The document summarizes a lightning talk given by Makoto Kuwata on benchmarking and performance testing in Python. It shows the results of several benchmarks comparing the speed of different string operations in Python like addition, formatting, and joining. It demonstrates that the + operator is fastest for short strings while += is fastest for string concatenation. It also discusses using the Benchmarker utility for benchmarking code in Python.

1. PyCon mini JP 2011 Lightning Talk
Benchmarker
a good friend for performance
makoto kuwata
http://www.kuwata-lab.com/

2. Profile
@makotokuwata
http://www.kwuata-lab.com/
Perl is the
Ruby/PHP/Python programmer
CHAMPION!
Creator of Erubis (*)
Python4PHPer
(*) default template engine on Rails 3

3. Question

4. Which is faster?
https://gist.github.com/800384

5. Benchmark
'+' op is the fastest
for short strings
plus op 0.624sec
format 0.887sec
join 0.709sec
0 0.2 0.4 0.6 0.8 1
second per million

6. Which is faster?
https://gist.github.com/801429

7. Benchmark
Not Same!
'+=' op 0.431sec
'=' & '+' 0.439sec
0 0.1 0.2 0.3 0.4 0.5
second per million

8. Which is faster?
https://gist.github.com/801429

9. Benchmark
'+=' op 0.545sec
'=' and '+' Too Slow! Unmeasurable!
0 0.4 0.8 1.2 1.6 2
second per million

10. Why?

11. [OT] Python v.s. Perl

12. [OT] Python v.s. Perl
Perl is
AWESOME!

13. About Benchmarker

14. Benchmarker
Benchmarking utility for Python
A good friend for performance
http://pypi.python.org/pypi/Benchmarker/

15. Example Code

16. Output

17. Remove same fot-stmt

18. Repeat all benchmarks
Remove min & max results

19. Command-line Options

21. thank you