Data analysis for the CMS experiment in the petabyte range at the Vienna Tier-2 centre
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1 FAKT/ÖPG 2009 Natascha Hörmann, Dietrich Liko, Gerhard Walzel Data analysis for the CMS experiment in the petabyte range at the Vienna Tier-2 centre
2 Overview Motivation for Grid computing tektor Performance Studien: HLT Data analysis and data flow at the LHC experiment Vienna Grid Computing Centre Grid Computing Centre Stress test - Step 09 2
3 Motivation for Grid Computing LHC will start at 2009 and run for the next years Proton bunch crossing rate: 40 MHz Different rate of accepted events after Trigger (15/s 5000/s) Different recording rate ( MB/s) ~15 PetaByte/year data to store (~ 15 Mill. GigaByte/year) LHCb ~ 200 MB/s ATLAS ~ 300 MB/s CMS ~ 200 MB/s ALICE ~ 1250 MB/s 3
4 Motivation for Grid Computing in Austria Austrian-Grid Project Federated Tier-2 centre for LHC Austrian Grid User Vienna: CMS experiment Innsbruck: ATLAS experiment Applications in the context of AustrianGrid Computing research, new middleware,... Other applications: Biomed, Healthscience, Weather-forecast,... National Grid Initiative (NGI) lead by the university of Linz 4
5 Grid Structure Tier-0: CERN central centre Saving the experiment data Central data distributor to Tier-1 5
6 11 Tier-1 centre Grid Structure Copies of experiment data Reconstruction of the events Distributor to Tier-2s 6
7 Grid Structure ~160 Tier-2 centres at universities and research centres (and Tier-3) Re-Reconstruction of the events Skimming of the events MC Simulation of the events Data analysis 7
8 Huge amount of analysis data transfer Cumulative transfer volume of Cosmic and MC data over a year Tier-1->Tier-2: ~ 4.0 PetaByte/year 8
9 Monte Carlo Analysis data flow Tier-0 Cern Actual MC sample: SUSY analysis data: Signal (Low Mass SUSY), Background (ttbar, W +Jets, Z+Jets, QCD) Experiment Tier-1 Tier-1 Tier-1 Tier-1s MC Production and reconstruction of data Duration: 2 months Datasets: 100 TB Tier-2 Vienna Tier-2 Tier-2 Re-Skimming (Vienna) Duration: 1 week SUSY Skim: 1.7 TB Tier-2s Interactive analysis Grid Job submission Duration: 1-5 hours Skimming (PAT) (Physics Analysis Tools) Duration: 1 month SUSY Skim: 10 TB 9
10 Vienna Tier-2 centre Federated Tier-2 Vienna-Innsbruck (Austrian Grid) Resources at T2-Vienna Actual: 420 CPUs, 125 TeraByte Available: 1000 CPUs, 500 TeraByte Storage Element Supermicro RAID DataPoolManager (DPM) Computers Sun (Dual Quad (2x4) Core CPU s) Intel Xenon 2,5 GHz Linked via the university of vienna to the European Network GEANT2 10
11 Data transfers between Tiers Commissioning of the Tier-1 and Tier-2 links Reach defined transfer-rate over a period Tier-1: transfer rate > 20 MB/s for 1 day Tier-2: transfer rate > 5 MB/s for 1 day Tested periodically Tier-1,Tier-2 -> Tier-2 Vienna, links successfully commissioned 11
12 Transfers to Tier-2 Vienna Test data transfer rate over a year Av. transfer rate: 4.2 MB/s Cumulative transfer volume: 128 TeraByte/year 12
13 Computer Centre Stress Test Step 09 Scale Testing for the Experimental Program in 2009 Testing the Grid Infrastructure in June 2009 Tier-0 tests Testing to write to tape for several days Tier-0 and Tier-1 tests Testing the read/write on tape/disc Reconstructing and skimming datasets Testing Tier-1, Tier-2 transfers Tier-2 tests Testing Job submission 13
14 Job Stress Test Step 09 Results of the analysis jobs at the Tier-2s (June 2009) analysis jobs with a runtime of 4h during 2 weeks sent to T2-Vienna Successful: 96.4 % 14
15 Results - Step 09 Results of the analysis jobs at the CMS Tier-2s (June 2009): Successful finished jobs: o %: 24 Tier-2s o %: 7 Tier-2s o < 80 %: 19 Tier-2s 15
16 Vienna Tier-2 for everyone? What do you need? Grid Certificate User Interface installed on your local PC User Software installed or submitted with the job Starting cooperation with the technical university vienna/ theoretical physics institute: Thermodynamic simulation of quark gluon plasma Existing cooperation with the medical university vienna/ MedAustron: Simulations for radiation therapy using hadrons Interested in using the Vienna Grid Infrastructure? Our Grid experts at HEPHY will help you 16
17 Summary Physics analysis at LHC as well as other fields like biomedicine, weather-forecast has extremely high requirements on computer resources Testing the computing infrastructure before the LHC startup is extremely important Successful analysis stress test of the CMS Grid Infrastructure has taken place but there is still a lot to improve e.g. transfer rate and reliability Everyone can use the grid infrastructure 17
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