commit | e1446d9cee91af263af15efe8291644b590bb9ff | [log] [tgz] |
---|---|---|
author | Ben Schwartz <bemasc@google.com> | Mon Jun 10 12:29:23 2019 -0400 |
committer | Keith Randall <khr@golang.org> | Mon Oct 07 20:58:04 2019 +0000 |
tree | 3396c06dc84aa47c4c07411331afad5ed22993a5 | |
parent | a0894ea5b5c326f1ddc7c4c6674d5858f8761dc8 [diff] |
runtime: speed up receive on empty closed channel Currently, nonblocking receive on an open channel is about 700 times faster than nonblocking receive on a closed channel. This change makes closed channels equally fast. Fixes #32529 relevant benchstat output: name old time/op new time/op delta MakeChan/Byte-40 140ns ± 4% 137ns ± 7% -2.38% (p=0.023 n=17+19) MakeChan/Int-40 174ns ± 5% 173ns ± 6% ~ (p=0.437 n=18+19) MakeChan/Ptr-40 315ns ±15% 301ns ±15% ~ (p=0.051 n=20+20) MakeChan/Struct/0-40 123ns ± 8% 99ns ±11% -19.18% (p=0.000 n=20+17) MakeChan/Struct/32-40 297ns ± 8% 241ns ±18% -19.13% (p=0.000 n=20+20) MakeChan/Struct/40-40 344ns ± 5% 273ns ±23% -20.49% (p=0.000 n=20+20) ChanNonblocking-40 0.32ns ± 2% 0.32ns ± 2% -1.25% (p=0.000 n=19+18) SelectUncontended-40 5.72ns ± 1% 5.71ns ± 2% ~ (p=0.326 n=19+19) SelectSyncContended-40 10.9µs ±10% 10.6µs ± 3% -2.77% (p=0.009 n=20+16) SelectAsyncContended-40 1.00µs ± 0% 1.10µs ± 0% +10.75% (p=0.000 n=18+19) SelectNonblock-40 1.22ns ± 2% 1.21ns ± 4% ~ (p=0.141 n=18+19) ChanUncontended-40 240ns ± 4% 233ns ± 4% -2.82% (p=0.000 n=20+20) ChanContended-40 86.7µs ± 0% 82.7µs ± 0% -4.64% (p=0.000 n=20+19) ChanSync-40 294ns ± 7% 284ns ± 9% -3.44% (p=0.006 n=20+20) ChanSyncWork-40 38.4µs ±19% 34.0µs ± 4% -11.33% (p=0.000 n=20+18) ChanProdCons0-40 1.50µs ± 1% 1.63µs ± 0% +8.53% (p=0.000 n=19+19) ChanProdCons10-40 1.17µs ± 0% 1.18µs ± 1% +0.44% (p=0.000 n=19+20) ChanProdCons100-40 985ns ± 0% 959ns ± 1% -2.64% (p=0.000 n=20+20) ChanProdConsWork0-40 1.50µs ± 0% 1.60µs ± 2% +6.54% (p=0.000 n=18+20) ChanProdConsWork10-40 1.26µs ± 0% 1.26µs ± 2% +0.40% (p=0.015 n=20+19) ChanProdConsWork100-40 1.27µs ± 0% 1.22µs ± 0% -4.15% (p=0.000 n=20+19) SelectProdCons-40 1.50µs ± 1% 1.53µs ± 1% +1.95% (p=0.000 n=20+20) ChanCreation-40 82.1ns ± 5% 81.6ns ± 7% ~ (p=0.483 n=19+19) ChanSem-40 877ns ± 0% 719ns ± 0% -17.98% (p=0.000 n=18+19) ChanPopular-40 1.75ms ± 2% 1.78ms ± 3% +1.76% (p=0.002 n=20+19) ChanClosed-40 215ns ± 1% 0ns ± 6% -99.82% (p=0.000 n=20+18) Change-Id: I6d5ca4f1530cc9e1a9f3ef553bbda3504a036448 Reviewed-on: https://go-review.googlesource.com/c/go/+/181543 Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
Gopher image by Renee French, licensed under Creative Commons 3.0 Attributions license.
Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.
Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.
Official binary distributions are available at https://golang.org/dl/.
After downloading a binary release, visit https://golang.org/doc/install or load doc/install.html in your web browser for installation instructions.
If a binary distribution is not available for your combination of operating system and architecture, visit https://golang.org/doc/install/source or load doc/install-source.html in your web browser for source installation instructions.
Go is the work of thousands of contributors. We appreciate your help!
To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html
Note that the Go project uses the issue tracker for bug reports and proposals only. See https://golang.org/wiki/Questions for a list of places to ask questions about the Go language.