ref: b7105fe0662b57689f629ac768dd084f8a1589a4
dir: /sys/src/cmd/python/Tools/pybench/clockres.py/
#!/usr/bin/env python
""" clockres - calculates the resolution in seconds of a given timer.
Copyright (c) 2006, Marc-Andre Lemburg ([email protected]). See the
documentation for further information on copyrights, or contact
the author. All Rights Reserved.
"""
import time
TEST_TIME = 1.0
def clockres(timer):
d = {}
wallclock = time.time
start = wallclock()
stop = wallclock() + TEST_TIME
spin_loops = range(1000)
while 1:
now = wallclock()
if now >= stop:
break
for i in spin_loops:
d[timer()] = 1
values = d.keys()
values.sort()
min_diff = TEST_TIME
for i in range(len(values) - 1):
diff = values[i+1] - values[i]
if diff < min_diff:
min_diff = diff
return min_diff
if __name__ == '__main__':
print 'Clock resolution of various timer implementations:'
print 'time.clock: %10.3fus' % (clockres(time.clock) * 1e6)
print 'time.time: %10.3fus' % (clockres(time.time) * 1e6)
try:
import systimes
print 'systimes.processtime: %10.3fus' % (clockres(systimes.processtime) * 1e6)
except ImportError:
pass