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Data Analysis – Team #3

Data Analysis – Team #3. ROOT as a framework for AGATA. O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro. What is behind « T3 » ?. Data Storage Online / offline monitoring and analysis. Everything needed once the beam is on the target.

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Data Analysis – Team #3

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  1. Data Analysis – Team #3 ROOT as a framework for AGATA O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

  2. What is behind « T3 » ? Data Storage Online / offline monitoring and analysis Everything needed once the beam is on the target O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

  3. Outline What is currently done What should be done Why ROOT can be used Conclusions O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

  4. What is currently done ? Data storageDLT, disk, BLUE, StasbourgDB, Radware AnalysisMIDAS, Radware, paw, others … LanguageFortran, C, C++, MIDAS, Java, others … Is it the best way to work for AGATA ? O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

  5. « Framework approach » User B User A AGATA Soft User C Requirements: Portable / evolutive / well designed Starting from scratch or from an existing framework ? O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

  6. Why ROOT ? From PAW to ROOT … “It became time to re-think our approach to large scale data analysis and simulation and at the same time we had to profit from the progress made in computer science over the past 15 to 20 years. Especially in the area of Object-Oriented design and development. Thus was born ROOT.” http://root.cern.ch O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

  7. Overview • Language C++, Open source • First version in 1997updated version every six months • Large community involved (4 workshops) • Portable on many platformsunix, linux, windows, OS XCC, gcc, icc O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

  8. Libraries of objects for physicists • More than 500 classes already definedex: histograms, functions, graphs, minimization classes… • Many methods (TH1 ~210) HTML documentation O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

  9. ROOT interpreter C/C++ interpreter Ex :root > TF3 f(‘name’,’sin(x*x+y*y+z*z-36)’,-2,2, ,-2,2 ,-2,2)root > f.Eval(1,0,1)root > f.Draw() Complex macros & functions There is a way to compile macros There is a way to extend the root dictionary O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

  10. Object persistence: ROOT files Take into account the object evolution – machine independent Directory like structure Successive updates O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

  11. Many graphical features Windows (canvas/pad) to display any ROOT object • Easy to divide a window • Windows saved in:ROOT file, postscript, svg, gif • Rich GUI • Move, expand, delete • Access to some methods • Way to add new methods O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

  12. Event display The ROOT geometry package is a tool designed for building, browsing, tracking and visualizing a detector geometry. The goal is to be able to use the same geometry for several purposes, such as tracking reconstruction or visualization Concerning the tracking: ROOT does not track itself, it proposes an interface. The real work is done by what is plugged at the running time (GEANT 3 or 4) O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

  13. Others • Interface to the operating system • Generation of random numbers (MC)ex: random number from an histogram • Many ways to fit • Base classes to built new GUI • Thread support • Map files • ….. O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

  14. TTree: special object to store events • Each branch can be splitted • Methods to apply cuts • Treeviewer to display distributions • Mechanism to chain trees O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

  15. Proof and GRID request Master proof ROOT Proof Parallel ROOT Facility out/obj proof 1 proof 2 proof n ROOT is part of the LCG (LHC Computing Grid) projects O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

  16. Data management - What is needed ? How many parallel processes are needed to go through all the data set 40 TB - Data access time 100 MB/sec GRID !! O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

  17. What is done in our field Sofware solutions developed to speed up the gating process BLUE, StrasbourgDB, Radware Radware next generation developed for GRETA • Data ~50 GB + Table ~50 GB • 10 stations running at the same time • GRETA liked simulated events (simple ones) • fold gating ~ 6-7 gated spectrum in seconds !! 50 GB [50 MB/s], reduction by a factor 103 O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

  18. Data management - What is needed ? How many parallel processes are needed to go through all the interesting events 40 TB - Data access time 100 MB/sec GRID ?? O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

  19. Questions to be answered Data storage?Disk (cheap, fast), tapes What structure for the parallel processing? • « Cluster of Universities » for each experiment • AGATA center • GRID Avoid too much data transfert between computers !! • It costs « probably » too much time • It becomes difficult to handle O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

  20. Conclusions ROOT: solid framework for AGATA Specific developments for Nuclear PhysicsOur objects: NuclearLevel, Gamma …Our methods: Gating, DCO, … Any suggestions are welcome !Meeting tomorrow & AGATA-ANALYSIS EX Database (Oracle, MySQL) of level scheme O. Stézowski IPN Lyon AGATA Week 15-19 September 2003 Legnaro

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