mime: use sync.Map instead of RWMutex for type lookups
This provides a significant speedup for TypeByExtension and
ExtensionsByType when using many CPU cores.
updates #17973
updates #18177
name old time/op new time/op delta
QEncodeWord 526ns ± 3% 525ns ± 3% ~ (p=0.990 n=15+28)
QEncodeWord-6 945ns ± 7% 913ns ±20% ~ (p=0.220 n=14+28)
QEncodeWord-48 1.02µs ± 2% 1.00µs ± 6% -2.22% (p=0.036 n=13+27)
QDecodeWord 311ns ±18% 323ns ±20% ~ (p=0.107 n=16+28)
QDecodeWord-6 595ns ±12% 612ns ±11% ~ (p=0.093 n=15+27)
QDecodeWord-48 592ns ± 6% 606ns ± 8% +2.39% (p=0.045 n=16+26)
QDecodeHeader 389ns ± 4% 394ns ± 8% ~ (p=0.161 n=12+26)
QDecodeHeader-6 685ns ±12% 674ns ±20% ~ (p=0.773 n=14+27)
QDecodeHeader-48 658ns ±13% 669ns ±14% ~ (p=0.457 n=16+28)
TypeByExtension/.html 77.4ns ±15% 55.5ns ±13% -28.35% (p=0.000 n=8+8)
TypeByExtension/.html-6 263ns ± 9% 10ns ±21% -96.29% (p=0.000 n=8+8)
TypeByExtension/.html-48 175ns ± 5% 2ns ±16% -98.88% (p=0.000 n=8+8)
TypeByExtension/.HTML 113ns ± 6% 97ns ± 6% -14.37% (p=0.000 n=8+8)
TypeByExtension/.HTML-6 273ns ± 7% 17ns ± 4% -93.93% (p=0.000 n=7+8)
TypeByExtension/.HTML-48 175ns ± 4% 4ns ± 4% -97.73% (p=0.000 n=8+8)
TypeByExtension/.unused 116ns ± 4% 90ns ± 4% -22.89% (p=0.001 n=7+7)
TypeByExtension/.unused-6 262ns ± 5% 15ns ± 4% -94.17% (p=0.000 n=8+8)
TypeByExtension/.unused-48 176ns ± 4% 3ns ±10% -98.10% (p=0.000 n=8+8)
ExtensionsByType/text/html 630ns ± 5% 522ns ± 5% -17.19% (p=0.000 n=8+7)
ExtensionsByType/text/html-6 314ns ±20% 136ns ± 6% -56.80% (p=0.000 n=8+8)
ExtensionsByType/text/html-48 298ns ± 4% 104ns ± 6% -65.06% (p=0.000 n=8+8)
ExtensionsByType/text/html;_charset=utf-8 1.12µs ± 3% 1.05µs ± 7% -6.19% (p=0.004 n=8+7)
ExtensionsByType/text/html;_charset=utf-8-6 402ns ±11% 307ns ± 4% -23.77% (p=0.000 n=8+8)
ExtensionsByType/text/html;_charset=utf-8-48 422ns ± 3% 309ns ± 4% -26.86% (p=0.000 n=8+8)
ExtensionsByType/application/octet-stream 810ns ± 2% 747ns ± 5% -7.74% (p=0.000 n=8+8)
ExtensionsByType/application/octet-stream-6 289ns ± 9% 185ns ± 8% -36.15% (p=0.000 n=7+8)
ExtensionsByType/application/octet-stream-48 267ns ± 6% 94ns ± 2% -64.91% (p=0.000 n=8+7)
name old alloc/op new alloc/op delta
QEncodeWord 48.0B ± 0% 48.0B ± 0% ~ (all equal)
QEncodeWord-6 48.0B ± 0% 48.0B ± 0% ~ (all equal)
QEncodeWord-48 48.0B ± 0% 48.0B ± 0% ~ (all equal)
QDecodeWord 48.0B ± 0% 48.0B ± 0% ~ (all equal)
QDecodeWord-6 48.0B ± 0% 48.0B ± 0% ~ (all equal)
QDecodeWord-48 48.0B ± 0% 48.0B ± 0% ~ (all equal)
QDecodeHeader 48.0B ± 0% 48.0B ± 0% ~ (all equal)
QDecodeHeader-6 48.0B ± 0% 48.0B ± 0% ~ (all equal)
QDecodeHeader-48 48.0B ± 0% 48.0B ± 0% ~ (all equal)
TypeByExtension/.html 0.00B 0.00B ~ (all equal)
TypeByExtension/.html-6 0.00B 0.00B ~ (all equal)
TypeByExtension/.html-48 0.00B 0.00B ~ (all equal)
