79a990b845
Schedule the work as early as possible, while still respecting the utilization percentage on average. The old code tried never to go above the utilization percentage. The new code is willing to go above the utilization percentage by one time slice (but of course after doing that it must wait until the percentage drops back down to the target before it gets another time slice). The effect is that for concurrent GCs that can run in a small number of time slices, the time during which write barriers are enabled is reduced by one mutator + GC time slice round (possibly 30 ms per GC). This only affects the fractional GC processor (the remainder of GOMAXPROCS/4), so it matters most in GOMAXPROCS=1, a bit in GOMAXPROCS=2, and not at all in GOMAXPROCS=4. GOMAXPROCS=1 name old mean new mean delta BenchmarkBinaryTree17 12.4s × (0.98,1.03) 13.5s × (0.97,1.04) +8.84% (p=0.000) BenchmarkFannkuch11 4.38s × (1.00,1.01) 4.38s × (1.00,1.01) ~ (p=0.343) BenchmarkFmtFprintfEmpty 88.9ns × (0.97,1.10) 90.1ns × (0.93,1.14) ~ (p=0.224) BenchmarkFmtFprintfString 356ns × (0.94,1.05) 321ns × (0.94,1.12) -9.77% (p=0.000) BenchmarkFmtFprintfInt 344ns × (0.98,1.03) 325ns × (0.96,1.03) -5.46% (p=0.000) BenchmarkFmtFprintfIntInt 622ns × (0.97,1.03) 571ns × (0.95,1.05) -8.09% (p=0.000) BenchmarkFmtFprintfPrefixedInt 462ns × (0.96,1.04) 431ns × (0.95,1.05) -6.81% (p=0.000) BenchmarkFmtFprintfFloat 653ns × (0.98,1.03) 621ns × (0.99,1.03) -4.90% (p=0.000) BenchmarkFmtManyArgs 2.32µs × (0.97,1.03) 2.19µs × (0.98,1.02) -5.43% (p=0.000) BenchmarkGobDecode 27.0ms × (0.96,1.04) 20.0ms × (0.97,1.04) -26.06% (p=0.000) BenchmarkGobEncode 26.6ms × (0.99,1.01) 17.8ms × (0.95,1.05) -33.19% (p=0.000) BenchmarkGzip 659ms × (0.98,1.03) 650ms × (0.99,1.01) -1.34% (p=0.000) BenchmarkGunzip 145ms × (0.98,1.04) 143ms × (1.00,1.01) -1.47% (p=0.000) BenchmarkHTTPClientServer 111µs × (0.97,1.04) 110µs × (0.96,1.03) -1.30% (p=0.000) BenchmarkJSONEncode 52.0ms × (0.97,1.03) 40.8ms × (0.97,1.03) -21.47% (p=0.000) BenchmarkJSONDecode 127ms × (0.98,1.04) 120ms × (0.98,1.02) -5.55% (p=0.000) BenchmarkMandelbrot200 6.04ms × (0.99,1.04) 6.02ms × (1.00,1.01) ~ (p=0.176) BenchmarkGoParse 8.62ms × (0.96,1.08) 8.55ms × (0.93,1.09) ~ (p=0.302) BenchmarkRegexpMatchEasy0_32 164ns × (0.98,1.05) 165ns × (0.98,1.07) ~ (p=0.293) BenchmarkRegexpMatchEasy0_1K 546ns × (0.98,1.06) 547ns × (0.97,1.07) ~ (p=0.741) BenchmarkRegexpMatchEasy1_32 142ns × (0.97,1.09) 141ns × (0.97,1.05) ~ (p=0.231) BenchmarkRegexpMatchEasy1_1K 904ns × (0.97,1.07) 900ns × (0.98,1.04) ~ (p=0.294) BenchmarkRegexpMatchMedium_32 256ns × (0.98,1.06) 256ns × (0.97,1.04) ~ (p=0.530) BenchmarkRegexpMatchMedium_1K 74.2µs × (0.98,1.05) 73.8µs × (0.98,1.04) ~ (p=0.334) BenchmarkRegexpMatchHard_32 