50a4d86961
scripts/python/performance_replay.py
New, script for replaying a recording in Flightgear and gathering
statistics.
scripts/python/recordreplay.py
Minor change.
src/Aircraft/replay.cxx
src/Aircraft/replay.hxx
If /sim/replay/log-frame-times is true, populate
/sim/replay/log-frame-times/dt[] with frame times while replaying.
100 lines
2.5 KiB
Python
Executable file
100 lines
2.5 KiB
Python
Executable file
#!/usr/bin/env python3
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'''
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Replays a Flightgear recording and shows framerate statistics.
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Usage:
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-f <fgfs>
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Name of Flightear executable/script, e.g.: -f run_fgfs.sh
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-i <tape>
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Name of recording, for use with --load-tape.
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'''
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import math
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import sys
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import time
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import recordreplay
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def average_stddev(items):
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'''
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Returns (average, stddev).
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'''
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total = 0
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total_sq = 0
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for item in items:
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total += item
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total_sq += item*item
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n = len(items)
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average = total / n
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variance = total_sq / n - (total / n)**2
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stddev = math.sqrt(variance)
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return average, stddev
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if __name__ == '__main__':
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fgfs = None
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tape = None
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args = iter(sys.argv[1:])
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while 1:
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try:
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arg = next(args)
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except StopIteration:
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break
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if arg in ('-h', '--help'):
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print(__doc__)
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elif arg == '-f':
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fgfs = next(args)
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elif arg == '-i':
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tape = next(args)
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else:
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raise Exception(f'Unrecognised arg: {arg}')
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if not fgfs:
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raise Exception(f'Specify fgfs executable/run-script with -f')
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if not tape:
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raise Exception(f'Specify tape to replay with -i')
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fg = recordreplay.Fg( None,
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f'{fgfs}'
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f' --load-tape={tape}'
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f' --timeofday=noon'
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f' --prop:bool:/sim/replay/log-frame-times=true'
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f' --prop:bool:/sim/replay/looped=false'
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)
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fg.waitfor('/sim/fdm-initialized', 1, timeout=45)
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fg.waitfor('/sim/replay/replay-state', 1)
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fg.waitfor('/sim/replay/replay-state-eof', 1, timeout=600)
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print(f'Reading frame-time statistics...')
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t = time.time()
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items = fg.fg.ls('/sim/replay/log-frame-times')
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t = time.time() - t
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print(f'fg.fg.ls took t={t}')
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fg.close()
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dts = []
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for item in items:
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if item.name == 'dt':
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dts.append(float(item.value))
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def statistics_text(dts):
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dt_average, dt_stddev = average_stddev(dts)
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t_total = sum(dts)
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return f'n={len(dts)} dt_average={dt_average} dt_stddev={dt_stddev} t_total={t_total} fps={len(dts)/t_total}'
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print(f'-' * 40)
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print(f'')
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print(f'Overall frame time (dt) statistics:')
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print(f' {statistics_text(dts)}')
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print(f'Ignoring first 4 frames:')
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print(f' {statistics_text(dts[4:])}')
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print(f'')
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print(f'Raw frame times:')
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dts_text = ' '.join(map(lambda dt: f'{dt:.4f}', dts))
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print(f'dts: {dts_text}')
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