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CMS performance studies with G4 8.1.p01 General tests

CMS performance studies with G4 8.1.p01 General tests. Maya Stavrianakou, V. Daniel Elvira, Julia Yarba FNAL. CMS migration to G4 8.1.p01 (I). Process “parallel” releases of CMS software (CMSSW) based on G4 7.1 and G4 8.1.p01 several tests for different physics channels

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CMS performance studies with G4 8.1.p01 General tests

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  1. CMS performance studies with G4 8.1.p01General tests Maya Stavrianakou, V. Daniel Elvira, Julia Yarba FNAL LCG Physics Validation Meeting

  2. CMS migration to G4 8.1.p01 (I) Process • “parallel” releases of CMS software (CMSSW) based on G4 7.1 and G4 8.1.p01 • several tests for different physics channels • also several smaller-scale tests, with several types of scans with single particle gun, of the CMS detector or individual subdetectors, with the magnetic field on or off • QGSP versus QGSP_EMV, the latter expected to revert performance to G4 7.1 level both in terms of physics and speed • tests on 3.6 GHz processor, unless stated otherwise • general tests involved full-scale CMS detector geometry addressing only processing time (CPU) • detailed studies of physics performance based on significant statistics and include modeling individual CMS subdetectors (Tracker, Ecal, Hcal, Muon subsystems) exposed to different types of particles LCG Physics Validation Meeting

  3. CMS migration to G4 8.1.p01 (II) Process (cont’d) • standard CMS range cuts: • Beam pipe: 0.01 mm in beryllium, 10 m elsewhere • Tracker: 5 mm in TIB_Ledge, 1 mm in pixel dead regions, 0.1 mm in tracker sensitive, 0.01 mm in pixel sensitive, 10 cm elsewhere • Ecal: 0.1 mm in preshower sensitive, 1 mm elsewhere • Hcal: 1 mm for e's, 10 mm for gamma's • Muon: ranging from 0.002 mm to 10 cm in different regions and for different types of particle • detailed studies of physics performance based on significant statistics and include modeling individual CMS subdetectors (Tracker, Ecal, Hcal, Muon subsystems) exposed to different types of particles • http://cmsdoc.cern.ch/cms/cpt/Software/html/General/simulation/CMSG4Releases.html LCG Physics Validation Meeting

  4. CMS migration to G4 8.1.p01 (III) Tests • minimum bias, Higgs, and Heavy Ion physics events • 50 event statistics for minimum bias and Higgs • 10 events for Heavy Ions • detector scans with different types of single particles • 100 events per test Results • QGSP: slowdown ~30% to ~70% depending on physics channel • QGSP_EMV: speed not only reverts to G4 7.1 levels but appears to improve by ~15-25% LCG Physics Validation Meeting

  5. CMS migration to G4 8.1.p01 (IV) • assume observations for muons apply to general case of MIP's • magnetic field on and off does not seem to induce any significant effects in terms of speed => we do not present separate results • due to low statistics, "indications" rather than "solid conclusions” conclusion • with QGSP_EMV in 8.1.p01, CPU for modeling electromagnetic or hadronic showers reverts to 7.1 level (or close), while simulation of MIP passage through matter appears slightly faster LCG Physics Validation Meeting

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