Antoine Pitrou added the comment:
Here is a simple benchmark (Linux, gcc 4.7.3):
$ ./python -m timeit -s "words=[w for line in open('LICENSE') for w in
line.split()]; import collections" "c = collections.Counter(words);
c.most_common(10)"
- 64-bit build, before: 313 usec per loop
- 64-bit build, after: 298 usec per loop
- 32-bit build, before: 328 usec per loop
- 32-bit build, before: 329 usec per loop
- x32 build, before: 291 usec per loop
- x32 build, after: 284 usec per loop
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<http://bugs.python.org/issue19183>
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