On Mon, Jan 08, 2007 at 02:38:50PM +1100, Mark Greenaway wrote:
> Erik de Castro Lopo wrote:
> >Does anyone have any experience profiling Python code? I've done
> >a bit of googling but haven't really found anything.
> >
> Once upon a time, when I was working at CommSecure, we used to do this a
> lot. This part of the library reference should get you started
> http://docs.python.org/lib/profile.html.
> What exactly is the problem? Just want to know where your code spends its
> time?
Note that in Python 2.5 cProfile is probably a better choice (for earlier
versions, google for and install lsprof).
On a related note, a useful tool for ad hoc microbenchmarks is timeit. Invoke
as:
python -m timeit -s "setup" -s "more_setup" "statement to benchmark"
e.g.
$ python -m timeit "x = 34" "x + x"
10000000 loops, best of 3: 0.192 usec per loop
$ python -m timeit "x = 34" "x * 2"
1000000 loops, best of 3: 0.224 usec per loop
$ python -m timeit "x = 34" "x << 1"
1000000 loops, best of 3: 0.219 usec per loop
-Andrew.
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