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Future Compute needs

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Vincent Garonne (University of Oslo)

AHM 2021-1, 2021-03-05

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LHC / HL-LHC Schedule

Run-3: 2022 - 2024, Run-4 with HL-LHC from mid-2027

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Estimates

  • The estimate on ATLAS and ALICE computing demands are based on the inputs provided by the experiments
    • ATLAS:
      • Run-3: Sustained budget model with +10% resources capacity increases per year
      • HL-LHC : Updated Computing Computing Conceptual Design Report
    • ALICE
      • Sustained budget model with +20% resources capacity increases per year for the same periods

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Updated Computing Conceptual Design Report

https://cds.cern.ch/record/2729668

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Estimates for ATLAS: HL-LHC

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ALICE Estimates

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Now

2025

2030

CPU [kHS06]

55.41

100.8

250.9

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ATLAS Estimates

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Now

2025

2030

CPU [kHS06]

76.3

259.1

1014.7

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Workload management service

  • ATLAS with ARC

⇒2025: Factor 2, 2030: Factor 13

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  • ALICE

⇒2025: Factor 2, 2030: Factor 5

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  • Network ?

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ATLAS: Simultaneous jobs

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ATLAS: Jobs done

  • 500 K jobs done / Month

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Data traffic for ATLAS Jobs

In average, an ATLAS job needs:

  • Download: 7 files, 4 GB
  • Upload: 2 files, 275 MB

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ARC Cache Usage

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ALICE: Jobs done

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ALICE: Simultaneous jobs

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