TypeByExtension/.HTML 0.00B 0.00B ~ (all equal)
TypeByExtension/.HTML-6 0.00B 0.00B ~ (all equal)
TypeByExtension/.HTML-48 0.00B 0.00B ~ (all equal)
TypeByExtension/.unused 0.00B 0.00B ~ (all equal)
TypeByExtension/.unused-6 0.00B 0.00B ~ (all equal)
TypeByExtension/.unused-48 0.00B 0.00B ~ (all equal)
ExtensionsByType/text/html 192B ± 0% 176B ± 0% -8.33% (p=0.000 n=8+8)
ExtensionsByType/text/html-6 192B ± 0% 176B ± 0% -8.33% (p=0.000 n=8+8)
ExtensionsByType/text/html-48 192B ± 0% 176B ± 0% -8.33% (p=0.000 n=8+8)
ExtensionsByType/text/html;_charset=utf-8 480B ± 0% 464B ± 0% -3.33% (p=0.000 n=8+8)
ExtensionsByType/text/html;_charset=utf-8-6 480B ± 0% 464B ± 0% -3.33% (p=0.000 n=8+8)
ExtensionsByType/text/html;_charset=utf-8-48 480B ± 0% 464B ± 0% -3.33% (p=0.000 n=8+8)
ExtensionsByType/application/octet-stream 160B ± 0% 160B ± 0% ~ (all equal)
ExtensionsByType/application/octet-stream-6 160B ± 0% 160B ± 0% ~ (all equal)
ExtensionsByType/application/octet-stream-48 160B ± 0% 160B ± 0% ~ (all equal)
name old allocs/op new allocs/op delta
QEncodeWord 1.00 ± 0% 1.00 ± 0% ~ (all equal)
QEncodeWord-6 1.00 ± 0% 1.00 ± 0% ~ (all equal)
QEncodeWord-48 1.00 ± 0% 1.00 ± 0% ~ (all equal)
QDecodeWord 2.00 ± 0% 2.00 ± 0% ~ (all equal)
QDecodeWord-6 2.00 ± 0% 2.00 ± 0% ~ (all equal)
QDecodeWord-48 2.00 ± 0% 2.00 ± 0% ~ (all equal)
QDecodeHeader 2.00 ± 0% 2.00 ± 0% ~ (all equal)
QDecodeHeader-6 2.00 ± 0% 2.00 ± 0% ~ (all equal)
QDecodeHeader-48 2.00 ± 0% 2.00 ± 0% ~ (all equal)
TypeByExtension/.html 0.00 0.00 ~ (all equal)
TypeByExtension/.html-6 0.00 0.00 ~ (all equal)
TypeByExtension/.html-48 0.00 0.00 ~ (all equal)
TypeByExtension/.HTML 0.00 0.00 ~ (all equal)
TypeByExtension/.HTML-6 0.00 0.00 ~ (all equal)
TypeByExtension/.HTML-48 0.00 0.00 ~ (all equal)
TypeByExtension/.unused 0.00 0.00 ~ (all equal)
TypeByExtension/.unused-6 0.00 0.00 ~ (all equal)
TypeByExtension/.unused-48 0.00 0.00 ~ (all equal)
ExtensionsByType/text/html 3.00 ± 0% 3.00 ± 0% ~ (all equal)
ExtensionsByType/text/html-6 3.00 ± 0% 3.00 ± 0% ~ (all equal)
ExtensionsByType/text/html-48 3.00 ± 0% 3.00 ± 0% ~ (all equal)
ExtensionsByType/text/html;_charset=utf-8 4.00 ± 0% 4.00 ± 0% ~ (all equal)
ExtensionsByType/text/html;_charset=utf-8-6 4.00 ± 0% 4.00 ± 0% ~ (all equal)
ExtensionsByType/text/html;_charset=utf-8-48 4.00 ± 0% 4.00 ± 0% ~ (all equal)
ExtensionsByType/application/octet-stream 2.00 ± 0% 2.00 ± 0% ~ (all equal)
ExtensionsByType/application/octet-stream-6 2.00 ± 0% 2.00 ± 0% ~ (all equal)
ExtensionsByType/application/octet-stream-48 2.00 ± 0% 2.00 ± 0% ~ (all equal)
https://perf.golang.org/search?q=upload:
20170427.4
Change-Id: I35438be087ad6eb3d5da9119b395723ea5babaf6
Reviewed-on: https://go-review.googlesource.com/41990
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>