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95a11c7381
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Ian Davis 95a11c7381 net/url: remove an allocation for short strings in escape 
Use a 64 byte array to avoid an allocation on the assumption that
most url escaping is performed on short strings. Also adds a fast
path for escaping strings whose only replacements are spaces which
is common in query components.

Adds benchmarks for QueryEscape, PathEscape, QueryUnescape and
PathUnescape but no optimizations are include for the unescape functions
so I don't include those benchmark results here.

Reduces allocations by 10% in the existing String benchmark with a
modest performance increase.

name               old time/op    new time/op    delta
QueryEscape/#00-8    64.6ns ± 1%    43.8ns ± 0%  -32.14%  (p=0.000 n=9+9)
QueryEscape/#01-8     276ns ± 3%     249ns ± 0%   -9.62%  (p=0.000 n=10+7)
QueryEscape/#02-8     176ns ± 2%     155ns ± 3%  -12.21%  (p=0.000 n=10+10)
QueryEscape/#03-8     388ns ± 1%     362ns ± 0%   -6.55%  (p=0.000 n=10+8)
QueryEscape/#04-8    2.32µs ± 2%    2.27µs ± 2%   -2.26%  (p=0.001 n=10+10)
PathEscape/#00-8     78.0ns ± 3%    63.4ns ± 1%  -18.69%  (p=0.000 n=10+10)
PathEscape/#01-8      276ns ± 2%     260ns ± 0%   -6.01%  (p=0.000 n=10+10)
PathEscape/#02-8      175ns ± 0%     153ns ± 0%  -12.53%  (p=0.000 n=8+10)
PathEscape/#03-8      389ns ± 2%     361ns ± 0%   -7.21%  (p=0.000 n=10+9)
PathEscape/#04-8     2.30µs ± 2%    2.27µs ± 1%   -1.33%  (p=0.001 n=9+10)
String-8             3.56µs ± 4%    3.42µs ± 7%   -4.00%  (p=0.003 n=10+10)

name               old alloc/op   new alloc/op   delta
QueryEscape/#00-8     16.0B ± 0%      8.0B ± 0%  -50.00%  (p=0.000 n=10+10)
QueryEscape/#01-8      128B ± 0%       64B ± 0%  -50.00%  (p=0.000 n=10+10)
QueryEscape/#02-8     64.0B ± 0%     32.0B ± 0%  -50.00%  (p=0.000 n=10+10)
QueryEscape/#03-8      128B ± 0%       64B ± 0%  -50.00%  (p=0.000 n=10+10)
QueryEscape/#04-8      832B ± 0%      832B ± 0%     ~     (all equal)
PathEscape/#00-8      32.0B ± 0%     16.0B ± 0%  -50.00%  (p=0.000 n=10+10)
PathEscape/#01-8       128B ± 0%       64B ± 0%  -50.00%  (p=0.000 n=10+10)
PathEscape/#02-8      64.0B ± 0%     32.0B ± 0%  -50.00%  (p=0.000 n=10+10)
PathEscape/#03-8       128B ± 0%       64B ± 0%  -50.00%  (p=0.000 n=10+10)
PathEscape/#04-8       704B ± 0%      704B ± 0%     ~     (all equal)
String-8             1.84kB ± 0%    1.66kB ± 0%   -9.57%  (p=0.000 n=10+10)

name               old allocs/op  new allocs/op  delta
QueryEscape/#00-8      2.00 ± 0%      1.00 ± 0%  -50.00%  (p=0.000 n=10+10)
QueryEscape/#01-8      2.00 ± 0%      1.00 ± 0%  -50.00%  (p=0.000 n=10+10)
QueryEscape/#02-8      2.00 ± 0%      1.00 ± 0%  -50.00%  (p=0.000 n=10+10)
QueryEscape/#03-8      2.00 ± 0%      1.00 ± 0%  -50.00%  (p=0.000 n=10+10)
QueryEscape/#04-8      2.00 ± 0%      2.00 ± 0%     ~     (all equal)
PathEscape/#00-8       2.00 ± 0%      1.00 ± 0%  -50.00%  (p=0.000 n=10+10)
PathEscape/#01-8       2.00 ± 0%      1.00 ± 0%  -50.00%  (p=0.000 n=10+10)
PathEscape/#02-8       2.00 ± 0%      1.00 ± 0%  -50.00%  (p=0.000 n=10+10)
PathEscape/#03-8       2.00 ± 0%      1.00 ± 0%  -50.00%  (p=0.000 n=10+10)
PathEscape/#04-8       2.00 ± 0%      2.00 ± 0%     ~     (all equal)
String-8               69.0 ± 0%      61.0 ± 0%  -11.59%  (p=0.000 n=10+10)

Updates #17860

Change-Id: I45c5e9d40b242f874c61f6ccc73bf94c494bb868
Reviewed-on: https://go-review.googlesource.com/134296
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-09-11 12:25:22 +00:00
.github .github: use HTTPS for Stack Overflow link in SUPPORT.md 2018-06-12 11:08:14 +00:00
api syscall: implement Unix Socket for Windows 2018-08-28 09:26:45 +00:00
doc doc: make golang-nuts discussion list more prominent 2018-09-08 19:47:06 +00:00
lib/time lib/time: update vendored tzdata to release 2018e 2018-06-11 14:47:06 +00:00
misc misc/cgo/testplugin: disable DWARF tests on darwin 2018-09-05 11:27:37 +00:00
src net/url: remove an allocation for short strings in escape 2018-09-11 12:25:22 +00:00
test test: extend noescape bytes.Buffer test suite 2018-09-07 18:49:12 +00:00
.gitattributes
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: add VMware as author, Venil Noronha as contributor 2018-08-31 02:14:24 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS A+C: add VMware as author, Venil Noronha as contributor 2018-08-31 02:14:24 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
LICENSE
PATENTS
README.md README: linkify some paths 2018-06-06 18:07:01 +00:00
robots.txt

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