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@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