Multi-threaded software framework development for the ATLAS experiment

G A Stewart; J Baines; T Bold; P Calafiura; A Dotti; S A Farrell; C Leggett; D Malon; E Ritsch; S Snyder; V Tsulaia; P Van Gemmeren; B M Wynne; for the ATLAS Experiment

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Multi-threaded software framework development for the ATLAS experiment

机译：用于ATLAS实验的多线程软件框架开发

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ATLAS'scurrentsoftwareframework,Gaudi/Athena,hasbeenverysuccessfulfortheexperimentinLHCRuns1and2.However,itssingle-threadeddesignhasbeenrecognisedforsometimetobeincreasinglyproblematicasCPUshaveincreasedcorecountsanddecreasedavailablememorypercore.Eventhemulti-processversionofAthena,AthenaMP,willnotscaletotherangeofarchitecturesweexpecttousebeyondRun2.ATLASexaminedtherequirementsonanupdatedmulti-threadedframeworkandlaidoutplansforanewframework,includingbettersupportforHighLevelTriggerusecases,in2014.Inthispaperwereportonourprogressindevelopingthenewmulti-threadedtaskparallelextensionofAthena,AthenaMT.ImplementingAthenaMThasrequiredmanysignificantcodechanges.Progresshasbeenmadeinupdatingkeyconceptsoftheframework,allowingdifferentlevelsofthreadsafetyinalgorithmiccode.Substantialadvanceshavealsobeenmadeinimplementingadataflowcentricdesign,aswellasonthedevelopmentofthenew'eventviews'infrastructure.TheseeventviewssupportpartialeventprocessingandareanessentialcomponenttosupporttheHighLevelTrigger'sprocessingofcertainregionsofinterest.AmajorefforthasalsobeeninvestedtohaveanearlyversionofAthenaMTthatcanrunsimulationonmanycorearchitectures,whichhasaugmentedtheunderstandinggainedfromworkonearlierATLASdemonstrators...

机译：ATLAS'scurrentsoftwareframework，高迪/雅典娜，hasbeenverysuccessfulfortheexperimentinLHCRuns1and2.However，itssingle-threadeddesignhasbeenrecognisedforsometimetobeincreasinglyproblematicasCPUshaveincreasedcorecountsanddecreasedavailablememorypercore.Eventhemulti-processversionofAthena，AthenaMP，willnotscaletotherangeofarchitecturesweexpecttousebeyondRun2.ATLASexaminedtherequirementsonanupdatedmulti-threadedframeworkandlaidoutplansforanewframework，includingbettersupportforHighLevelTriggerusecases，in2014.Inthispaperwereportonourprogressindevelopingthenewmulti-threadedtaskparallelextensionofAthena，AthenaMT.ImplementingAthenaMThasrequiredmanysignificantcodechanges.Progresshasbeenmadeinupdatingkeyconceptsoftheframework，allowingdifferentlevelsofthreadsafetyinalgorithmiccode.Substantialadvanceshavealsobeenmadeinimplementingadataflowcentricdesign，aswellasonthedevelopmentofthenew'eventviews' Seevent Views支持部分事件处理和重要组件以支持HighTr igger对某些特定区域的处理。Amajoreffort也已经投入了雅典娜MT的早期版本，可以在许多核心体系结构上进行模拟，这有助于从较早的ATLAS示威者那里获得理解。

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《Journal of Physics: Conference Series》 |2016年第1期|共页
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G A Stewart; J Baines; T Bold; P Calafiura; A Dotti; S A Farrell; C Leggett; D Malon; E Ritsch; S Snyder; V Tsulaia; P Van Gemmeren; B M Wynne; for the ATLAS Experiment;
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Multi-threaded software framework development for the ATLAS experiment

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