3.94µs × (0.98,1.07) 3.92µs × (0.98,1.05) ~ (p=0.356) BenchmarkRegexpMatchHard_1K 119µs × (0.98,1.07) 119µs × (0.98,1.06) ~ (p=0.467) BenchmarkRevcomp 978ms × (0.96,1.09) 984ms × (0.95,1.07) ~ (p=0.448) BenchmarkTemplate 151ms × (0.96,1.03) 142ms × (0.95,1.04) -5.55% (p=0.000) BenchmarkTimeParse 628ns × (0.99,1.01) 628ns × (0.99,1.01) ~ (p=0.855) BenchmarkTimeFormat 729ns × (0.98,1.06) 734ns × (0.97,1.05) ~ (p=0.149) GOMAXPROCS=2 name old mean new mean delta BenchmarkBinaryTree17-2 9.80s × (0.97,1.03) 9.85s × (0.99,1.02) ~ (p=0.444) BenchmarkFannkuch11-2 4.35s × (0.99,1.01) 4.40s × (0.98,1.05) ~ (p=0.099) BenchmarkFmtFprintfEmpty-2 86.7ns × (0.97,1.05) 85.9ns × (0.98,1.04) ~ (p=0.409) BenchmarkFmtFprintfString-2 297ns × (0.98,1.01) 297ns × (0.99,1.01) ~ (p=0.743) BenchmarkFmtFprintfInt-2 309ns × (0.98,1.02) 310ns × (0.99,1.01) ~ (p=0.464) BenchmarkFmtFprintfIntInt-2 525ns × (0.97,1.05) 518ns × (0.99,1.01) ~ (p=0.151) BenchmarkFmtFprintfPrefixedInt-2 408ns × (0.98,1.02) 408ns × (0.98,1.03) ~ (p=0.797) BenchmarkFmtFprintfFloat-2 603ns × (0.99,1.01) 604ns × (0.98,1.02) ~ (p=0.588) BenchmarkFmtManyArgs-2 2.07µs × (0.98,1.02) 2.05µs × (0.99,1.01) ~ (p=0.091) BenchmarkGobDecode-2 19.1ms × (0.97,1.01) 19.3ms × (0.97,1.04) ~ (p=0.195) BenchmarkGobEncode-2 16.2ms × (0.97,1.03) 16.4ms × (0.99,1.01) ~ (p=0.069) BenchmarkGzip-2 652ms × (0.99,1.01) 651ms × (0.99,1.01) ~ (p=0.705) BenchmarkGunzip-2 143ms × (1.00,1.01) 143ms × (1.00,1.00) ~ (p=0.665) BenchmarkHTTPClientServer-2 149µs × (0.92,1.11) 149µs × (0.91,1.08) ~ (p=0.862) BenchmarkJSONEncode-2 34.6ms × (0.98,1.02) 37.2ms × (0.99,1.01) +7.56% (p=0.000) BenchmarkJSONDecode-2 117ms × (0.99,1.01) 117ms × (0.99,1.01) ~ (p=0.858) BenchmarkMandelbrot200-2 6.10ms × (0.99,1.03) 6.03ms × (1.00,1.00) ~ (p=0.083) BenchmarkGoParse-2 8.25ms × (0.98,1.01) 8.21ms × (0.99,1.02) ~ (p=0.307) BenchmarkRegexpMatchEasy0_32-2 162ns × (0.99,1.02) 162ns × (0.99,1.01) ~ (p=0.857) BenchmarkRegexpMatchEasy0_1K-2 541ns × (0.99,1.01) 540ns × (1.00,1.00) ~ (p=0.530) BenchmarkRegexpMatchEasy1_32-2 138ns × (1.00,1.00) 141ns × (0.98,1.04) +1.88% (p=0.038) BenchmarkRegexpMatchEasy1_1K-2 887ns × (0.99,1.01) 894ns × (0.99,1.01) ~ (p=0.087) BenchmarkRegexpMatchMedium_32-2 252ns × (0.99,1.01) 252ns × (0.99,1.01) ~ (p=0.954) BenchmarkRegexpMatchMedium_1K-2 73.4µs × (0.99,1.02) 72.8µs × (1.00,1.01) -0.87% (p=0.029) BenchmarkRegexpMatchHard_32-2 3.95µs × (0.97,1.05) 3.87µs × (1.00,1.01) -2.11% (p=0.035) BenchmarkRegexpMatchHard_1K-2 117µs × (0.99,1.01) 117µs × (0.99,1.01) ~ (p=0.669) BenchmarkRevcomp-2 980ms × (0.95,1.03) 993ms × (0.94,1.09) ~ (p=0.527) BenchmarkTemplate-2 136ms × (0.98,1.01) 135ms × (0.99,1.01) ~ (p=0.200) BenchmarkTimeParse-2 630ns × (1.00,1.01) 630ns × (1.00,1.00) ~ (p=0.634) BenchmarkTimeFormat-2 705ns × (0.99,1.01) 710ns × (0.98,1.02) ~ (p=0.174) GOMAXPROCS=4 BenchmarkBinaryTree17-4 9.87s × (0.96,1.04) 9.75s × (0.96,1.03) ~ (p=0.178) BenchmarkFannkuch11-4 4.35s × (1.00,1.01) 4.40s × (0.99,1.04) ~ (p=0.071) BenchmarkFmtFprintfEmpty-4 85.8ns × (0.98,1.06) 85.6ns × (0.98,1.04) ~ (p=0.858) BenchmarkFmtFprintfString-4 306ns × (0.99,1.03) 304ns × (0.97,1.02) ~ (p=0.470) BenchmarkFmtFprintfInt-4 317ns × (0.98,1.01) 315ns × (0.98,1.02) -0.92% (p=0.044) BenchmarkFmtFprintfIntInt-4 527ns × (0.99,1.01) 525ns × (0.98,1.01) ~ (p=0.164) BenchmarkFmtFprintfPrefixedInt-4 421ns × (0.98,1.03) 417ns × (0.99,1.02) ~ (p=0.092) BenchmarkFmtFprintfFloat-4 623ns × (0.98,1.02) 618ns × (0.98,1.03) ~ (p=0.172) BenchmarkFmtManyArgs-4 2.09µs × (0.98,1.02) 2.09µs × (0.98,1.02) ~ (p=0.679) BenchmarkGobDecode-4 18.6ms × (0.99,1.01) 18.6ms × (0.98,1.03) ~ (p=0.595) BenchmarkGobEncode-4 15.0ms × (0.98,1.02) 15.1ms × (0.99,1.01) ~ (p=0.301) BenchmarkGzip-4 659ms × (0.98,1.04) 660ms × (0.97,1.02) ~ (p=0.724) BenchmarkGunzip-4 145ms × (0.98,1.04) 144ms × (0.99,1.04) ~ (p=0.671) BenchmarkHTTPClientServer-4 139µs × (0.97,1.02) 138µs × (0.99,1.02) ~ (p=0.392) BenchmarkJSONEncode-4 35.0ms × (0.99,1.02) 35.1ms × (0.98,1.02) ~ (p=0.777) BenchmarkJSONDecode-4 119ms × (0.98,1.01) 118ms × (0.98,1.02) ~ (p=0.710) BenchmarkMandelbrot200-4 6.02ms × (1.00,1.00) 6.02ms × (1.00,1.00) ~ (p=0.289) BenchmarkGoParse-4 7.96ms × (0.99,1.01) 7.96ms × (0.99,1.01) ~ (p=0.884) BenchmarkRegexpMatchEasy0_32-4 164ns × (0.98,1.04) 166ns × (0.97,1.04) ~ (p=0.221) BenchmarkRegexpMatchEasy0_1K-4 540ns × (0.99,1.01) 552ns × (0.97,1.04) +2.10% (p=0.018) BenchmarkRegexpMatchEasy1_32-4 140ns × (0.99,1.04) 142ns × (0.97,1.04) ~ (p=0.226) BenchmarkRegexpMatchEasy1_1K-4 896ns × (0.99,1.03) 907ns × (0.97,1.04) ~ (p=0.155) BenchmarkRegexpMatchMedium_32-4 255ns × (0.99,1.04) 255ns × (0.98,1.04) ~ (p=0.904) BenchmarkRegexpMatchMedium_1K-4 73.4µs × (0.99,1.04) 73.8µs × (0.98,1.04) ~ (p=0.560) BenchmarkRegexpMatchHard_32-4 3.93µs × (0.98,1.04) 3.95µs × (0.98,1.04) ~ (p=0.571) BenchmarkRegexpMatchHard_1K-4 117µs × (1.00,1.01) 119µs × (0.98,1.04) +1.48% (p=0.048) BenchmarkRevcomp-4 990ms × (0.94,1.08) 989ms × (0.94,1.10) ~ (p=0.957) BenchmarkTemplate-4 137ms × (0.98,1.02) 137ms × (0.99,1.01) ~ (p=0.996) BenchmarkTimeParse-4 629ns × (1.00,1.00) 629ns × (0.99,1.01) ~ (p=0.924) BenchmarkTimeFormat-4 710ns × (0.99,1.01) 716ns × (0.98,1.02) +0.84% (p=0.033) Change-Id: I43a04e0f6ad5e3ba9847dddf12e13222561f9cf4 Reviewed-on: https://go-review.googlesource.com/9543 Reviewed-by: Austin Clements <austin@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.
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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.