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#!/usr/bin/env python
import sys
import time
import os
import numpy as np
import detectors
import optics
import generator
from generator import constant
import itertools
import threading
import gpu
from fileio import root
from chroma.itertoolset import repeating_iterator
from tools import profile_if_possible, enable_debug_on_crash
def pick_seed():
'''Returns a seed for a random number generator selected using
a mixture of the current time and the current process ID.'''
return int(time.time()) ^ (os.getpid() << 16)
class Simulation(object):
def __init__(self, detector, detector_material,
seed=None, cuda_device=None, geant4_processes=4, bvh_bits=11,
use_cache=True):
self.detector = detector
if seed is None:
self.seed = pick_seed()
else:
self.seed = seed
print >>sys.stderr, 'RNG seed:', self.seed
# We have three generators to seed: numpy.random, GEANT4, and CURAND.
# The latter two are done below
np.random.seed(self.seed)
self.detector_material = detector_material
if geant4_processes > 0:
self.photon_generator = generator.photon.G4ParallelGenerator(geant4_processes,
detector_material,
base_seed=self.seed)
else:
self.photon_generator = None
print >>sys.stderr, 'Creating BVH with %d bits...' % (bvh_bits)
detector.build(bits=bvh_bits, use_cache=use_cache)
print >>sys.stderr, 'Initializing GPU...'
self.gpu_worker = gpu.GPU(cuda_device)
print >>sys.stderr, 'Loading detector onto GPU...'
self.gpu_worker.load_geometry(detector)
print >>sys.stderr, 'Initializing random numbers generators...'
self.gpu_worker.setup_propagate(seed=self.seed)
self.gpu_worker.setup_daq(max(self.detector.pmtids))
self.pdf_config = None
def simulate(self, nevents, vertex_generator, keep_photon_start=False, keep_photon_stop=False,
run_daq=True, nreps=1):
photon_gen = repeating_iterator(self.photon_generator.generate_events(nevents, vertex_generator),
nreps)
return self.simulate_photons(nevents*nreps,
photon_gen,
keep_photon_start=keep_photon_start, keep_photon_stop=keep_photon_stop,
run_daq=run_daq)
def simulate_photons(self, nevents, photon_generator, keep_photon_start=False, keep_photon_stop=False,
run_daq=True):
for ev in itertools.islice(photon_generator, nevents):
self.gpu_worker.load_photons(ev.photon_start)
self.gpu_worker.propagate()
self.gpu_worker.run_daq()
ev.nphoton = len(ev.photon_start.positions)
if not keep_photon_start:
ev.photon_start = None
if keep_photon_stop:
ev.photon_stop = self.gpu_worker.get_photons()
if run_daq:
ev.hits = self.gpu_worker.get_hits()
ev.channels = ev.hits
yield ev
def propagate_photons(self, photons, max_steps=10):
self.gpu_worker.load_photons(photons)
self.gpu_worker.propagate(max_steps=max_steps)
return self.gpu_worker.get_photons()
def create_pdf(self, nevents, vertex_generator, tbins, trange,
qbins, qrange, nreps=1):
photon_gen = repeating_iterator(self.photon_generator.generate_events(nevents, vertex_generator),
nreps)
return self.create_pdf_from_photons(nevents*nreps, photon_gen,
tbins, trange, qbins, qrange)
def create_pdf_from_photons(self, nevents, photon_generator,
tbins, trange, qbins, qrange):
'''Returns tuple: 1D array of channel hit counts, 3D array of (channel, time, charge) pdfs'''
pdf_config = (tbins, trange, qbins, qrange)
if pdf_config != self.pdf_config:
self.pdf_config = pdf_config
self.gpu_worker.setup_pdf(max(self.detector.pmtids), tbins, trange,
qbins, qrange)
else:
self.gpu_worker.clear_pdf()
for ev in itertools.islice(photon_generator, nevents):
self.gpu_worker.load_photons(ev.photon_start)
self.gpu_worker.propagate()
self.gpu_worker.run_daq()
self.gpu_worker.add_hits_to_pdf()
return self.gpu_worker.get_pdfs()
@profile_if_possible
def main():
import optparse
parser = optparse.OptionParser('%prog filename')
parser.add_option('-b', type='int', dest='nbits', default=11)
parser.add_option('-j', type='int', dest='device', default=None)
parser.add_option('-s', type='int', dest='seed', default=None,
help='Set random number generator seed')
parser.add_option('-g', type='int', dest='ngenerators', default=4,
help='Number of GEANT4 generator processes')
parser.add_option('--detector', type='string', dest='detector', default='microlbne')
parser.add_option('--nevents', type='int', dest='nevents', default=100)
parser.add_option('--particle', type='string', dest='particle', default='e-')
parser.add_option('--energy', type='float', dest='energy', default=100.0)
parser.add_option('--pos', type='string', dest='pos', default='(0,0,0)')
parser.add_option('--dir', type='string', dest='dir', default='(1,0,0)')
parser.add_option('--save-photon-start', action='store_true',
dest='save_photon_start', default=False,
help='Save initial photon vertices to disk')
parser.add_option('--save-photon-stop', action='store_true',
dest='save_photon_stop', default=False,
help='Save final photon vertices to disk')
options, args = parser.parse_args()
if len(args) < 1:
sys.exit(parser.format_help())
else:
output_filename = args[0]
if options.nevents <= 0:
sys.exit('--nevents must be greater than 0!')
position = np.array(eval(options.pos), dtype=float)
direction = np.array(eval(options.dir), dtype=float)
print >>sys.stderr, 'Loading detector %s...' % options.detector
detector = detectors.find(options.detector)
print >>sys.stderr, 'Creating generator...'
if options.particle == 'pi0':
vertex_generator = generator.vertex.pi0_gun(pi0_position=constant(position),
pi0_direction=constant(direction),
pi0_total_energy=constant(options.energy))
else:
vertex_generator = generator.vertex.particle_gun(particle_name=constant(options.particle),
position=constant(position),
direction=constant(direction),
total_energy=constant(options.energy))
# Initializing simulation
print >>sys.stderr, 'WARNING: ASSUMING DETECTOR IS WCSIM WATER!!'
simulation = Simulation(detector=detector, detector_material=optics.water_wcsim,
seed=options.seed, cuda_device=options.device,
geant4_processes=options.ngenerators, bvh_bits=options.nbits)
# Create output file
writer = root.RootWriter(output_filename)
# Preheat generator
event_iterator = simulation.simulate(options.nevents, vertex_generator,
keep_photon_start=options.save_photon_start,
keep_photon_stop=options.save_photon_stop)
print >>sys.stderr, 'Starting simulation...'
start_sim = time.time()
nphotons = 0
for i, ev in enumerate(event_iterator):
assert ev.nphoton > 0, 'GEANT4 generated event with no photons!'
nphotons += ev.nphoton
writer.write_event(ev)
if i % 10 == 0:
print >>sys.stderr, "\rEvent:", i,
end_sim = time.time()
print >>sys.stderr, "\rEvent:", options.nevents - 1
writer.close()
print >>sys.stderr, 'Done. %1.1f events/sec, %1.0f photons/sec.' % (options.nevents/(end_sim - start_sim), nphotons/(end_sim - start_sim))
if __name__ == '__main__':
enable_debug_on_crash()
main()
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