GEANT4 performance studies

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Presentation transcript:

GEANT4 performance studies Pedro Arce (CERN/CIEMAT) GEANT4 Workshop 02 GEANT4 preformance studies Pedro Arce (CERN/CIEMAT)

GEANT4 preformance studies Pedro Arce (CERN/CIEMAT) Outline GEANT3 vs GEANT4 performance for full events Where time is spent Tracking speed Tuning GEANT4 tracking in field parameters GEANT4 Workshop 02 GEANT4 preformance studies Pedro Arce (CERN/CIEMAT)

GEANT4 vs GEANT3 Time Performance - Full events in full CMS: H / tte / Z - Cuts in primary particles: Pt : 1 GeV, || < 2.4 (3.0) - Full CMS geometry - 3D TOSCA magnetic field - Production and tracking cuts as in CMSIM (GEANT3) - GEANT4 voxel navigation - GEANT44.4.0.ref02 - Pentium III 850 Mhz - Checked that they are really the same events (see next) GEANT4 Workshop 02 GEANT4 preformance studies Pedro Arce (CERN/CIEMAT)

GEANT4 preformance studies Pedro Arce (CERN/CIEMAT) G3-G4 events detailed comparison H in all CMS (10 Events) Initial track energy No Tracks MeV Track length No Tracks mm GEANT4 Workshop 02 GEANT4 preformance studies Pedro Arce (CERN/CIEMAT)

GEANT4 preformance studies Pedro Arce (CERN/CIEMAT) G3-G4 events: detailed comparison Origin of secondary tracks: R vs Z R (mm) CMSIM (442828 tracks) Z (mm) R (mm) OSCAR (427136 tracks) Z (mm) GEANT4 Workshop 02 GEANT4 preformance studies Pedro Arce (CERN/CIEMAT)

GEANT4 preformance studies Pedro Arce (CERN/CIEMAT) Time performance - H (10 events) CMSIM: 439k tracks 64 sec/evt OSCAR: 400k tracks 117 sec/evt (1.83) - tte (10 events) CMSIM: 1809k tracks 184 sec/evt OSCAR: 1159k tracks 425 sec/evt (2.31) - Z (10 events) CMSIM: 1105k tracks 96 sec/evt OSCAR: 941k tracks 248 sec/evt (2.58) GEANT4 Workshop 02 GEANT4 preformance studies Pedro Arce (CERN/CIEMAT)

GEANT4 preformance studies Pedro Arce (CERN/CIEMAT) Where time is spent? Profile (´gprof´)10 full pp events in full CMS (GEANT4.3.2.ref02) (numbers are accumulated: spent in the method itself or those invoked) 100% main 1,8% G4RunManager::RunInitialization 0.8% G4SteppingManager::SetInitialStep 0.3% G4ProcessManager::EndTracking 0.2% G4ProcessManager::StartTracking 95,7% G4TrackingManager::ProcessOneTrack 95,7% G4SteppingManager::Stepping 41% G4SteppingManager::DefinePhysicalStepLength 22% G4VProcess::AlongStepGPIL 17% G4VProcess::PostStepGPIL 26% G4SteppingManager::InvokeAlongStepDoItProcs 20% G4SteppingManager::InvokePostStepDoItProcs GEANT4 Workshop 02 GEANT4 preformance studies Pedro Arce (CERN/CIEMAT)

GEANT4 preformance studies Pedro Arce (CERN/CIEMAT) Where time is spent? 41% G4SteppingManager::DefinePhysicalStepLength 22% G4VProcess::AlongStepGPIL 18% G4Transportation::AlongStepGetPhysicalInteractionLength 4% G4MultipleScattering::AlongStepGetPhysicalInteractionLength 17% G4VProcess::PostStepGPIL 14% G4VContinuousDiscreteProcess::PostStepGetPhysicalInterac-tionLength 1% G4VDiscreteProcess::PostStepGetPhysicalInteractionLength 1% G4VRestDiscreteProcess::PostStepGetPhysicalInteraction-Length GEANT4 Workshop 02 GEANT4 preformance studies Pedro Arce (CERN/CIEMAT)

GEANT4 preformance studies Pedro Arce (CERN/CIEMAT) Where time is spent? 26% G4SteppingManager::InvokeAlongStepDoItProcs 5% G4ParticleChangeForTransport::UpdateStepForAlongStep 5% G4ParticleChange::UpdateStepForAlongStep 3% G4VeEnergyLoss::AlongStepDoIt 3% G4Transportation::AlongStepDoIt 1% G4MultipleScattering::AlongStepDoIt 1% G4VhEnergyLoss::AlongStepDoIt 20% G4SteppingManager::InvokePostStepDoItProcs 5% G4MultipleScattering::PostStepDoIt 4% G4Step::UpdateTrack 4% G4Transportation::PostStepDoIt 2% G4ParticleChangeForMSC::UpdateStepForPostStep GEANT4 Workshop 02 GEANT4 preformance studies Pedro Arce (CERN/CIEMAT)

