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Science Computing grid tested on Large Hadron Collider
Science Computing grid tested on Large Hadron Collider | Computing grid tested on Large Hadron Collider |
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| by William Atkins | |
| Sunday, 05 July 2009 | |
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Page 2 of 2 In fact, CERN states that they are running “close to 1M [megs, or megabytes] analysis jobs and achieving 6GB/s [gigabytes per second], of ‘Grid traffic’, the equivalent of a DVD worth of data a second, sustained over long periods.” Featured Whitepaper
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Science DiscussionsCERN states, “With the restart of the LHC only months away, one can expect a large increase in the number of Grid users: from several hundred unique users today to several thousand when data taking and analysis commences.” Such an increase in the number of users can only happen when the WLCG is running at optimal performance. Sergio Bertolucci, director of research and computing at CERN, said: “The 4 LHC experiments – ATLAS [A Toroidal LHC ApparatuS], CMS [Compact Muon Solenoid], ALICE [A Large Ion Collider Experiment], and LHCb [Large Hadron Collider beauty]—have demonstrated their ability to manage their nominal data rates concurrently. For the first time all aspects of the experiments’ computing were exercised simultaneously: simulation, data processing and analysis. This gives them the confidence that they will be able to efficiently analyze the first data from the LHC later this year.” [CERN] Bob Jones, director of the EGEE [Enabling Grids for E-sciencE] project. remarked. “such a significant achievement is also a valuable testament to the state of maturity of the EGEE infrastructure and its ability to interoperate with major Grid infrastructures in other parts of the world. Ensuring that this level of service continues uninterrupted as we transition from EGEE to EGI is clearly essential to our users, including flagship communities such as High Energy Physics.” Ruth Pordes, executive director of the Open Science Grid consortium, also stated in the CERN press release, "This is another significant step to demonstrating shared infrastructures can be used by multiple high throughput science communities simultaneously. ATLAS and CMS are not only proving the usability of OSG [Open Science Grid], but contributing to maturing national distributed facilities in the U.S. for other sciences." David Britton, the GridPP [U.K. Computing for Particle Physics] Project Leader, reported, “In the UK, STEP09 ran very smoothly at the majority of sites, which allowed the focus to be on understanding the performance and tuning the infrastructure. The RAL Tier-1 performed exceedingly well with only a single out-of-hours call out over the two week period. Valuable information was obtained on the performance of tape-drives under realistic workflows; the OPN network was tested by laying down additional UDP traffic on top of the STEP09 data; and the fairshare system was successfully tuned to balance the load between experiments.” Gonzalo Merino, manager of the Tier1 centre in Barcelona, said, "The Spanish WLCG sites met the STEP09 targets. It has been a very valuable exercise since many of the experiment workflows have been tested simultaneously at unprecedented scale, well above the nominal values for LHC data taking. The Tier-1 at PIC has provided a very stable and reliable service at record breaking levels: exchanging up to 80 Terabytes per day with other WLCG sites and processing data at more than 2 GBytes per second. This gives us confidence that the Spanish WLCG sites are ready for data taking." David Foster, head of the LHC Optical Private Network activity, concluded, "The LHC Optical Private Network transporting data between the sites has proven its capability both in terms of performance and resiliency during STEP'09. New capabilities emerging in the 40Gbps and 100Gbps range should enable us to keep up with the anticipated data distribution needs of the LHC experiments." |
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