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05051b56a0
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Carlo Alberto Ferraris 05051b56a0 sync: allow inlining the RWMutex.RUnlock fast path 
RWMutex.RLock is already inlineable, so add a test for it as well.

name                    old time/op  new time/op  delta
RWMutexUncontended      66.5ns ± 0%  60.3ns ± 1%  -9.38%  (p=0.000 n=12+20)
RWMutexUncontended-4    16.7ns ± 0%  15.3ns ± 1%  -8.49%  (p=0.000 n=17+20)
RWMutexUncontended-16   7.86ns ± 0%  7.69ns ± 0%  -2.08%  (p=0.000 n=18+15)
RWMutexWrite100         25.1ns ± 0%  24.0ns ± 1%  -4.28%  (p=0.000 n=20+18)
RWMutexWrite100-4       46.7ns ± 5%  44.1ns ± 4%  -5.53%  (p=0.000 n=20+20)
RWMutexWrite100-16      68.3ns ±11%  65.7ns ± 8%  -3.81%  (p=0.003 n=20+20)
RWMutexWrite10          26.7ns ± 1%  25.7ns ± 0%  -3.75%  (p=0.000 n=17+14)
RWMutexWrite10-4        34.9ns ± 2%  33.8ns ± 2%  -3.15%  (p=0.000 n=20+20)
RWMutexWrite10-16       37.4ns ± 2%  36.1ns ± 2%  -3.51%  (p=0.000 n=18+20)
RWMutexWorkWrite100      163ns ± 0%   162ns ± 0%  -0.89%  (p=0.000 n=18+20)
RWMutexWorkWrite100-4    189ns ± 4%   184ns ± 4%  -2.89%  (p=0.000 n=19+20)
RWMutexWorkWrite100-16   207ns ± 4%   200ns ± 2%  -3.07%  (p=0.000 n=19+20)
RWMutexWorkWrite10       153ns ± 0%   151ns ± 1%  -0.75%  (p=0.000 n=20+20)
RWMutexWorkWrite10-4     177ns ± 1%   176ns ± 2%  -0.63%  (p=0.004 n=17+20)
RWMutexWorkWrite10-16    191ns ± 2%   189ns ± 1%  -0.83%  (p=0.015 n=20+17)

linux/amd64 bin/go 14688201 (previous commit 14675861, +12340/+0.08%)

The cumulative effect of this and the previous 3 commits is:

