Re: How to measure execution time of a program

[Fredrik Lundh]

Can anyone tell me the simplest way to do it (some code snippet that
could be included in the program's main function) ??

simplest way:

t0 = time.time()
main()
print time.time() - t0, "seconds"

(assuming that you want to measure wall time, and that your program runs
for at least a tenth of second, or so. for benchmarking of short code snippets,
see the "timeit" module)

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[Pete Forman]

> simplest way:
>
> t0 = time.time()

You can get better resolution by using time.clock() instead of
time.time().
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[Fredrik Lundh]

You can get better resolution by using time.clock() instead of
time.time().

depends on the platform, and whether you want wall time or process time.

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[Grant Edwards]

You can get better resolution by using time.clock() instead of
time.time().

Oh really? When I do it, time.clock() is worse:

------------------------------timeit.py------------------------------
import time

for i in range(5):
t0 = time.time()
print "hi there"
print time.time()-t0

for i in range(5):
t0 = time.clock()
print "hi there"
print time.clock()-t0
------------------------------timeit.py------------------------------

hi there
0.000149011611938
hi there
4.10079956055e-05
hi there
3.981590271e-05
hi there
3.981590271e-05
hi there
3.88622283936e-05
hi there
0.0
hi there
0.0
hi there
0.0
hi there
0.0
hi there
0.0

 

[Fredrik Lundh]

Oh really? When I do it, time.clock() is worse:

on Unix, time.clock() is a tick counter; if your process is running when the tick
interrupt arrives, the internal counter value is incremented (whether the process
actually used the full tick slot or not). the tick resolution is usually 1-10 milli-
seconds.

on Windows, time.clock() is a high-resolution CPU counter, with microsecond
resolution.

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