STINNER Victor added the comment:
Benchmark results. Sorry for the very long output.
There are some (corner?) cases where the patched Python is a little bit slower.
I consider that it's ok since it's *much* faster in the other cases.
What do you think?
Common platform:
Timer info: namespace(adjustable=False,
implementation='clock_gettime(CLOCK_MONOTONIC)', monotonic=True,
resolution=1e-09)
Bits: int=32, long=64, long long=64, size_t=64, void*=64
CPU model: Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz
Python unicode implementation: PEP 393
Timer: time.perf_counter
SCM: hg revision=10efb1797e7b+ tag=tip branch=default date="2015-10-01 13:16
+0200"
Platform: Linux-4.1.6-200.fc22.x86_64-x86_64-with-fedora-22-Twenty_Two
CFLAGS: -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g
-fwrapv -O3 -Wall -Wstrict-prototypes
Platform of campaign before:
Date: 2015-10-01 13:30:07
Timer precision: 61 ns
Python version: 3.6.0a0 (default:10efb1797e7b, Oct 1 2015, 13:30:06) [GCC 5.1.1
20150618 (Red Hat 5.1.1-4)]
Platform of campaign after:
Timer precision: 63 ns
Date: 2015-10-01 13:54:14
Python version: 3.6.0a0 (default:10efb1797e7b+, Oct 1 2015, 13:53:51) [GCC
5.1.1 20150618 (Red Hat 5.1.1-4)]
--------------------------+-------------+----------------
ignore: "\udcff" * length | before | after
--------------------------+-------------+----------------
length=10**1 | 3.16 us (*) | 279 ns (-91%)
length=10**3 | 241 us (*) | 1.08 us (-100%)
length=10**2 | 23.9 us (*) | 346 ns (-99%)
length=10**4 | 2.39 ms (*) | 6.48 us (-100%)
--------------------------+-------------+----------------
Total | 2.66 ms (*) | 8.19 us (-100%)
--------------------------+-------------+----------------
--------------------------------+-------------+---------------
ignore: "a" * length + "\udcff" | before | after
--------------------------------+-------------+---------------
length=10**1 | 1.12 us (*) | 295 ns (-74%)
length=10**3 | 2.2 us (*) | 1.57 us (-29%)
length=10**2 | 1.21 us (*) | 408 ns (-66%)
length=10**4 | 10.4 us (*) | 12.3 us (+18%)
--------------------------------+-------------+---------------
Total | 15 us (*) | 14.6 us
--------------------------------+-------------+---------------
--------------------------------------------+-------------+---------------
ignore: ("a" * 99 + "\udcff" * 99) * length | before | after
--------------------------------------------+-------------+---------------
length=10**1 | 238 us (*) | 2.46 us (-99%)
length=10**3 | 23.7 ms (*) | 234 us (-99%)
length=10**2 | 2.38 ms (*) | 20.8 us (-99%)
length=10**4 | 238 ms (*) | 2.56 ms (-99%)
--------------------------------------------+-------------+---------------
Total | 265 ms (*) | 2.82 ms (-99%)
--------------------------------------------+-------------+---------------
---------------------------------------+-------------+----------------
ignore: ("\udcff" * 99 + "a") * length | before | after
---------------------------------------+-------------+----------------
length=10**1 | 239 us (*) | 1.29 us (-99%)
length=10**3 | 23.8 ms (*) | 80.9 us (-100%)
length=10**2 | 2.4 ms (*) | 8.44 us (-100%)
length=10**4 | 236 ms (*) | 839 us (-100%)
---------------------------------------+-------------+----------------
Total | 263 ms (*) | 930 us (-100%)
---------------------------------------+-------------+----------------
--------------------------------+-------------+---------------
ignore: "\udcff" + "a" * length | before | after
--------------------------------+-------------+---------------
length=10**1 | 1.09 us (*) | 297 ns (-73%)
length=10**3 | 2.19 us (*) | 1.58 us (-28%)
length=10**2 | 1.19 us (*) | 409 ns (-66%)
length=10**4 | 10.5 us (*) | 12.3 us (+17%)
--------------------------------+-------------+---------------
Total | 14.9 us (*) | 14.6 us
--------------------------------+-------------+---------------
---------------------------+-------------+----------------
replace: "\udcff" * length | before | after
---------------------------+-------------+----------------
length=10**1 | 3.47 us (*) | 317 ns (-91%)
length=10**3 | 263 us (*) | 1.07 us (-100%)
length=10**2 | 26.4 us (*) | 383 ns (-99%)
length=10**4 | 2.65 ms (*) | 6.75 us (-100%)
---------------------------+-------------+----------------
Total | 2.94 ms (*) | 8.52 us (-100%)
---------------------------+-------------+----------------
