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The Go programming language
c3dadca977
Walking the stack by frames is ~3x more expensive than not, and since it didn't end up being precise, there is not enough benefit to outweigh the cost. This is the conservative choice: this CL makes the stack scanning behavior the same as it was in Go 1.1. Add benchmarks to package runtime so that we have them when we re-enable this feature during the Go 1.3 development. benchmark old ns/op new ns/op delta BenchmarkGoroutineSelect 3194909 1272092 -60.18% BenchmarkGoroutineBlocking 3120282 866366 -72.23% BenchmarkGoroutineForRange 3256179 939902 -71.13% BenchmarkGoroutineIdle 2005571 482982 -75.92% The Go 1 benchmarks, just to add more data. As far as I can tell the changes are mainly noise. benchmark old ns/op new ns/op delta BenchmarkBinaryTree17 4409403046 4414734932 +0.12% BenchmarkFannkuch11 3407708965 3378306120 -0.86% BenchmarkFmtFprintfEmpty 100 99 -0.60% BenchmarkFmtFprintfString 242 239 -1.24% BenchmarkFmtFprintfInt 204 206 +0.98% BenchmarkFmtFprintfIntInt 320 316 -1.25% BenchmarkFmtFprintfPrefixedInt 295 299 +1.36% BenchmarkFmtFprintfFloat 442 435 -1.58% BenchmarkFmtManyArgs 1246 1216 -2.41% BenchmarkGobDecode 10186951 10051210 -1.33% BenchmarkGobEncode 16504381 16445650 -0.36% BenchmarkGzip 447030885 447056865 +0.01% BenchmarkGunzip 111056154 111696305 +0.58% BenchmarkHTTPClientServer 89973 93040 +3.41% BenchmarkJSONEncode 28174182 27933893 -0.85% BenchmarkJSONDecode 106353777 110443817 +3.85% BenchmarkMandelbrot200 4822289 4806083 -0.34% BenchmarkGoParse 6102436 6142734 +0.66% BenchmarkRegexpMatchEasy0_32 133 132 -0.75% BenchmarkRegexpMatchEasy0_1K 372 373 +0.27% BenchmarkRegexpMatchEasy1_32 113 111 -1.77% BenchmarkRegexpMatchEasy1_1K 964 940 -2.49% BenchmarkRegexpMatchMedium_32 202 205 +1.49% BenchmarkRegexpMatchMedium_1K 68862 68858 -0.01% BenchmarkRegexpMatchHard_32 3480 3407 -2.10% BenchmarkRegexpMatchHard_1K 108255 112614 +4.03% BenchmarkRevcomp 751393035 743929976 -0.99% BenchmarkTemplate 139637041 135402220 -3.03% BenchmarkTimeParse 479 475 -0.84% BenchmarkTimeFormat 460 466 +1.30% benchmark old MB/s new MB/s speedup BenchmarkGobDecode 75.34 76.36 1.01x BenchmarkGobEncode 46.50 46.67 1.00x BenchmarkGzip 43.41 43.41 1.00x BenchmarkGunzip 174.73 173.73 0.99x BenchmarkJSONEncode 68.87 69.47 1.01x BenchmarkJSONDecode 18.25 17.57 0.96x BenchmarkGoParse 9.49 9.43 0.99x BenchmarkRegexpMatchEasy0_32 239.58 241.74 1.01x BenchmarkRegexpMatchEasy0_1K 2749.74 2738.00 1.00x BenchmarkRegexpMatchEasy1_32 282.49 286.32 1.01x BenchmarkRegexpMatchEasy1_1K 1062.00 1088.96 1.03x BenchmarkRegexpMatchMedium_32 4.93 4.86 0.99x BenchmarkRegexpMatchMedium_1K 14.87 14.87 1.00x BenchmarkRegexpMatchHard_32 9.19 9.39 1.02x BenchmarkRegexpMatchHard_1K 9.46 9.09 0.96x BenchmarkRevcomp 338.26 341.65 1.01x BenchmarkTemplate 13.90 14.33 1.03x Fixes #6482. R=golang-dev, dave, r CC=golang-dev https://golang.org/cl/14257043 |
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This is the source code repository for the Go programming language.
For documentation about how to install and use Go,
visit http://golang.org/ or load doc/install.html in your web browser.
After installing Go, you can view a nicely formatted
doc/install.html by running godoc --http=:6060
and then visiting http://localhost:6060/doc/install.html.
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 README). 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.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 doc/install.html for more details.