Serhiy Storchaka added the comment:
fast_translate.patch works only with ASCII input string and ASCII 1:1 mapping.
Is this actually typical case?
Here is a patch which uses different approach. It caches values for ASCII keys.
It works with all types of input strings and mappings and can speed up more use
cases, including non-ASCII data, deletion and enlarging.
translate_timing.py results:
unpatched patched
Testing 1-1 translation
str.translate 4.55125927699919 0.7898181750006188
str.translate from bytes trans 1.8910855210015143 0.779950579000797
Testing deletion
str.translate 4.481863372000589 0.7718261509999138
Testing enlarging translations
str.translate 4.421521270000085 0.9290620680003485
translate_script_ascii.py results:
---------------------------+---------------------------+-------------------------------
Tests | translate_script_ascii.34 |
translate_script_ascii.cached3
---------------------------+---------------------------+-------------------------------
replace none, length=10 | 6.12 us (+176%) |
2.22 us (*)
replace none, length=10**3 | 448 us (+1293%) |
32.2 us (*)
replace none, length=10**6 | 474 ms (+1435%) |
30.9 ms (*)
replace 10%, length=10 | 5.73 us (+133%) |
2.46 us (*)
replace 10%, length=10**3 | 412 us (+1060%) |
35.5 us (*)
replace 10%, length=10**6 | 442 ms (+1204%) |
33.9 ms (*)
replace 50%, length=10 | 4.75 us (+85%) |
2.57 us (*)
replace 50%, length=10**3 | 311 us (+552%) |
47.7 us (*)
replace 50%, length=10**6 | 331 ms (+617%) |
46.2 ms (*)
replace 90%, length=10 | 3.36 us (+29%) |
2.59 us (*)
replace 90%, length=10**3 | 178 us (+250%) |
50.8 us (*)
replace 90%, length=10**6 | 192 ms (+291%) |
49.2 ms (*)
replace all, length=10 | 2.64 us (+28%) |
2.06 us (*)
replace all, length=10**3 | 146 us (+189%) |
50.3 us (*)
replace all, length=10**6 | 152 ms (+194%) |
51.7 ms (*)
---------------------------+---------------------------+-------------------------------
Total | 1.59 sec (+651%) |
212 ms (*)
---------------------------+---------------------------+-------------------------------
----------
Added file: http://bugs.python.org/file34734/translate_cached.patch
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<http://bugs.python.org/issue21118>
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