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A write *p = x that needs a write barrier (not all do) now turns into runtime.writebarrierptr(p, x) or one of the other variants. The write barrier implementations are trivial. The goal here is to emit the calls in the correct places and to incur the cost of those function calls in the Go 1.4 cycle. Performance on the Go 1 benchmark suite below. Remember, the goal is to slow things down (and be correct). We will look into optimizations in separate CLs, as part of the process of comparing Go 1.3 against tip in order to make sure Go 1.4 runs at least as fast as Go 1.3. benchmark old ns/op new ns/op delta BenchmarkBinaryTree17 3118336716 3452876110 +10.73% BenchmarkFannkuch11 3184497677 3211552284 +0.85% BenchmarkFmtFprintfEmpty 89.9 107 +19.02% BenchmarkFmtFprintfString 236 287 +21.61% BenchmarkFmtFprintfInt 246 278 +13.01% BenchmarkFmtFprintfIntInt 395 458 +15.95% BenchmarkFmtFprintfPrefixedInt 343 378 +10.20% BenchmarkFmtFprintfFloat 477 525 +10.06% BenchmarkFmtManyArgs 1446 1707 +18.05% BenchmarkGobDecode 14398047 14685958 +2.00% BenchmarkGobEncode 12557718 12947104 +3.10% BenchmarkGzip 453462345 472413285 +4.18% BenchmarkGunzip 114226016 115127398 +0.79% BenchmarkHTTPClientServer 114689 112122 -2.24% BenchmarkJSONEncode 24914536 26135942 +4.90% BenchmarkJSONDecode 86832877 103620289 +19.33% BenchmarkMandelbrot200 4833452 4898780 +1.35% BenchmarkGoParse 4317976 4835474 +11.98% BenchmarkRegexpMatchEasy0_32 150 166 +10.67% BenchmarkRegexpMatchEasy0_1K 393 402 +2.29% BenchmarkRegexpMatchEasy1_32 125 142 +13.60% BenchmarkRegexpMatchEasy1_1K 1010 1236 +22.38% BenchmarkRegexpMatchMedium_32 232 301 +29.74% BenchmarkRegexpMatchMedium_1K 76963 102721 +33.47% BenchmarkRegexpMatchHard_32 3833 5463 +42.53% BenchmarkRegexpMatchHard_1K 119668 161614 +35.05% BenchmarkRevcomp 763449047 706768534 -7.42% BenchmarkTemplate 124954724 134834549 +7.91% BenchmarkTimeParse 517 511 -1.16% BenchmarkTimeFormat 501 514 +2.59% benchmark old MB/s new MB/s speedup BenchmarkGobDecode 53.31 52.26 0.98x BenchmarkGobEncode 61.12 59.28 0.97x BenchmarkGzip 42.79 41.08 0.96x BenchmarkGunzip 169.88 168.55 0.99x BenchmarkJSONEncode 77.89 74.25 0.95x BenchmarkJSONDecode 22.35 18.73 0.84x BenchmarkGoParse 13.41 11.98 0.89x BenchmarkRegexpMatchEasy0_32 213.30 191.72 0.90x BenchmarkRegexpMatchEasy0_1K 2603.92 2542.74 0.98x BenchmarkRegexpMatchEasy1_32 254.00 224.93 0.89x BenchmarkRegexpMatchEasy1_1K 1013.53 827.98 0.82x BenchmarkRegexpMatchMedium_32 4.30 3.31 0.77x BenchmarkRegexpMatchMedium_1K 13.30 9.97 0.75x BenchmarkRegexpMatchHard_32 8.35 5.86 0.70x BenchmarkRegexpMatchHard_1K 8.56 6.34 0.74x BenchmarkRevcomp 332.92 359.62 1.08x BenchmarkTemplate 15.53 14.39 0.93x LGTM=rlh R=rlh CC=dvyukov, golang-codereviews, iant, khr, r https://golang.org/cl/136380043 |
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| doc | ||
| include | ||
| lib | ||
| misc | ||
| src | ||
| test | ||
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| .hgtags | ||
| AUTHORS | ||
| CONTRIBUTORS | ||
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| LICENSE | ||
| PATENTS | ||
| README | ||
| robots.txt | ||
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-source.html
in your web browser.
After installing Go, you can view a nicely formatted
doc/install-source.html by running godoc --http=:6060
and then visiting http://localhost:6060/doc/install/source.
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.