1 #!/usr/bin/env python 2 3 """ clockres - calculates the resolution in seconds of a given timer. 4 5 Copyright (c) 2006, Marc-Andre Lemburg (mal (at] egenix.com). See the 6 documentation for further information on copyrights, or contact 7 the author. All Rights Reserved. 8 9 """ 10 import time 11 12 TEST_TIME = 1.0 13 14 def clockres(timer): 15 d = {} 16 wallclock = time.time 17 start = wallclock() 18 stop = wallclock() + TEST_TIME 19 spin_loops = range(1000) 20 while 1: 21 now = wallclock() 22 if now >= stop: 23 break 24 for i in spin_loops: 25 d[timer()] = 1 26 values = d.keys() 27 values.sort() 28 min_diff = TEST_TIME 29 for i in range(len(values) - 1): 30 diff = values[i+1] - values[i] 31 if diff < min_diff: 32 min_diff = diff 33 return min_diff 34 35 if __name__ == '__main__': 36 print 'Clock resolution of various timer implementations:' 37 print 'time.clock: %10.3fus' % (clockres(time.clock) * 1e6) 38 print 'time.time: %10.3fus' % (clockres(time.time) * 1e6) 39 try: 40 import systimes 41 print 'systimes.processtime: %10.3fus' % (clockres(systimes.processtime) * 1e6) 42 except ImportError: 43 pass 44
