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The Challenges of LHC Computing

The Challenges of LHC Computing. Visit of Michael Dell. Frédéric Hemmer IT Department 26 th January 2010. The LHC Computing Challenge. Signal/Noise: 10 -13 (10 -9 offline) Data volume High rate * large number of channels * 4 experiments  15 PetaBytes of new data each year

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The Challenges of LHC Computing

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  1. The Challenges of LHC Computing Visit of Michael Dell Frédéric Hemmer IT Department26th January 2010 Frédéric Hemmer

  2. The LHC Computing Challenge • Signal/Noise: 10-13 (10-9 offline) • Data volume • High rate * large number of channels * 4 experiments • 15 PetaBytes of new data each year • Compute power • Event complexity * Nb. events * thousands users • 100 k of (today's) fastest CPUs • 45 PB of disk storage • Worldwide analysis & funding • Computing funding locally in major regions & countries • Efficient analysis everywhere •  GRID technology Frédéric Hemmer

  3. Collision in an LHC detector Frédéric Hemmer

  4. On-line data reduction Frédéric Hemmer

  5. Tier 0 at CERN: Acquisition, First pass processingStorage & Distribution Frédéric Hemmer

  6. Tier 0 – Tier 1 – Tier 2 • Tier-0 (CERN): • Data recording • Initial data reconstruction • Data distribution • Tier-1 (11 centres): • Permanent storage • Re-processing • Analysis • Tier-2 (~130 centres): • Simulation • End-user analysis Frédéric Hemmer

  7. 2009 Tier 0-1 Data Transfers Preparation for LHC startup LHC physics data Final readiness test (STEP’09) More than 8 GB/s peak transfers from Castor fileservers at CERN

  8. Grid Activity – distribution of CPU delivered • Distribution of work across Tier0/Tier1/Tier 2 really illustrates the importance of the grid system • Tier 2 contribution is ~ 50%; • >85% is external to CERN Tier 0 + Tier 1 sites Tier 2 sites Frédéric Hemmer

  9. Similarity Search Measurement of Pulmonary Trunk Temporal Modelling RV and LV Automatic Modelling Visual Data Mining Surgery Planning Genetics Profiling Treatment Response Personalised Simulation Inferring Outcome Semantic Browsing Biomechanical Models Tumor Growth Modelling

  10. CERN Computing – Tier 0 in numbers • Computing – CPU: • 6300 systems / 39k cores (+ planned 2400 systems, 16k cores) • Used for CPU servers, disk servers, general services • Computing – disk: • 14 PB on 42.5k disk drives (+ planned 19 PB on 20k drives) • Computing – tape: • 34 PB on 45k tape cartridges • 56k tape slots in robots, 160 tape drives • Computer centre: • 2.9 MW usable power, + ~1.5 MW for cooling Frédéric Hemmer

  11. CERN openlab in brief • A science – industry partnership to drive R&D and innovation • Started in 2002, now in phase 3 Motto: “you make it – we break it” • Evaluates state-of-the-art technologies in a very complex environment and improves them • Test in a research environment today what will be used in industry tomorrow • Training: • openlab student programme • Topical seminars • CERN School of Computing January 2010

  12. openlab phase III • Covers 2009-2011 • Status • Partners: HP, Intel, Oracle and Siemens • New topics • Global wireless coverage for CERN (HP) • Power-efficient solutions (Intel) • Performance Tuning (Oracle) • Control systems and PLC security (Siemens) • Advanced storage systems and/or global file system (partner to be identified) • 100Gb/s networking (partner to be identified) January 2010

  13. openlab people: students in 2009 Summer 2009

  14. Frédéric Hemmer

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