0adf6dce8a
It doesn't seem to help on modern processors and it makes Go impossible to run on Pentium MMX (which is the documented minimum hardware requirement.) Old is with prefetch, new is w/o. Both are compiled with GO386=sse2. Benchmarking is done on Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz. name old time/op new time/op delta BinaryTree17-4 2.89s ± 2% 2.87s ± 0% ~ (p=0.061 n=11+10) Fannkuch11-4 3.65s ± 0% 3.65s ± 0% ~ (p=0.365 n=11+11) FmtFprintfEmpty-4 52.1ns ± 0% 52.1ns ± 0% ~ (p=0.065 n=10+9) FmtFprintfString-4 168ns ± 0% 167ns ± 0% -0.48% (p=0.000 n=8+10) FmtFprintfInt-4 167ns ± 0% 167ns ± 1% ~ (p=0.591 n=9+10) FmtFprintfIntInt-4 295ns ± 0% 292ns ± 0% -0.99% (p=0.000 n=9+10) FmtFprintfPrefixedInt-4 327ns ± 0% 326ns ± 0% -0.24% (p=0.007 n=10+10) FmtFprintfFloat-4 431ns ± 0% 431ns ± 0% -0.07% (p=0.000 n=10+11) FmtManyArgs-4 1.13µs ± 0% 1.13µs ± 0% -0.37% (p=0.009 n=11+11) GobDecode-4 9.36ms ± 1% 9.33ms ± 0% -0.31% (p=0.006 n=11+10) GobEncode-4 7.38ms ± 1% 7.38ms ± 1% ~ (p=0.797 n=11+11) Gzip-4 394ms ± 0% 395ms ± 1% ~ (p=0.519 n=11+11) Gunzip-4 65.4ms ± 0% 65.4ms ± 0% ~ (p=0.739 n=10+10) HTTPClientServer-4 52.4µs ± 1% 52.5µs ± 1% ~ (p=0.748 n=11+11) JSONEncode-4 19.0ms ± 0% 19.0ms ± 0% ~ (p=0.780 n=9+10) JSONDecode-4 59.6ms ± 0% 59.6ms ± 0% ~ (p=0.720 n=9+10) Mandelbrot200-4 4.09ms ± 0% 4.09ms ± 0% ~ (p=0.295 n=11+9) GoParse-4 3.45ms ± 1% 3.43ms ± 1% -0.35% (p=0.040 n=11+11) RegexpMatchEasy0_32-4 101ns ± 1% 101ns ± 1% ~ (p=1.000 n=11+11) RegexpMatchEasy0_1K-4 796ns ± 0% 796ns ± 0% ~ (p=0.954 n=10+8) RegexpMatchEasy1_32-4 110ns ± 0% 110ns ± 1% ~ (p=0.289 n=9+11) RegexpMatchEasy1_1K-4 991ns ± 0% 991ns ± 0% ~ (p=0.784 n=10+8) RegexpMatchMedium_32-4 131ns ± 0% 130ns ± 0% -0.42% (p=0.004 n=11+9) RegexpMatchMedium_1K-4 41.9µs ± 1% 41.6µs ± 0% ~ (p=0.067 n=11+9) RegexpMatchHard_32-4 2.34µs ± 0% 2.34µs ± 0% ~ (p=0.208 n=11+11) RegexpMatchHard_1K-4 70.9µs ± 0% 71.0µs ± 0% ~ (p=0.968 n=9+10) Revcomp-4 819ms ± 0% 818ms ± 0% ~ (p=0.251 n=10+11) Template-4 73.9ms ± 0% 73.8ms ± 0% -0.25% (p=0.013 n=10+11) TimeParse-4 414ns ± 0% 414ns ± 0% ~ (p=0.809 n=11+10) TimeFormat-4 485ns ± 0% 485ns ± 0% ~ (p=0.404 n=11+7) name old speed new speed delta GobDecode-4 82.0MB/s ± 1% 82.3MB/s ± 0% +0.31% (p=0.007 n=11+10) GobEncode-4 104MB/s ± 1% 104MB/s ± 1% ~ (p=0.797 n=11+11) Gzip-4 49.2MB/s ± 0% 49.1MB/s ± 1% ~ (p=0.507 n=11+11) Gunzip-4 297MB/s ± 0% 297MB/s ± 0% ~ (p=0.670 n=10+10) JSONEncode-4 102MB/s ± 0% 102MB/s ± 0% ~ (p=0.794 n=9+10) JSONDecode-4 32.6MB/s ± 0% 32.6MB/s ± 0% ~ (p=0.334 n=9+9) GoParse-4 16.8MB/s ± 1% 16.9MB/s ± 1% ~ (p=0.052 n=11+11) RegexpMatchEasy0_32-4 314MB/s ± 0% 314MB/s ± 1% ~ (p=0.618 n=11+11) RegexpMatchEasy0_1K-4 1.29GB/s ± 0% 1.29GB/s ± 0% ~ (p=0.315 n=10+10) RegexpMatchEasy1_32-4 290MB/s ± 1% 290MB/s ± 1% ~ (p=0.667 n=10+11) RegexpMatchEasy1_1K-4 1.03GB/s ± 0% 1.03GB/s ± 0% ~ (p=0.829 n=10+8) RegexpMatchMedium_32-4 7.63MB/s ± 0% 7.65MB/s ± 0% ~ (p=0.142 n=11+11) RegexpMatchMedium_1K-4 24.4MB/s ± 1% 24.6MB/s ± 0% ~ (p=0.063 n=11+9) RegexpMatchHard_32-4 13.7MB/s ± 0% 13.7MB/s ± 0% ~ (p=0.302 n=11+11) RegexpMatchHard_1K-4 14.4MB/s ± 0% 14.4MB/s ± 0% ~ (p=0.784 n=9+10) Revcomp-4 310MB/s ± 0% 311MB/s ± 0% ~ (p=0.243 n=10+11) Template-4 26.2MB/s ± 0% 26.3MB/s ± 0% +0.24% (p=0.009 n=10+11) Update #12970. Change-Id: Id185080687a60c229a5cb2e5220e7ca1b53910e2 Reviewed-on: https://go-review.googlesource.com/15999 Reviewed-by: Austin Clements <austin@google.com> Reviewed-by: Dmitry Vyukov <dvyukov@google.com> |
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The Go Programming Language
Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
For documentation about how to install and use Go, visit https://golang.org/ or load doc/install-source.html in your web browser.
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.
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To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html
Note that we do not accept pull requests and that we use the issue tracker for bug reports and proposals only. Please ask questions on https://forum.golangbridge.org or https://groups.google.com/forum/#!forum/golang-nuts.
Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.
--
Binary Distribution Notes
If you have just untarred a binary Go distribution, you need to set the environment variable $GOROOT to the full path of the go directory (the one containing this file). You can omit the variable if you unpack it into /usr/local/go, or if you rebuild from sources by running all.bash (see doc/install-source.html). You should also add the Go binary directory $GOROOT/bin to your shell's path.
For example, if you extracted the tar file into $HOME/go, you might put the following in your .profile:
export GOROOT=$HOME/go
export PATH=$PATH:$GOROOT/bin
See https://golang.org/doc/install or doc/install.html for more details.