond

dc.contributor.authorGESSINGER, Paul
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorGRASLAND, Hadrien
dc.contributor.authorGRAY, Heather
dc.contributor.authorKIEHN, Moritz
dc.contributor.authorKLIMPEL, Fabian
dc.contributor.authorLANGENBERG, Robert
dc.contributor.authorSALZBURGER, Andreas
dc.contributor.authorSCHLAG, Bastian
dc.contributor.authorZHANG, Jin
dc.contributor.authorAI, Xiaocong
dc.date.issued2020
dc.date.conference2019-11-04
dc.description.abstractEnThe reconstruction of trajectories of the charged particles in the tracking detectors of high energy physics (HEP) experiments is one of the most difficult and complex tasks of event reconstruction at particle colliders. As pattern recognition algorithms exhibit combinatorial scaling to high track multiplicities, they become the largest contributor to the CPU consumption within event reconstruction, particularly at current and future hadron colliders such as the LHC, HL-LHC and FCC-hh. Current algorithms provide an extremely high standard of physics and computing performance and have been tested on billions of simulated and recorded data events. However, most algorithms date back to more than 20 years ago and maintaining them has become increasingly challenging. In addition, they are challenging to adapt to modern programming paradigms and parallel architectures.Acts is based on the well-tested and highly functioning components of LHC track reconstruction algorithms, implemented with modern software concepts and inherently designed for parallel architectures. Multithreading becomes increasingly important to balance the memory usage per CPU core. However, a fully multithreaded event processing framework blurs the clear border between events, which has in the past often been used as a clearly defined validity boundary for event conditions. Acts is equipped with a full contextual conditions concept that allows to run concurrent track reconstruction even in case of multiple detector alignments, conditions or varying magnetic field being processed at the same time. It provides an experiment and, in particular, framework-independent software toolkit and light-weight, highly optimised event data model for track reconstruction. Particular care is given to thread safety and data locality. It is designed as a toolbox that allows to implement and extend widely known pattern recognition algorithms, and in addition suitable for algorithm templating and R&D. Acts has been used as the fast simulation engine for the Tracking Machine Learning (TrackML) Challenge, and will provide reference implementation of several submitted solution programs of the two phases of the challenge.
dc.language.isoen
dc.source.titleEPJ Web Conf.
dc.subject.enactivity report
dc.subject.enCERN LHC Coll: upgrade
dc.subject.entrack data analysis
dc.subject.enprogramming
dc.subject.enperformance
dc.subject.ennumerical calculations
dc.subject.endata management
dc.subject.enmultiprocessor
dc.title.enThe Acts project: track reconstruction software for HL-LHC and beyond
dc.typeCommunication dans un congrès
dc.identifier.doi10.1051/epjconf/202024510003
dc.subject.halInformatique [cs]
bordeaux.page10003
bordeaux.volume245
bordeaux.countryAU
bordeaux.title.proceedingEPJ Web Conf.
bordeaux.conference.cityAdelaide
bordeaux.peerReviewednon
hal.identifierhal-03047516
hal.version1
hal.invitednon
hal.proceedingsoui
hal.conference.end2019-11-08
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03047516v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.btitle=EPJ%20Web%20Conf.&rft.date=2020&rft.volume=245&rft.spage=10003&rft.epage=10003&rft.au=GESSINGER,%20Paul&GRASLAND,%20Hadrien&GRAY,%20Heather&KIEHN,%20Moritz&KLIMPEL,%20Fabian&rft.genre=unknown


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