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dc.contributor.authorRichter, Matthias Rudolph
dc.contributor.authorAamodt, Kenneth
dc.contributor.authorArsene, Ionut Christian
dc.contributor.authorBravina, Larissa
dc.contributor.authorDordic, Olja
dc.contributor.authorEyyubova, Gyulnara
dc.contributor.authorHille, Per Thomas
dc.contributor.authorKolevatov, Rodion
dc.contributor.authorKværnø, Henning
dc.contributor.authorLindal, Svein
dc.contributor.authorLøvhøiden, Gunnar
dc.contributor.authorMilosevic, Jovan
dc.contributor.authorNilsson, Mads Stormo
dc.contributor.authorNyiri, Agnes
dc.contributor.authorSkaali, Toralf Bernhard
dc.contributor.authorTveter, Trine Spedstad
dc.contributor.authorTywoniuk, Konrad
dc.contributor.authorWikne, Jon Christopher
dc.contributor.authorZabrodin, Evgeny
dc.contributor.authorAlme, Johan
dc.contributor.authorBablok, Sebastian Robert
dc.contributor.authorDjuvsland, Øystein
dc.contributor.authorFehlker, Dominik
dc.contributor.authorHaaland, Øystein Senneset
dc.contributor.authorHuang, Meidana
dc.contributor.authorKanaki, Kalliopi
dc.contributor.authorKlovning, Arne
dc.contributor.authorLarsen, Dag Toppe
dc.contributor.authorLiu, Lijiao
dc.contributor.authorNystrand, Joakim
dc.contributor.authorØvrebekk, Gaute
dc.contributor.authorPommeresche, Bjørn-Erling
dc.contributor.authorSkjerdal, Kyrre
dc.contributor.authorUllaland, Kjetil
dc.contributor.authorWagner, Boris
dc.contributor.authorHelstrup, Håvard
dc.contributor.authorHetland, Kristin Fanebust
dc.contributor.authorKileng, Bjarte
dc.contributor.authorRøed, Ketil
dc.contributor.authorPocheptsov, Timur Anatolievich
dc.contributor.authorAltinpinar, Sedat
dc.contributor.authorRøhrich, Dieter
dc.contributor.authorAdamová, Dagmar
dc.contributor.authorAggarwal, Madan M.
dc.contributor.authorAglieri Rinella, Gianluca
dc.contributor.authorAhammed, Zubayer
dc.contributor.authorAhn, Sang Un
dc.contributor.authorAkindinov, Alexander
dc.contributor.authorAleksandrov, Dimitry
dc.contributor.authorAlessandro, Bruno
dc.contributor.authorALICE, Collaboration
dc.PublishedRichter M, Aamodt K, Arsene IC, Bravina L, Dordic O, Eyyubova G, Hille PT, Kolevatov R, Kværnø H, Lindal S, Løvhøiden G, Milosevic J, Nilsson MS, Nyiri A, Skaali TB, Tveter TS, Tywoniuk K, Wikne JC, Zabrodin E, Alme J, Bablok SR, Djuvsland Ø, Fehlker D, Haaland ØS, Huang M, Kanaki K, Klovning A, Larsen DT, Liu L, Nystrand J, Øvrebekk G, Pommeresche B, Skjerdal K, Ullaland K, Wagner B, Helstrup H, Hetland KF, Kileng B, Røed K, Pocheptsov TA, Altinpinar S, Røhrich D, Adamová D, Aggarwal MM, Aglieri Rinella G, Ahammed Z, Ahn SU, Akindinov A, Aleksandrov D, Alessandro B, ALICE C. Online data compression in the ALICE O2 facility. Journal of Physics, Conference Series. 2017;898:032049eng
dc.description.abstractThe ALICE Collaboration and the ALICE O2 project have carried out detailed studies for a new online computing facility planned to be deployed for Run 3 of the Large Hadron Collider (LHC) at CERN. Some of the main aspects of the data handling concept are partial reconstruction of raw data organized in so called time frames, and based on that information reduction of the data rate without significant loss in the physics information. A production solution for data compression has been in operation for the ALICE Time Projection Chamber (TPC) in the ALICE High Level Trigger online system since 2011. The solution is based on reconstruction of space points from raw data. These so called clusters are the input for reconstruction of particle trajectories. Clusters are stored instead of raw data after a transformation of required parameters into an optimized format and subsequent lossless data compression techniques. With this approach, a reduction of 4.4 has been achieved on average. For Run 3, not only a significantly higher reduction is required but also improvements in the implementation of the actual algorithms. The innermost operations of the processing loop effectively need to be called up to O \(10^{11}\) /s to cope with the data rate. This can only be achieved in a parallel scheme and makes these operations candidates for optimization. The potential of template programming and static dispatch in a polymorphic implementation has been studied as an alternative to the commonly used dynamic dispatch at runtime. In this contribution we report on the development of a specific programming technique to efficiently combine compile time and runtime domains and present results for the speedup of the algorithm.en_US
dc.rightsAttribution CC BYeng
dc.titleOnline data compression in the ALICE O\(^2\) facilityen_US
dc.typePeer reviewed
dc.typeJournal article
dc.source.journalJournal of Physics, Conference Series
dc.subject.nsiVDP::Matematikk og naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431
dc.subject.nsiVDP::Mathematics and natural scienses: 400::Physics: 430::Nuclear and elementary particle physics: 431

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