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author | Carlo Alberto Ferraris <cafxx@strayorange.com> | 2018-11-10 08:28:44 +0900 |
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committer | Brad Fitzpatrick <bradfitz@golang.org> | 2019-03-05 14:59:31 +0000 |
commit | 4c3f26076b6a9853bcc3c7d7e43726c044ac028a (patch) | |
tree | d154c2aed2f92cfb8203c49485d08267243f6378 /test/inline_sync.go | |
parent | 94cbfc2f7f6b375426381c81d8efe78b12e058c3 (diff) | |
download | go-git-4c3f26076b6a9853bcc3c7d7e43726c044ac028a.tar.gz |
sync: allow inlining the Mutex.Unlock fast path
Make use of the newly-enabled limited midstack inlining.
Similar changes will be done in followup CLs.
name old time/op new time/op delta
MutexUncontended 19.3ns ± 1% 18.9ns ± 0% -1.92% (p=0.000 n=20+19)
MutexUncontended-4 5.24ns ± 0% 4.75ns ± 1% -9.25% (p=0.000 n=20+20)
MutexUncontended-16 2.10ns ± 0% 2.05ns ± 0% -2.38% (p=0.000 n=15+19)
Mutex 19.6ns ± 0% 19.3ns ± 1% -1.92% (p=0.000 n=20+17)
Mutex-4 54.6ns ± 5% 52.4ns ± 4% -4.09% (p=0.000 n=20+20)
Mutex-16 133ns ± 5% 139ns ± 2% +4.23% (p=0.000 n=20+16)
MutexSlack 33.4ns ± 2% 18.9ns ± 1% -43.56% (p=0.000 n=19+20)
MutexSlack-4 206ns ± 5% 225ns ± 8% +9.12% (p=0.000 n=20+18)
MutexSlack-16 89.4ns ± 1% 98.4ns ± 1% +10.10% (p=0.000 n=18+17)
MutexWork 60.5ns ± 0% 58.2ns ± 3% -3.75% (p=0.000 n=12+20)
MutexWork-4 105ns ± 5% 103ns ± 7% -1.68% (p=0.007 n=20+20)
MutexWork-16 157ns ± 1% 163ns ± 2% +3.90% (p=0.000 n=18+18)
MutexWorkSlack 70.2ns ± 5% 57.7ns ± 1% -17.81% (p=0.000 n=19+20)
MutexWorkSlack-4 277ns ±13% 276ns ±13% ~ (p=0.682 n=20+19)
MutexWorkSlack-16 156ns ± 0% 147ns ± 0% -5.62% (p=0.000 n=16+14)
MutexNoSpin 966ns ± 0% 968ns ± 0% +0.11% (p=0.029 n=15+20)
MutexNoSpin-4 269ns ± 4% 270ns ± 2% ~ (p=0.807 n=20+19)
MutexNoSpin-16 122ns ± 0% 120ns ± 4% -1.63% (p=0.000 n=19+19)
MutexSpin 3.13µs ± 0% 3.13µs ± 1% +0.16% (p=0.004 n=18+20)
MutexSpin-4 826ns ± 1% 832ns ± 2% +0.74% (p=0.000 n=19+16)
MutexSpin-16 397ns ± 1% 395ns ± 0% -0.50% (p=0.000 n=19+17)
RWMutexUncontended 71.4ns ± 0% 69.5ns ± 0% -2.72% (p=0.000 n=16+20)
RWMutexUncontended-4 18.4ns ± 4% 17.5ns ± 0% -4.92% (p=0.000 n=20+18)
RWMutexUncontended-16 8.01ns ± 0% 7.92ns ± 0% -1.15% (p=0.000 n=18+18)
RWMutexWrite100 24.9ns ± 0% 24.9ns ± 1% ~ (p=0.099 n=19+20)
RWMutexWrite100-4 46.5ns ± 3% 46.2ns ± 4% ~ (p=0.253 n=17+19)
RWMutexWrite100-16 68.9ns ± 3% 69.9ns ± 5% +1.46% (p=0.012 n=18+20)
RWMutexWrite10 27.1ns ± 0% 27.0ns ± 2% ~ (p=0.128 n=17+20)
RWMutexWrite10-4 34.8ns ± 1% 34.7ns ± 2% ~ (p=0.180 n=20+18)
RWMutexWrite10-16 37.5ns ± 2% 37.2ns ± 4% -0.89% (p=0.023 n=20+20)
RWMutexWorkWrite100 164ns ± 0% 164ns ± 0% ~ (p=0.106 n=12+20)
RWMutexWorkWrite100-4 186ns ± 3% 193ns ± 3% +3.46% (p=0.000 n=20+20)
RWMutexWorkWrite100-16 204ns ± 2% 210ns ± 3% +2.96% (p=0.000 n=18+20)
RWMutexWorkWrite10 153ns ± 0% 153ns ± 0% -0.20% (p=0.017 n=20+19)
RWMutexWorkWrite10-4 179ns ± 1% 178ns ± 2% ~ (p=0.215 n=19+20)
RWMutexWorkWrite10-16 191ns ± 1% 192ns ± 2% ~ (p=0.166 n=15+19)
linux/amd64 bin/go 14630572 (previous commit 14605947, +24625/+0.17%)
Change-Id: I3f9d1765801fe0b8deb1bc2728b8bba8a7508e23
Reviewed-on: https://go-review.googlesource.com/c/go/+/148958
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Diffstat (limited to 'test/inline_sync.go')
-rw-r--r-- | test/inline_sync.go | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/test/inline_sync.go b/test/inline_sync.go new file mode 100644 index 0000000000..271414d5f0 --- /dev/null +++ b/test/inline_sync.go @@ -0,0 +1,24 @@ +// +build !nacl,!386 +// errorcheck -0 -m + +// Copyright 2019 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Test, using compiler diagnostic flags, that inlining of functions +// imported from the sync package is working. +// Compiles but does not run. +// FIXME: nacl-386 is excluded as inlining currently does not work there. + +package foo + +import ( + "sync" +) + +var mutex *sync.Mutex + +func small5() { // ERROR "can inline small5" + // the Unlock fast path should be inlined + mutex.Unlock() // ERROR "inlining call to sync\.\(\*Mutex\)\.Unlock" "&sync\.m\.state escapes to heap" +} |