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Computing at LHC

Computing at LHC. Hiroshi Sakamoto International Center for Elementary Particle Physics, the University of Tokyo. Contents. LHC Atlas Experiment Computing Requirements ATLAS Computing Model Distributed Analysis on a Data Intensive Computing Grid Worldwide LHC Computing Grid Project

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Computing at LHC

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  1. Computing at LHC Hiroshi Sakamoto International Center for Elementary Particle Physics, the University of Tokyo

  2. Contents • LHC Atlas Experiment • Computing Requirements • ATLAS Computing Model • Distributed Analysis on a Data Intensive Computing Grid • Worldwide LHC Computing Grid Project • Computing System Commissioning • Grid Technology: Can be a Common Solution for Future High Energy Physics Programs?

  3. LHC Atlas Experiment • LHC – Large Hadron Collider • Atlas – A Toroidal LHC ApparatuS

  4. CERN Council looks forward to LHC start-up (CERN Press Release, June 20th, 2008) “The accelerator, detectors and computing are all on course,” said CERN Director General Robert Aymar, “and we are looking forward to the earliest possible LHC start-up.”

  5. Installing the beam pipe at the ATLAS experiment on 16 June: the final section of the LHC. Once all sectors are cold, electrical testing will be concluded in readiness for first beams, currently scheduled for August.

  6. Computing Requirements • Basic Parameters

  7. Input Parameters Reconstruction: 15kSI2ksec/event – 3000kSI2k (200Hz) Simulation: 400kSI2ksec/event – 4000kSI2k (10Hz)

  8. Atlas Computing Model • Tier Model ~ Hierarchy • Tier0: CERN • Tier1: Quasi-Online Data Center • Tier2: National/Regional Analysis Center • Tier3: Department Facility • Tier4: User Desktop • Tier0 ~ Tier2 are operated under MoU

  9. Distributed Analysis on Data Intensive Computing Grid • Data Grid ( Data Intensive Computing Grid ) • Building Blocks • Authentication/Authorization • Workload Management • Distributed Data Management • Information/Monitoring/Accounting

  10. Authentication/Authorization VO (Virtual Organization) – Roles – Groups

  11. Workload Management Sophisticated Match Making Massive Job Subscription

  12. Distributed Data Management Storage resource allocation Efficient and reliable file transfer

  13. Worldwide LHC Computing Grid Project • Collaboration Body • Contribution to LHC Experiments • Memorandum of Understanding in the framework of WLCG collaboration • Federated Grids • EGEE/gLite • OSG • NorduGrid

  14. CPU(MSI2k-days) Tier1 Disk(TB) Tier1 Tape(TB) Tier1

  15. Future Requirements v.s. Pledges

  16. Computing System Commissioning • Full Dress Rehearsal • Full scale test using simulated data • Combined Computing Readiness Challenge (CCRC08) • Simultaneous operation of 4 experiments

  17. Atlas Full Dress Rehearsal

  18. Grid Technology: Can be a Common Solution for Future High Energy Physics Programs? • Technical Point of View • Scalability ~ O(100) sites, O(100k) CPU, O(10PB) disk, O(100k) jobs/day, O(10M) files, O(10GB/s) transfer, O(10k) users, O(100) VOs • Minimum functionality for HEP experiments • Still needs high operation cost ~ manpower • Collaborative Point of View • Accessibility ~ Equivalent to all collaborators • Global infrastructure ~ Communication! • Political/Financial Point of View • Visibility ~ Recognized in your institute/country • You must/can provide your own resources

  19. But, you already have… Eric Yen, ISGC08

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