| #!/usr/bin/env python |
| |
| """ clockres - calculates the resolution in seconds of a given timer. |
| |
| Copyright (c) 2006, Marc-Andre Lemburg (mal@egenix.com). 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 |