Abstract

ATLAS software and computing is in a period of intensive evolution. The current long shutdown presents an opportunity to assimilate lessons from the very successful Run 1 (2009–2013) and to prepare for the substantially increased computing requirements for Run 2 (from spring 2015). Run 2 will bring a near doubling of the energy and the data rate, high event pile-up levels, and higher event complexity from detector upgrades, meaning the number and complexity of events to be analyzed will increase dramatically. At the same time operational loads must be reduced through greater automation, a wider array of opportunistic resources must be supported, costly storage must be used with greater efficiency, a sophisticated new analysis model must be integrated, and concurrency features of new processors must be exploited. This paper surveys the distributed computing aspects of the upgrade program and the plans for 2014 to exercise the new capabilities in a large scale Data Challenge.

Highlights

  • ■ Simulation ■ Reconstruction ■ Infrastructure ■ Data and analysis models ● Major rework of main distributed computing tools ■ Distributed Data Management: DQ2 -> Rucio, data federation ■ Workload management: ProdSys2+PanDA ■ EventIndex, Event Service ■ Opportunistic resources: HLT farm, SuperComputers, Boinc ● Data Challenge DC14

  • ● ISF allows for the following: ■ Mixing of fast and full simulation within a physics event ■ Uniform truth handling by all simulation flavours ■ Consistent detector boundaries by all simulation flavours ■ Complex schemes for routing particles

  • ● It's all coming together about :

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Summary

On behalf of the ATLAS Collaboration

● Run[2] is more than Run[1] at higher energies ● Technology improvements in software. ■ Over 150k concurrent jobs running ■ 350 M jobs completed in 2013 ■ production and simulation but

Integrated Simulation Framework
Optimisation of CPU usage
New Analysis Data Model
New Analysis Flow Model
Xrootd Data Federation
Panda infrastructure
Boinc Client Shared Directory
Draft schedule
Full Text
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