GEANT4 preformance studies Pedro Arce (CERN/CIEMAT) Where time is spent? 25% TRANSPORTATION: 18% G4Transportation::AlongStepGetPhysicalInteractionLength 14% G4PropagatorInField::ComputeStep 8% G4ChordFinder::AdvanceChordLimited 3% G4Transportation::AlongStepDoIt 4% G4Transportation::PostStepDoIt 4.2% LOCATE IN GEOMETRY TREE 1.0% G4PropagatorInField::LocateIntersectionPoint 0.8% G4Navigator::LocateGlobalPointWithinVolume 1.5% G4Navigator::LocateGlobalPointAndUpdateTouchableHandle 1.0% G4Navigator::LocateGlobalPointAndSetup GEANT4 Workshop 02 GEANT4 preformance studies Pedro Arce (CERN/CIEMAT)

GEANT4 preformance studies Pedro Arce (CERN/CIEMAT) Tracking speed: G3 vs G4 Track charged geantinos in CMS (muon w/o physics as there are no charged geantinos in GEANT3) 1000 tracks at random eta and phi Magnetic field OFF GEANT4 magnetic field is more precise... ... Can we make it less precise and get as fast as GEANT3? ... Or maybe GEANT3 is too unprecise for our needs? Magnetic field ON GEANT3 GEANT4 P=10000 GeV 13.7s 12.62s P=50 GeV P=5 GeV 12.57s GEANT3 GEANT4 P=10000 GeV 24.7s 88.2s P=50 GeV 26.0s 131.2s P=5 GeV 28.2s 174.3s GEANT4 Workshop 02 GEANT4 preformance studies Pedro Arce (CERN/CIEMAT)

Tracking in field parameters GEANT4 gives you a big freedom to optimise magnetic field tracking. User can select: IntegratorStepper class G4FieldManager::SetDeltaChord(value) G4FieldManager::SetDeltaOneStep(value) G4FieldManager::SetDeltaIntersection(value) G4PropagatorInField::SetMinimumEpsilonStep(value) G4PropagatorInField()::SetMaximumEpsilonStep(value) G4IntegrationDriver()->SetHmin( value ) Select a default and Change systematically one parameter each time 1000 tracks of 50 GeV (same effects observed for 5 Gev & 10000 GeV) Integrator Stepper delta Chord delta OneStep delta Intersection minEpsilon maxEpsilon driverHmin G4ClassicalRK4 0.1 mm 0.25 mm 0.001 mm 1.E-5 0.05 0.01 GEANT4 Workshop 02 GEANT4 preformance studies Pedro Arce (CERN/CIEMAT)

Tracking in field parameters deltaChord (mm): deltaOneStep (mm): deltaIntersection (mm): minEpsilon 1.E-5 1.E-4 1.E-3 1.E-2 0.1 1. 10. 281.2 151.7 131.2 164.7 320.8 641.6 1710.9 0.001 0.01 0.1 0.25 1. 10. 100. 321.1 321.4 320.8 321.0 316.5 170.8 0.001 0.01 0.1 1. 10. 320.8 306.5 293.7 294.7 295.3 1.E-3 1E-4 1E-5 1E-6 1E-7 134.7 172.7 320.8 630.9 799.9 GEANT4 Workshop 02 GEANT4 preformance studies Pedro Arce (CERN/CIEMAT)

Tracking in field parameters maxEpsilon: driverHmin: Select some good parameters: and change integrator stepper: 1. 1E-1 0.05 1E-2 1E-3 1E-4 321.2 320.8 321.5 321.1 320.4 0.0001 0.001 0.01 0.1 1. 10. 295.5 295.6 296.4 296.1 291.8 delta Chord delta OneStep delta Intersection minEpsilon maxEpsilon driverHmin 0.01 mm 0.25 mm 0.001 mm 1.E-4 0.05 0.1 ClassicalRK4 CashKarpRKF45 HelixExplicitEuler HelixImplicitEuler HelixSimpleRunge SimpleHeum SimpleRunge 125.2 110.9 55.2 92.4 57.9 99.0 72.0 GEANT4 Workshop 02 GEANT4 preformance studies Pedro Arce (CERN/CIEMAT)

Tracking in field parameters Push it to the limit (although not clear how much the optimal value of a parameter depends on others): We can play with the parameters, but first we have to understand How much we can change the parameters without affecting the physics results? What are ´good physics results´ (is GEANT3 precision enough?) Long way to go... Integrator Stepper delta Chord delta OneStep delta Intersection minEpsilon maxEpsilon driverHmin HelixExplicitEuler 0.001 mm 100. mm 1.E-3 0.05 0.01 GEANT3 GEANT4 GEANT4 (opti?) P=10000 GeV 24.7s 88.2s 41.5s P=50 GeV 26.0s 131.2s 48.9s P=5 GeV 28.2s 174.3s 65.2s GEANT4 Workshop 02 GEANT4 preformance studies Pedro Arce (CERN/CIEMAT)