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DZero Monte Carlo

DZero Monte Carlo. Status, Performance, and Future Plans. Greg Graham U. Maryland - Dzero 10/16/2000. ACAT 2000. DZero Monte Carlo Components. GEANT-3 based hits simulation (D0gstar) Separate executable for digitization and pileup (D0Sim) Parameterized Monte Carlo Simulation (PMCS)

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DZero Monte Carlo

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  1. DZero Monte Carlo Status, Performance, and Future Plans Greg Graham U. Maryland - Dzero 10/16/2000 ACAT 2000

  2. DZero Monte Carlo Components • GEANT-3 based hits simulation (D0gstar) • Separate executable for digitization and pileup (D0Sim) • Parameterized Monte Carlo Simulation (PMCS) • Infrastructure for MC generation (MCC) • Trigger Simulator/Emulator (Trigsim) • D0 Reconstruction Program (D0Reco) • Won’t talk about here ... Greg Graham - ACAT 2000

  3. Aside on DZero Code • Dzero executables consist of packages running in a framework • Packages inherit hook methods • Framework calls hook methods of packages in well defined order • Dynamic : Requirements Based • Static : User defined order given at runtime • Runtime parameters handled by RCP database system (M. Paterno) • RCP script files tied to code releases in CVS • Events are tagged with RCP ID’s Greg Graham - ACAT 2000

  4. Aside on DZero Object Model (D0OM) • Persistency mechanism D0OM • “loosely” based on ODMG standards • Supports CERN DSPACK as well as EVPACK I/O packages • EVPACK can attain factor of 2 compression over DSPACK Greg Graham - ACAT 2000

  5. Generators • Pythia v6.129 • Upgrade soon to at least 6.134 • Isajet v7.44 • Herwig v6.1 • Special Purpose • Single Particle • Cosmic Ray • etc. Greg Graham - ACAT 2000

  6. GEANT-3 Based Monte Carlo (D0gstar) • GEANT 3.21 • C++ wrappers around Fortran code • Almost complete model of the DZero detector • FPD to be included when double precision GEANT-3 is integrated • Small detectors (i.e.- luminosity monitor) to be included soon Greg Graham - ACAT 2000

  7. Digitization Program (D0Sim) • Includes packages to digitize hits in all detector systems in D0Gstar • pileup package • Simulates pileup in all detector systems • Poisson or Constant sampling of Min Bias events • Simulates effects of noise in calorimeter and the baseline subtracting electronics Greg Graham - ACAT 2000

  8. Performance D0gstar/D0Sim • Event Size (Pythia ttbar events) • D0gstar : 0.9 MB/ev • D0Sim : 1.0 MB/ev • Event Time (200 MHz - Origin 2000) • D0gstar : 110 sec/evt (pmc03.00.01) • D0Sim : 80 sec/evt (psim01.01.00) • These are still rough numbers while the issues of optimization and output are being resolved. Greg Graham - ACAT 2000

  9. Parameterized Monte Carlo (PMCS) • Packages divided into three categories • FAST Track : High level physics objects • Charged Particles, EM particles, Jets, Muons, Tau, Vertices • Medium Track : Quick simulation of some detectors • Calorimeter, silicon • Slow Track : Detailed simulation of some detectors • Calorimeter, silicon in more detail; showers Greg Graham - ACAT 2000

  10. Parameterized Monte Carlo (PMCS) • The fast track has the highest priority. • Chunk output makes PMCS compatible with other D0 tools • Visualization, Analyze on Fast Track objects • Some D0Reco packages with Medium, Slow • Small packages facilitate the contribution of many towards PMCS • Maryland, Rochester, IN2P3 Lyon, TIFR Greg Graham - ACAT 2000

  11. Parameterized Monte Carlo (PMCS) Package based flexible output choices D0 Chunks Ntuples HBOOK or ROOT ROOT Tree Greg Graham - ACAT 2000

  12. Parameterized Monte Carlo (PMCS) • Performance (Pythia ttbar events, 200 MHz Origin 2000 machine) • 22 events/sec • Can do simple things well for now; but need muon package and vertices Greg Graham - ACAT 2000

  13. Dzero Monte Carlo Challenge • Phase II : • Ended April 2000 • Generated over 1 million events • Worldwide Effort • Phase III : • In progress • Over 600K events so far processed by D0GSTAR Greg Graham - ACAT 2000

  14. Running Dzero Offline Executables • Help for managing the MCC ... • mc_runjob : A package written in Python • Runs most D0 Offline Executables • All of them in principle • Chains executables together • Handles naming of input and output files • Handles seed generation, run numbers, etc. • Macro Script driven => Regular way to specify processing steps ! Greg Graham - ACAT 2000

  15. Mc_runjob “Configurators” Run and configure each D0 Offline executable The “Linker” Links Configurators Collects shell scripts that actually do the work Macro scripts The Linker and Configurators obey a regular set of macro commands in macro scripts Greg Graham - ACAT 2000

  16. Inheritance Hierarchy Inheritance is used to incorporate D0 specific configuration (ie - RCP, runtime environment, naming, SAM metadata) Other special purpose configurators can handle the batch system, manage a list of files, etc. Greg Graham - ACAT 2000

  17. Graphical Support While primarily a macro script driven tool, the mc_runjob inheritance hierarchy also provides core tools with GUI methods that build a GUI from information contained in the configurators themselves. Greg Graham - ACAT 2000

  18. Automatic Processing Request Handling System • In MCC-II; Much of the work of generating events and keeping track was done by hand. • In MCC-III; it still is, however … • Automatic processing tools are nearing completion • Tracking in Oracle DB • Tools to generate events, specify processing • Tools to store/transport output Greg Graham - ACAT 2000

  19. Automatic Request Processing System Greg Graham - ACAT 2000

  20. Physics Process Specification Schema part of SAM system Greg Graham - ACAT 2000

  21. Automatic Request Processing Schema Schema part of SAM system Greg Graham - ACAT 2000

  22. Remote Processing Centers • Monte Carlo simulation, digitization, and eventually some MC reconstruction will be handled offsite. • Currently operating RPCs • UT Arlington; IN2P3, Lyon; NIKHEF, Amsterdam; Prague • Future planned RPCs • Lancaster; Rio de Janeiro; TIFR • Generated events will be stored with SAM • We expect better than 100K events/day Greg Graham - ACAT 2000

  23. Trigsim • A trigger emulator/simulator • Code run in trigsim will be the same code that runs in the actual trigger processors where applicable; including the L1 firmware • Many packages • 1 package for each L1/L2 trigger subsystem • Dynamic framework • The processing order depends upon the input requirements of each package - the framework sorts it out Greg Graham - ACAT 2000

  24. Trigsim Status • Production release Deadline : Nov 1, 2000 • Currently in development releases : • L1/L2 cal, L1/L2 Muon, L1 FT, L2 STT • Framework for running tsim Greg Graham - ACAT 2000

  25. Future Plans • Complete all functionality of D0gstar, D0Sim • Of course, this never really ends … • Optimize speed and size of output • Complete functionality of PMCS • No production release planned yet • Make the trigsim production release deadline • Test the automatic processing system on the D0 Farm system and put into production • Will happen this week (I hope…) Greg Graham - ACAT 2000

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