899a4ad47e
Optimized heapBitsForObject by special casing objects whose size is a power of two. When a span holding such objects is initialized I added a mask that when &ed with an interior pointer results in the base of the pointer. For the garbage benchmark this resulted in CPU_CLK_UNHALTED in heapBitsForObject going from 7.7% down to 5.9% of the total, INST_RETIRED went from 12.2 -> 8.7. Here are the benchmarks that were at lease plus or minus 1%. benchmark old ns/op new ns/op delta BenchmarkFmtFprintfString 249 221 -11.24% BenchmarkFmtFprintfInt 247 223 -9.72% BenchmarkFmtFprintfEmpty 76.5 69.6 -9.02% BenchmarkBinaryTree17 4106631412 3744550160 -8.82% BenchmarkFmtFprintfFloat 424 399 -5.90% BenchmarkGoParse 4484421 4242115 -5.40% BenchmarkGobEncode 8803668 8449107 -4.03% BenchmarkFmtManyArgs 1494 1436 -3.88% BenchmarkGobDecode 10431051 10032606 -3.82% BenchmarkFannkuch11 2591306713 2517400464 -2.85% BenchmarkTimeParse 361 371 +2.77% BenchmarkJSONDecode 70620492 68830357 -2.53% BenchmarkRegexpMatchMedium_1K 54693 53343 -2.47% BenchmarkTemplate 90008879 91929940 +2.13% BenchmarkTimeFormat 380 387 +1.84% BenchmarkRegexpMatchEasy1_32 111 113 +1.80% BenchmarkJSONEncode 21359159 21007583 -1.65% BenchmarkRegexpMatchEasy1_1K 603 613 +1.66% BenchmarkRegexpMatchEasy0_32 127 129 +1.57% BenchmarkFmtFprintfIntInt 399 393 -1.50% BenchmarkRegexpMatchEasy0_1K 373 378 +1.34% Change-Id: I78e297161026f8b5cc7507c965fd3e486f81ed29 Reviewed-on: https://go-review.googlesource.com/8980 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.
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
Please note that we do not use pull requests.
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.