blob: 64095b3a5d8e4a76d9beb3618f985bb4726cd951 [file] [log] [blame]
Marc-André Lemburg7d9743d2006-06-13 18:56:56 +00001#!/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@egenix.com). See the
6 documentation for further information on copyrights, or contact
7 the author. All Rights Reserved.
8
9"""
10import time
11
12TEST_TIME = 1.0
13
14def 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:
Marc-André Lemburg3b3f1182006-06-13 19:20:07 +000023 break
Marc-André Lemburg7d9743d2006-06-13 18:56:56 +000024 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
35if __name__ == '__main__':
Marc-André Lemburg3b3f1182006-06-13 19:20:07 +000036 print 'Clock resolution of various timer implementations:'
Marc-André Lemburg7d9743d2006-06-13 18:56:56 +000037 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