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Created on 2013-10-21 12:01 by serhiy.storchaka, last changed 2022-04-11 14:57 by admin. This issue is now closed.
| Files | ||||
|---|---|---|---|---|
| File name | Uploaded | Description | Edit | |
| re_mk_bitmap.patch | serhiy.storchaka, 2013-10-21 12:01 | review | ||
| re_optimize_charset.patch | serhiy.storchaka, 2013-10-24 19:24 | review | ||
| re_optimize_charset_2.patch | serhiy.storchaka, 2013-10-25 21:02 | review | ||
| Messages (6) | |||
|---|---|---|---|
| msg200755 - (view) | Author: Serhiy Storchaka (serhiy.storchaka) *  |
Date: 2013-10-21 12:01 | |
Here is a patch which speed up compiling of regular expressions with big charsets. Microbenchmark: $ ./python -m timeit "from sre_compile import compile; r = '[%s]' % ''.join(map(chr, range(256, 2**16, 255)))" "compile(r, 0)" Unpatched (but with fixed issue19327): 119 msec per loop Patched: 59.6 msec per loop Compiling regular expressions with big charset was main cause of slowing down importing the email.message module (issue11454). |
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| msg201166 - (view) | Author: Serhiy Storchaka (serhiy.storchaka) * |
Date: 2013-10-24 19:24 | |
Here is a more complex patch which optimizes charset compiling. It affects small charsets too. Big charsets now supports same optimizations as small charsets. Optimized bitmap now can be used even if the charset contains category items or non-bmp characters. $ ./python -m timeit "from sre_compile import compile; r = '[0-9]+'" "compile(r, 0)" Unpatched: 1000 loops, best of 3: 457 usec per loop Patched: 1000 loops, best of 3: 368 usec per loop $ ./python -m timeit "from sre_compile import compile; r = '[ \t\n\r\v\f]+'" "compile(r, 0)" Unpatched: 1000 loops, best of 3: 490 usec per loop Patched: 1000 loops, best of 3: 413 usec per loop $ ./python -m timeit "from sre_compile import compile; r = '[0-9A-Za-z_]+'" "compile(r, 0)" Unpatched: 1000 loops, best of 3: 760 usec per loop Patched: 1000 loops, best of 3: 527 usec per loop $ ./python -m timeit "from sre_compile import compile; r = r'[^\ud800-\udfff]*'" "compile(r, 0)" Unpatched: 100 loops, best of 3: 2.07 msec per loop Patched: 1000 loops, best of 3: 1.44 msec per loop $ ./python -m timeit "from sre_compile import compile; r = '[\u0410-\u042f\u0430-\u043f\u0404\u0406\u0407\u0454\u0456\u0457\u0490\u0491]+'" "compile(r, 0)" Unpatched: 100 loops, best of 3: 8.24 msec per loop Patched: 100 loops, best of 3: 2.13 msec per loop $ ./python -m timeit "from sre_compile import compile; r = '[%s]' % ''.join(map(chr, range(256, 2**16, 255)))" "compile(r, 0)" Unpatched: 10 loops, best of 3: 119 msec per loop Patched: 10 loops, best of 3: 24.1 msec per loop |
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| msg201292 - (view) | Author: Serhiy Storchaka (serhiy.storchaka) * |
Date: 2013-10-25 21:02 | |
Updated patch addresses Antoine's comments. One my bug fixed. |
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| msg201419 - (view) | Author: Roundup Robot (python-dev)  |
Date: 2013-10-27 06:22 | |
New changeset d5498d9d9bb0 by Serhiy Storchaka in branch 'default': Issue #19329: Optimized compiling charsets in regular expressions. http://hg.python.org/cpython/rev/d5498d9d9bb0 |
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| msg201420 - (view) | Author: Serhiy Storchaka (serhiy.storchaka) * |
Date: 2013-10-27 06:24 | |
Thank you Antoine for your review. |
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| msg230335 - (view) | Author: Roundup Robot (python-dev) |
Date: 2014-10-31 11:55 | |
New changeset ebd48b4f650d by Serhiy Storchaka in branch '2.7': Backported the optimization of compiling charsets in regular expressions https://hg.python.org/cpython/rev/ebd48b4f650d |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:57:52 | admin | set | github: 63528 |
| 2014-10-31 11:55:20 | python-dev | set | messages: + msg230335 |
| 2013-10-27 06:24:34 | serhiy.storchaka | set | status: open -> closed resolution: fixed messages: + msg201420 stage: patch review -> resolved |
| 2013-10-27 06:22:02 | python-dev | set | nosy:
+ python-dev messages: + msg201419 |
| 2013-10-25 21:02:01 | serhiy.storchaka | set | files:
+ re_optimize_charset_2.patch messages: + msg201292 |
| 2013-10-24 19:24:58 | serhiy.storchaka | set | files:
+ re_optimize_charset.patch messages: + msg201166 title: Faster compiling of big charset regexpes -> Faster compiling of charset regexpes |
| 2013-10-21 12:01:44 | serhiy.storchaka | set | dependencies: + re doesn't work with big charsets |
| 2013-10-21 12:01:18 | serhiy.storchaka | create | |