---------------------------------+-------------+---------------
replace: "a" * length + "\udcff" | before | after
---------------------------------+-------------+---------------
length=10**1 | 1.16 us (*) | 319 ns (-72%)
length=10**3 | 2.25 us (*) | 1.62 us (-28%)
length=10**2 | 1.25 us (*) | 432 ns (-65%)
length=10**4 | 13.4 us (*) | 12.4 us (-7%)
---------------------------------+-------------+---------------
Total | 18 us (*) | 14.7 us (-18%)
---------------------------------+-------------+---------------
---------------------------------------------+-------------+---------------
replace: ("a" * 99 + "\udcff" * 99) * length | before | after
---------------------------------------------+-------------+---------------
length=10**1 | 267 us (*) | 2.52 us (-99%)
length=10**3 | 26.2 ms (*) | 210 us (-99%)
length=10**2 | 2.63 ms (*) | 21.3 us (-99%)
length=10**4 | 264 ms (*) | 2.98 ms (-99%)
---------------------------------------------+-------------+---------------
Total | 293 ms (*) | 3.21 ms (-99%)
---------------------------------------------+-------------+---------------
----------------------------------------+-------------+----------------
replace: ("\udcff" * 99 + "a") * length | before | after
----------------------------------------+-------------+----------------
length=10**1 | 263 us (*) | 1.29 us (-100%)
length=10**3 | 26.1 ms (*) | 86.6 us (-100%)
length=10**2 | 2.63 ms (*) | 9.02 us (-100%)
length=10**4 | 261 ms (*) | 925 us (-100%)
----------------------------------------+-------------+----------------
Total | 290 ms (*) | 1.02 ms (-100%)
----------------------------------------+-------------+----------------
---------------------------------+-------------+---------------
replace: "\udcff" + "a" * length | before | after
---------------------------------+-------------+---------------
length=10**1 | 1.14 us (*) | 317 ns (-72%)
length=10**3 | 2.24 us (*) | 1.6 us (-28%)
length=10**2 | 1.23 us (*) | 428 ns (-65%)
length=10**4 | 10.5 us (*) | 12.3 us (+17%)
---------------------------------+-------------+---------------
Total | 15.1 us (*) | 14.7 us
---------------------------------+-------------+---------------
-----------------------------------+-------------+---------------
surrogateescape: "\udcff" * length | before | after
-----------------------------------+-------------+---------------
length=10**1 | 3.48 us (*) | 281 ns (-92%)
length=10**3 | 267 us (*) | 1.77 us (-99%)
length=10**2 | 26.7 us (*) | 424 ns (-98%)
length=10**4 | 2.67 ms (*) | 13.9 us (-99%)
-----------------------------------+-------------+---------------
Total | 2.97 ms (*) | 16.3 us (-99%)
-----------------------------------+-------------+---------------
-----------------------------------------+-------------+---------------
surrogateescape: "a" * length + "\udcff" | before | after
-----------------------------------------+-------------+---------------
length=10**1 | 1.14 us (*) | 277 ns (-76%)
length=10**3 | 2.32 us (*) | 1.57 us (-32%)
length=10**2 | 1.24 us (*) | 391 ns (-68%)
length=10**4 | 10.6 us (*) | 12.3 us (+17%)
-----------------------------------------+-------------+---------------
Total | 15.3 us (*) | 14.6 us
-----------------------------------------+-------------+---------------
-----------------------------------------------------+-------------+---------------
surrogateescape: ("a" * 99 + "\udcff" * 99) * length | before |
after
-----------------------------------------------------+-------------+---------------
length=10**1 | 266 us (*) | 3.26 us
(-99%)
length=10**3 | 26.4 ms (*) | 285 us
(-99%)
length=10**2 | 2.65 ms (*) | 28.9 us
(-99%)
length=10**4 | 266 ms (*) | 3.73 ms
(-99%)
-----------------------------------------------------+-------------+---------------
Total | 295 ms (*) | 4.04 ms
(-99%)
-----------------------------------------------------+-------------+---------------
------------------------------------------------+-------------+---------------
surrogateescape: ("\udcff" * 99 + "a") * length | before | after
------------------------------------------------+-------------+---------------
length=10**1 | 265 us (*) | 2.04 us (-99%)
length=10**3 | 26.2 ms (*) | 165 us (-99%)
length=10**2 | 2.64 ms (*) | 17 us (-99%)
length=10**4 | 263 ms (*) | 1.75 ms (-99%)
------------------------------------------------+-------------+---------------
