bench_filter.py

from benchmarker import Benchmarker
from itertools import ifilter

f = lambda x: x % 2

with Benchmarker(width=40, loop=1000) as bm:
    for _ in bm('filter'):
        list(filter(f, xrange(10000)))
    for _ in bm('ifilter'):
        list(ifilter(f, xrange(10000)))
    for _ in bm('list comp'):
        [x for x in xrange(10000) if f(x)]
    for _ in bm('generator exp'):
        list((x for x in xrange(10000) if f(x)))

"""
## benchmarker:       release 3.0.1 (for python)
## python platform:   linux2 [GCC 4.6.3]
## python version:    2.7.3

##                                           user       sys     total      real
filter                                     1.0200    0.0000    1.0200    1.0633
ifilter                                    1.3800    0.0100    1.3900    1.4401
list comp                                  1.6700    0.0100    1.6800    1.7635
generator exp                              1.2800    0.0100    1.2900    1.3989

## Ranking                                   real
filter                                     1.0633 (100.0%) *************************
generator exp                              1.3989 ( 76.0%) *******************
ifilter                                    1.4401 ( 73.8%) ******************
list comp                                  1.7635 ( 60.3%) ***************

## Ratio Matrix                              real    [01]    [02]    [03]    [04]
[01] filter                                1.0633  100.0%  131.6%  135.4%  165.9%
[02] generator exp                         1.3989   76.0%  100.0%  103.0%  126.1%
[03] ifilter                               1.4401   73.8%   97.1%  100.0%  122.5%
[04] list comp                             1.7635   60.3%   79.3%   81.7%  100.0%
"""

"""
## benchmarker:       release 3.0.1 (for python)
## python platform:   linux2 [PyPy 2.5.1 with GCC 4.6.3]
## python version:    2.7.9
## python executable: /home/nn/pypy/bin/python

##                                           user       sys     total      real
filter                                     0.2100    0.0000    0.2100    0.4034
ifilter                                    2.3800    0.0200    2.4000    2.4312
list comp                                  0.2500    0.0000    0.2500    0.2558
generator exp                              0.4900    0.0000    0.4900    0.4964

## Ranking                                   real
list comp                                  0.2558 (100.0%) *************************
filter                                     0.4034 ( 63.4%) ****************
generator exp                              0.4964 ( 51.5%) *************
ifilter                                    2.4312 ( 10.5%) ***

## Ratio Matrix                              real    [01]    [02]    [03]    [04]
[01] list comp                             0.2558  100.0%  157.7%  194.1%  950.6%
[02] filter                                0.4034   63.4%  100.0%  123.0%  602.6%
[03] generator exp                         0.4964   51.5%   81.3%  100.0%  489.8%
[04] ifilter                               2.4312   10.5%   16.6%   20.4%  100.0%
"""