0d26efb12a
Currently we clear the heap bitmap of a span both when we allocate that span *and* when we free it. There's no point in doing both, and we definitely have to write the heap bitmap when we allocate a span for pointer-sized objects, so switch to clearing only when we allocate a span. This results in a slight overall performance improvement; however, most of the benchmarks that get slower are very short, while the longer benchmarks generally got faster. name old time/op new time/op delta XBenchGarbage-12 2.48ms ± 1% 2.47ms ± 1% -0.58% (p=0.000 n=91+91) name old time/op new time/op delta BinaryTree17-12 2.85s ± 2% 2.85s ± 2% ~ (p=0.550 n=20+19) Fannkuch11-12 2.54s ± 0% 2.47s ± 1% -2.72% (p=0.000 n=19+18) FmtFprintfEmpty-12 51.3ns ± 4% 51.0ns ± 3% ~ (p=0.223 n=20+20) FmtFprintfString-12 169ns ± 0% 167ns ± 0% -1.18% (p=0.000 n=17+16) FmtFprintfInt-12 160ns ± 0% 161ns ± 0% +0.63% (p=0.000 n=16+15) FmtFprintfIntInt-12 267ns ± 0% 269ns ± 1% +0.62% (p=0.000 n=17+20) FmtFprintfPrefixedInt-12 234ns ± 1% 240ns ± 0% +2.80% (p=0.000 n=20+20) FmtFprintfFloat-12 316ns ± 0% 313ns ± 0% -0.76% (p=0.000 n=20+19) FmtManyArgs-12 1.04µs ± 0% 1.05µs ± 0% +0.45% (p=0.000 n=19+16) GobDecode-12 7.90ms ± 1% 7.81ms ± 0% -1.10% (p=0.000 n=18+18) GobEncode-12 6.61ms ± 1% 6.58ms ± 0% -0.46% (p=0.000 n=20+15) Gzip-12 320ms ± 1% 322ms ± 1% +0.47% (p=0.030 n=20+20) Gunzip-12 42.4ms ± 1% 42.6ms ± 0% +0.37% (p=0.000 n=20+20) HTTPClientServer-12 70.7µs ± 1% 70.6µs ± 2% ~ (p=0.784 n=18+20) JSONEncode-12 16.9ms ± 1% 16.8ms ± 0% -0.64% (p=0.000 n=20+20) JSONDecode-12 60.8ms ± 0% 58.6ms ± 1% -3.50% (p=0.000 n=17+18) Mandelbrot200-12 3.92ms ± 0% 3.91ms ± 0% -0.25% (p=0.000 n=19+19) GoParse-12 3.65ms ± 0% 3.68ms ± 1% +0.67% (p=0.000 n=17+16) RegexpMatchEasy0_32-12 102ns ± 1% 102ns ± 2% +0.67% (p=0.009 n=19+19) RegexpMatchEasy0_1K-12 350ns ± 0% 351ns ± 1% +0.34% (p=0.002 n=20+20) RegexpMatchEasy1_32-12 84.1ns ± 2% 84.2ns ± 2% ~ (p=0.799 n=20+18) RegexpMatchEasy1_1K-12 510ns ± 1% 508ns ± 1% -0.45% (p=0.000 n=20+17) RegexpMatchMedium_32-12 132ns ± 1% 134ns ± 1% +0.85% (p=0.000 n=20+19) RegexpMatchMedium_1K-12 40.0µs ± 1% 39.9µs ± 1% -0.29% (p=0.014 n=19+18) RegexpMatchHard_32-12 2.09µs ± 1% 2.05µs ± 0% -1.76% (p=0.000 n=20+18) RegexpMatchHard_1K-12 62.7µs ± 1% 61.8µs ± 1% -1.39% (p=0.000 n=20+19) Revcomp-12 541ms ± 1% 534ms ± 0% -1.16% (p=0.000 n=19+20) Template-12 71.1ms ± 0% 69.1ms ± 0% -2.83% (p=0.000 n=18+19) TimeParse-12 356ns ± 0% 357ns ± 0% +0.36% (p=0.000 n=17+19) TimeFormat-12 358ns ± 0% 372ns ± 1% +3.74% (p=0.000 n=15+18) [Geo mean] 62.6µs 62.5µs -0.25% Change-Id: Ied190b77c7a4d91ec7b2218c592fc31cf7acf362 Reviewed-on: https://go-review.googlesource.com/19633 Reviewed-by: Rick Hudson <rlh@golang.org> Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> |
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The Go Programming Language
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For documentation about how to install and use Go, visit https://golang.org/ or load doc/install-source.html in your web browser.
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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.