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Created on 2009-08-11 21:34 by alexandre.vassalotti, last changed 2022-04-11 14:56 by admin. This issue is now closed.
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| File name | Uploaded | Description | Edit | |
| optimize_bytes_from_object.diff | alexandre.vassalotti, 2009-08-11 21:34 | |||
| Messages (3) | |||
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| msg91486 - (view) | Author: Alexandre Vassalotti (alexandre.vassalotti) *  |
Date: 2009-08-11 21:34 | |
Optimize PyBytes_FromObject by adding special-cases for list and tuple objects and by using _PyObject_LengthHint() instead of an arbitrary value for the size of the initial buffer. [Without the patch] ./python -m timeit -s "x = list(range(256))" "bytes(x)" 100000 loops, best of 3: 7.19 usec per loop ./python -m timeit -s "x = tuple(range(256))" "bytes(x)" 100000 loops, best of 3: 7.14 usec per loop ./python -m timeit -s "x = list(range(256))*100" "bytes(x)" 1000 loops, best of 3: 591 usec per loop ./python -m timeit -s "x = range(256)" "bytes(x)" 100000 loops, best of 3: 8.45 usec per loop [With the patch] ./python -m timeit -s "x = list(range(256))" "bytes(x)" 100000 loops, best of 3: 4.43 usec per loop ./python -m timeit -s "x = tuple(range(256))" "bytes(x)" 100000 loops, best of 3: 4.53 usec per loop ./python -m timeit -s "x = list(range(256))*100" "bytes(x)" 1000 loops, best of 3: 335 usec per loop ./python -m timeit -s "x = range(256)" "bytes(x)" 100000 loops, best of 3: 7.56 usec per loop |
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| msg91861 - (view) | Author: Amaury Forgeot d'Arc (amaury.forgeotdarc) * |
Date: 2009-08-22 12:02 | |
Nice improvement! Beware that _PyObject_LengthHint may set an exception, though. |
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| msg97474 - (view) | Author: Alexandre Vassalotti (alexandre.vassalotti) * |
Date: 2010-01-09 22:15 | |
Committed in r77398. |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:56:51 | admin | set | github: 50937 |
| 2010-01-09 22:15:17 | alexandre.vassalotti | set | status: open -> closed resolution: accepted messages: + msg97474 stage: patch review -> resolved |
| 2009-08-22 12:02:10 | amaury.forgeotdarc | set | nosy:
+ amaury.forgeotdarc messages: + msg91861 |
| 2009-08-11 21:34:36 | alexandre.vassalotti | create | |