name                    old time/op  new time/op  delta
MutexUncontended        19.3ns ± 1%  16.4ns ± 1%  -15.13%  (p=0.000 n=20+20)
MutexUncontended-4      5.24ns ± 0%  4.09ns ± 0%  -21.95%  (p=0.000 n=20+18)
MutexUncontended-16     2.10ns ± 0%  2.12ns ± 0%   +0.95%  (p=0.000 n=15+17)
Mutex                   19.6ns ± 0%  16.3ns ± 1%  -17.12%  (p=0.000 n=20+20)
Mutex-4                 54.6ns ± 5%  45.6ns ±10%  -16.51%  (p=0.000 n=20+19)
Mutex-16                 133ns ± 5%   130ns ± 3%   -1.99%  (p=0.002 n=20+20)
MutexSlack              33.4ns ± 2%  16.2ns ± 0%  -51.44%  (p=0.000 n=19+20)
MutexSlack-4             206ns ± 5%   209ns ± 9%     ~     (p=0.154 n=20+20)
MutexSlack-16           89.4ns ± 1%  90.9ns ± 2%   +1.70%  (p=0.000 n=18+17)
MutexWork               60.5ns ± 0%  55.3ns ± 1%   -8.59%  (p=0.000 n=12+20)
MutexWork-4              105ns ± 5%    97ns ±11%   -7.95%  (p=0.000 n=20+20)
MutexWork-16             157ns ± 1%   158ns ± 1%   +0.66%  (p=0.001 n=18+17)
MutexWorkSlack          70.2ns ± 5%  55.3ns ± 0%  -21.30%  (p=0.000 n=19+18)
MutexWorkSlack-4         277ns ±13%   260ns ±15%   -6.35%  (p=0.002 n=20+18)
MutexWorkSlack-16        156ns ± 0%   146ns ± 1%   -6.40%  (p=0.000 n=16+19)
MutexNoSpin              966ns ± 0%   976ns ± 1%   +0.97%  (p=0.000 n=15+17)
MutexNoSpin-4            269ns ± 4%   272ns ± 4%   +1.15%  (p=0.048 n=20+18)
MutexNoSpin-16           122ns ± 0%   119ns ± 1%   -2.63%  (p=0.000 n=19+15)
MutexSpin               3.13µs ± 0%  3.12µs ± 0%   -0.17%  (p=0.000 n=18+18)
MutexSpin-4              826ns ± 1%   833ns ± 1%   +0.84%  (p=0.000 n=19+17)
MutexSpin-16             397ns ± 1%   394ns ± 1%   -0.78%  (p=0.000 n=19+19)
Once                    5.67ns ± 0%  2.07ns ± 2%  -63.43%  (p=0.000 n=20+20)
Once-4                  1.47ns ± 2%  0.54ns ± 3%  -63.49%  (p=0.000 n=19+20)
Once-16                 0.58ns ± 0%  0.17ns ± 5%  -70.49%  (p=0.000 n=17+17)
RWMutexUncontended      71.4ns ± 0%  60.3ns ± 1%  -15.60%  (p=0.000 n=16+20)
RWMutexUncontended-4    18.4ns ± 4%  15.3ns ± 1%  -17.14%  (p=0.000 n=20+20)
RWMutexUncontended-16   8.01ns ± 0%  7.69ns ± 0%   -3.91%  (p=0.000 n=18+15)
RWMutexWrite100         24.9ns ± 0%  24.0ns ± 1%   -3.57%  (p=0.000 n=19+18)
RWMutexWrite100-4       46.5ns ± 3%  44.1ns ± 4%   -5.09%  (p=0.000 n=17+20)
RWMutexWrite100-16      68.9ns ± 3%  65.7ns ± 8%   -4.65%  (p=0.000 n=18+20)
RWMutexWrite10          27.1ns ± 0%  25.7ns ± 0%   -5.25%  (p=0.000 n=17+14)
RWMutexWrite10-4        34.8ns ± 1%  33.8ns ± 2%   -2.96%  (p=0.000 n=20+20)
RWMutexWrite10-16       37.5ns ± 2%  36.1ns ± 2%   -3.72%  (p=0.000 n=20+20)
RWMutexWorkWrite100      164ns ± 0%   162ns ± 0%   -1.49%  (p=0.000 n=12+20)
RWMutexWorkWrite100-4    186ns ± 3%   184ns ± 4%     ~     (p=0.097 n=20+20)
RWMutexWorkWrite100-16   204ns ± 2%   200ns ± 2%   -1.58%  (p=0.000 n=18+20)
RWMutexWorkWrite10       153ns ± 0%   151ns ± 1%   -1.21%  (p=0.000 n=20+20)
RWMutexWorkWrite10-4     179ns ± 1%   176ns ± 2%   -1.25%  (p=0.000 n=19+20)
RWMutexWorkWrite10-16    191ns ± 1%   189ns ± 1%   -0.94%  (p=0.000 n=15+17)

Change-Id: I9269bf2ac42a04c610624f707d3268dcb17390f8
Reviewed-on: https://go-review.googlesource.com/c/go/+/152698
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
2019-03-09 16:34:17 +00:00
.github .github: don't render author-facing text in ISSUE_TEMPLATE 2018-11-02 04:47:34 +00:00
api text/scanner: don't liberally consume (invalid) floats or underbars 2019-02-20 20:23:28 +00:00
doc doc: add missing paragraph break in Effective Go 2019-03-07 04:46:03 +00:00
lib/time time: read 64-bit data if available 2019-02-26 23:10:35 +00:00
misc misc/android: enable many more tests on GOOS=android 2019-03-08 23:32:03 +00:00
src sync: allow inlining the RWMutex.RUnlock fast path 2019-03-09 16:34:17 +00:00
test sync: allow inlining the RWMutex.RUnlock fast path 2019-03-09 16:34:17 +00:00
.gitattributes
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: change email address for Elias Naur 2019-01-23 15:05:26 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS CONTRIBUTORS: second round of updates for Go 1.12 2019-01-30 18:01:19 +00:00
favicon.ico
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
PATENTS
README.md README: linkify some paths 2018-06-06 18:07:01 +00:00
robots.txt

README.md

The Go Programming Language

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