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turicas/unix_time.py

Created March 30, 2013 22:06
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Python function to retrieve `real`, `sys` and `user` elapsed times, like UNIX command-line `time`.
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unix_time.py
# coding: utf-8
from resource import getrusage as resource_usage, RUSAGE_SELF
from time import time as timestamp
def unix_time(function, args=tuple(), kwargs={}):
'''Return `real`, `sys` and `user` elapsed time, like UNIX's command `time`
You can calculate the amount of used CPU-time used by your
function/callable by summing `user` and `sys`. `real` is just like the wall
clock.
Note that `sys` and `user`'s resolutions are limited by the resolution of
the operating system's software clock (check `man 7 time` for more
details).
'''
start_time, start_resources = timestamp(), resource_usage(RUSAGE_SELF)
function(*args, **kwargs)
end_resources, end_time = resource_usage(RUSAGE_SELF), timestamp()
return {'real': end_time - start_time,
'sys': end_resources.ru_stime - start_resources.ru_stime,
'user': end_resources.ru_utime - start_resources.ru_utime}
if __name__ == '__main__':
def test(iterations):
b = 1
for i in xrange(iterations):
b **= 2
print(unix_time(test, (10, )))
print(unix_time(test, (100, )))
print(unix_time(test, (1000, )))
print(unix_time(test, (10000, )))
print(unix_time(test, (100000, )))
print(unix_time(test, (1000000, )))
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