Total | 292 ms (*) | 1.93 ms (-99%)
------------------------------------------------+-------------+---------------
-----------------------------------------+-------------+---------------
surrogateescape: "\udcff" + "a" * length | before | after
-----------------------------------------+-------------+---------------
length=10**1 | 1.12 us (*) | 278 ns (-75%)
length=10**3 | 2.25 us (*) | 1.59 us (-29%)
length=10**2 | 1.21 us (*) | 389 ns (-68%)
length=10**4 | 10.5 us (*) | 12.3 us (+17%)
-----------------------------------------+-------------+---------------
Total | 15.1 us (*) | 14.6 us
-----------------------------------------+-------------+---------------
---------------------------------+-------------+---------------
surrogatepass: "\udcff" * length | before | after
---------------------------------+-------------+---------------
length=10**1 | 3.71 us (*) | 306 ns (-92%)
length=10**3 | 289 us (*) | 2.61 us (-99%)
length=10**2 | 28.9 us (*) | 532 ns (-98%)
length=10**4 | 2.88 ms (*) | 22.4 us (-99%)
---------------------------------+-------------+---------------
Total | 3.2 ms (*) | 25.8 us (-99%)
---------------------------------+-------------+---------------
---------------------------------------+-------------+---------------
surrogatepass: "a" * length + "\udcff" | before | after
---------------------------------------+-------------+---------------
length=10**1 | 1.16 us (*) | 299 ns (-74%)
length=10**3 | 2.36 us (*) | 1.59 us (-32%)
length=10**2 | 1.27 us (*) | 413 ns (-68%)
length=10**4 | 10.6 us (*) | 12.3 us (+16%)
---------------------------------------+-------------+---------------
Total | 15.4 us (*) | 14.6 us (-5%)
---------------------------------------+-------------+---------------
---------------------------------------------------+-------------+---------------
surrogatepass: ("a" * 99 + "\udcff" * 99) * length | before |
after
---------------------------------------------------+-------------+---------------
length=10**1 | 289 us (*) | 3.99 us
(-99%)
length=10**3 | 28.5 ms (*) | 362 us
(-99%)
length=10**2 | 2.86 ms (*) | 36.7 us
(-99%)
length=10**4 | 287 ms (*) | 5.18 ms
(-98%)
---------------------------------------------------+-------------+---------------
Total | 319 ms (*) | 5.59 ms
(-98%)
---------------------------------------------------+-------------+---------------
----------------------------------------------+-------------+---------------
surrogatepass: ("\udcff" * 99 + "a") * length | before | after
----------------------------------------------+-------------+---------------
length=10**1 | 288 us (*) | 2.91 us (-99%)
length=10**3 | 28.5 ms (*) | 242 us (-99%)
length=10**2 | 2.86 ms (*) | 24.7 us (-99%)
length=10**4 | 284 ms (*) | 2.53 ms (-99%)
----------------------------------------------+-------------+---------------
Total | 316 ms (*) | 2.8 ms (-99%)
----------------------------------------------+-------------+---------------
---------------------------------------+-------------+---------------
surrogatepass: "\udcff" + "a" * length | before | after
---------------------------------------+-------------+---------------
length=10**1 | 1.13 us (*) | 301 ns (-73%)
length=10**3 | 2.3 us (*) | 1.59 us (-31%)
length=10**2 | 1.24 us (*) | 409 ns (-67%)
length=10**4 | 10.6 us (*) | 12.1 us (+15%)
---------------------------------------+-------------+---------------
Total | 15.2 us (*) | 14.4 us (-5%)
---------------------------------------+-------------+---------------
------------------------------------+-------------+---------------
backslashreplace: "\udcff" * length | before | after
------------------------------------+-------------+---------------
length=10**1 | 4.28 us (*) | 1.58 us (-63%)
length=10**3 | 320 us (*) | 11.1 us (-97%)
length=10**2 | 32.3 us (*) | 2.56 us (-92%)
length=10**4 | 3.17 ms (*) | 96.6 us (-97%)
------------------------------------+-------------+---------------
Total | 3.52 ms (*) | 112 us (-97%)
------------------------------------+-------------+---------------
------------------------------------------+-------------+---------------
backslashreplace: "a" * length + "\udcff" | before | after
------------------------------------------+-------------+---------------
length=10**1 | 1.44 us (*) | 1.47 us
length=10**3 | 2.43 us (*) | 2.77 us (+14%)
