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Meeting 2016 12 16

Simulation statistics (GQLink)

N02 (100m, 200 planes, helicoidal movement, no physics) CMS (32 events w/particle gun, 10 GeV pi-, full geometry, epsMin = dQRel = 1e-5) Idem CMS (but w/default accuracy parameters)
Simulation time 3.75 seconds (3% faster than G4) 36.4 seconds (29.35 seconds in G4; 24% slower) 38.1 seconds (29.75 seconds in G4; 28% slower)
Geant4 steps 144013 456330 495732
Steps w/safety=0 144013 (100%) 307243 (67.33%) 326192 (65.80%)
Steps w/safety!=0 0 (0%) 149087 (32.67%) 169540 (34.20%)
QSS substeps 427295 (avg: 2.97 per G4 step) 1649858 (avg: 3.62 per G4 step) 1838140 (avg: 3.71 per G4 step)
Volume crossings 144012 (~100%) 33507 (7.34%) 42858 (8.65%)
Reinits Intentionally disabled 184796 (40.50%) 215362 (43.44%)
EstimateIntersectionPoint (CPU usage) 16.51% (7.59% if reinits enabled) 0.24%
GQLink_reinit (CPU usage) 1.79% (12.4% if reinits enabled) 5.55%
Full callgraph Link
Link
  • Analogous figures for Geant4 showed consistent results (i.e., similar number of steps, zero/nonzero safety values and volume crossings).

Additional statistics

Idem CMS (32 events, but shooting 10 GeV mu-)
Simulation time 5.48 seconds (2.95 seconds in G4; 87% slower)
Geant4 steps 134257
Steps w/safety=0 83182 (61.96%)
Steps w/safety!=0 51075 (38.04%)
QSS substeps 526631 (avg: 3.92 per G4 step)
Volume crossings 25260 (18.81%)
Reinits 76735 (57.16%)
EstimateIntersectionPoint (CPU usage) 0.96%
GQLink_reinit (CPU usage) 13.13%
Full callgraph Link
Idem CMS (2000 events, 10 GeV pi-) Idem CMS (20000 events, 10 GeV mu-)
Simulation time 2109.13 seconds (1551.76 seconds in G4; 36% slower) 3129.69 seconds (1927.18 seconds in G4; 62% slower)
Geant4 steps 29234603 82452988
Steps w/safety=0 19414230 (66.41%) 50616536 (61.39%)
Steps w/safety!=0 9820373 (33.59%) 31836452 (38.61%)
QSS substeps 106999742 (avg: 3.66 per G4 step) 325124202 (avg: 3.94 per G4 step)
Volume crossings 2482502 (8.49%) 15700711 (19.04%)
Reinits 12459358 (42.62%) 47799184 (57.97%)
Idem CMS (1 Pythia event) Idem CMS (50 Pythia events)
Simulation time 437.5 seconds (296.98 seconds in G4; 47% slower) 24778.29 seconds (16130.66 seconds in G4; 53% slower)
Geant4 steps 9223542 532220518
Steps w/safety=0 6187580 (67.08%) 346687669 (65.14%)
Steps w/safety!=0 3035962 (32.92%) 185532849 (34.86%)
QSS substeps 35095617 (avg: 3.81 per G4 step) 2031751030 (avg: 3.82 per G4 step)
Volume crossings 307547 (3.33%) 21309892 (4.00%)
Reinits 3349181 (36.31%) 207046672 (38.90%)
Idem CMS (10 events, FTFP_BERT_HP physics, 10 GeV pi-)
Simulation time 115.21 seconds (115.99 seconds in G4; 0.6% faster)
Geant4 steps 229052
Steps w/safety=0 171618 (74.93%)
Steps w/safety!=0 57434 (25.07%)
QSS substeps 723610 (avg: 3.16 per G4 step)
Volume crossings 12465 (5.44%)
Reinits 70691 (30.86%)
Idem CMS (2000 events, FTFP_BERT_HP physics, 10 GeV pi-)
Simulation time 22376.18 seconds (21746.55 seconds in G4; 2.8% slower)
Geant4 steps 46765610
Steps w/safety=0 34748706 (74.30%)
Steps w/safety!=0 12016904 (25.70%)
QSS substeps 149170001 (avg: 3.19 per G4 step)
Volume crossings 2685374 (5.74%)
Reinits 14881595 (31.82%)

Simulation time comparison - N02 with and without reinits