length=10**2 | 1.52 us (*) | 1.64 us (+8%)
length=10**4 | 10.6 us (*) | 13.3 us (+25%)
------------------------------------------+-------------+---------------
Total | 16 us (*) | 19.2 us (+20%)
------------------------------------------+-------------+---------------
------------------------------------------------------+-------------+---------------
backslashreplace: ("a" * 99 + "\udcff" * 99) * length | before |
after
------------------------------------------------------+-------------+---------------
length=10**1 | 316 us (*) | 16 us
(-95%)
length=10**3 | 31.3 ms (*) | 1.46 ms
(-95%)
length=10**2 | 3.14 ms (*) | 147 us
(-95%)
length=10**4 | 313 ms (*) | 15.3 ms
(-95%)
------------------------------------------------------+-------------+---------------
Total | 347 ms (*) | 16.9 ms
(-95%)
------------------------------------------------------+-------------+---------------
-------------------------------------------------+-------------+---------------
backslashreplace: ("\udcff" * 99 + "a") * length | before | after
-------------------------------------------------+-------------+---------------
length=10**1 | 317 us (*) | 14.7 us (-95%)
length=10**3 | 31.3 ms (*) | 1.34 ms (-96%)
length=10**2 | 3.17 ms (*) | 135 us (-96%)
length=10**4 | 313 ms (*) | 13.8 ms (-96%)
-------------------------------------------------+-------------+---------------
Total | 347 ms (*) | 15.3 ms (-96%)
-------------------------------------------------+-------------+---------------
------------------------------------------+-------------+---------------
backslashreplace: "\udcff" + "a" * length | before | after
------------------------------------------+-------------+---------------
length=10**1 | 1.43 us (*) | 1.45 us
length=10**3 | 2.36 us (*) | 2.58 us (+9%)
length=10**2 | 1.51 us (*) | 1.57 us
length=10**4 | 10.5 us (*) | 13.2 us (+26%)
------------------------------------------+-------------+---------------
Total | 15.8 us (*) | 18.8 us (+19%)
------------------------------------------+-------------+---------------
------------------------------------------------------+--------------+----------------
Summary | before |
after
------------------------------------------------------+--------------+----------------
ignore: "\udcff" * length | 2.66 ms (*) | 8.19 us
(-100%)
ignore: "a" * length + "\udcff" | 15 us (*) |
14.6 us
ignore: ("a" * 99 + "\udcff" * 99) * length | 265 ms (*) | 2.82 ms
(-99%)
ignore: ("\udcff" * 99 + "a") * length | 263 ms (*) | 930 us
(-100%)
ignore: "\udcff" + "a" * length | 14.9 us (*) |
14.6 us
replace: "\udcff" * length | 2.94 ms (*) | 8.52 us
(-100%)
replace: "a" * length + "\udcff" | 18 us (*) | 14.7 us
(-18%)
replace: ("a" * 99 + "\udcff" * 99) * length | 293 ms (*) | 3.21 ms
(-99%)
replace: ("\udcff" * 99 + "a") * length | 290 ms (*) | 1.02 ms
(-100%)
replace: "\udcff" + "a" * length | 15.1 us (*) |
14.7 us
surrogateescape: "\udcff" * length | 2.97 ms (*) | 16.3 us
(-99%)
surrogateescape: "a" * length + "\udcff" | 15.3 us (*) |
14.6 us
surrogateescape: ("a" * 99 + "\udcff" * 99) * length | 295 ms (*) | 4.04 ms
(-99%)
surrogateescape: ("\udcff" * 99 + "a") * length | 292 ms (*) | 1.93 ms
(-99%)
surrogateescape: "\udcff" + "a" * length | 15.1 us (*) |
14.6 us
surrogatepass: "\udcff" * length | 3.2 ms (*) | 25.8 us
(-99%)
surrogatepass: "a" * length + "\udcff" | 15.4 us (*) | 14.6
us (-5%)
surrogatepass: ("a" * 99 + "\udcff" * 99) * length | 319 ms (*) | 5.59 ms
(-98%)
surrogatepass: ("\udcff" * 99 + "a") * length | 316 ms (*) | 2.8 ms
(-99%)
surrogatepass: "\udcff" + "a" * length | 15.2 us (*) | 14.4
us (-5%)
backslashreplace: "\udcff" * length | 3.52 ms (*) | 112 us
(-97%)
backslashreplace: "a" * length + "\udcff" | 16 us (*) | 19.2 us
(+20%)
backslashreplace: ("a" * 99 + "\udcff" * 99) * length | 347 ms (*) | 16.9 ms
(-95%)
backslashreplace: ("\udcff" * 99 + "a") * length | 347 ms (*) | 15.3 ms
(-96%)
backslashreplace: "\udcff" + "a" * length | 15.8 us (*) | 18.8 us
(+19%)
------------------------------------------------------+--------------+----------------
Total | 3.04 sec (*) | 54.9 ms
(-98%)
------------------------------------------------------+--------------+----------------
----------
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25267>
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