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ecfe42cab0
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Russ Cox ecfe42cab0 runtime: keep pointer bits set always in 1-word spans 
It's dumb to clear them in initSpan, set them in heapBitsSetType,
clear them in heapBitsSweepSpan, set them again in heapBitsSetType,
clear them again in heapBitsSweepSpan, and so on.

Set them in initSpan and be done with it (until the span is reused
for objects of a different size).

This avoids an atomic operation in a common case (one-word allocation).
Suggested by rlh.

name                   old mean              new mean              delta
BinaryTree17            5.87s × (0.97,1.03)   5.93s × (0.98,1.04)              ~    (p=0.056)
Fannkuch11              4.34s × (1.00,1.01)   4.41s × (1.00,1.00)            +1.42% (p=0.000)
FmtFprintfEmpty        86.1ns × (0.98,1.03)  88.9ns × (0.95,1.14)              ~    (p=0.066)
FmtFprintfString        292ns × (0.97,1.04)   284ns × (0.98,1.03)            -2.64% (p=0.000)
FmtFprintfInt           271ns × (0.98,1.06)   274ns × (0.98,1.05)              ~    (p=0.148)
FmtFprintfIntInt        478ns × (0.98,1.05)   487ns × (0.98,1.03)            +1.85% (p=0.004)
FmtFprintfPrefixedInt   397ns × (0.98,1.05)   394ns × (0.98,1.02)              ~    (p=0.184)
FmtFprintfFloat         553ns × (0.99,1.02)   543ns × (0.99,1.01)            -1.71% (p=0.000)
FmtManyArgs            1.90µs × (0.98,1.05)  1.88µs × (0.99,1.01)            -0.97% (p=0.037)
GobDecode              15.1ms × (0.99,1.01)  15.3ms × (0.99,1.01)            +0.78% (p=0.001)
GobEncode              11.7ms × (0.98,1.05)  11.6ms × (0.99,1.02)            -1.39% (p=0.009)
Gzip                    646ms × (1.00,1.01)   647ms × (1.00,1.01)              ~    (p=0.120)
Gunzip                  142ms × (1.00,1.00)   142ms × (1.00,1.00)              ~    (p=0.068)
HTTPClientServer       89.7µs × (0.99,1.01)  90.1µs × (0.98,1.03)              ~    (p=0.224)
JSONEncode             31.3ms × (0.99,1.01)  31.2ms × (0.99,1.02)              ~    (p=0.149)
JSONDecode              113ms × (0.99,1.01)   111ms × (0.99,1.01)            -1.25% (p=0.000)
Mandelbrot200          6.01ms × (1.00,1.00)  6.01ms × (1.00,1.00)            +0.09% (p=0.015)
GoParse                6.63ms × (0.98,1.03)  6.55ms × (0.99,1.02)            -1.10% (p=0.006)
RegexpMatchEasy0_32     161ns × (1.00,1.00)   161ns × (1.00,1.00)  (sample has zero variance)
RegexpMatchEasy0_1K     539ns × (0.99,1.01)   563ns × (0.99,1.01)            +4.51% (p=0.000)
RegexpMatchEasy1_32     140ns × (0.99,1.01)   141ns × (0.99,1.01)            +1.34% (p=0.000)
RegexpMatchEasy1_1K     886ns × (1.00,1.01)   888ns × (1.00,1.00)            +0.20% (p=0.003)
RegexpMatchMedium_32    252ns × (1.00,1.02)   255ns × (0.99,1.01)            +1.32% (p=0.000)
RegexpMatchMedium_1K   72.7µs × (1.00,1.00)  72.6µs × (1.00,1.00)              ~    (p=0.296)
RegexpMatchHard_32     3.84µs × (1.00,1.01)  3.84µs × (1.00,1.00)              ~    (p=0.339)
RegexpMatchHard_1K      117µs × (1.00,1.01)   117µs × (1.00,1.00)            -0.28% (p=0.022)
Revcomp                 914ms × (0.99,1.01)   909ms × (0.99,1.01)            -0.49% (p=0.031)
Template                128ms × (0.99,1.01)   127ms × (0.99,1.01)            -1.10% (p=0.000)
TimeParse               628ns × (0.99,1.01)   639ns × (0.99,1.01)            +1.69% (p=0.000)
TimeFormat              660ns × (0.99,1.01)   662ns × (0.99,1.02)              ~    (p=0.287)

Change-Id: I3127b0ab89708267c74aa7d0eae1db1a1bcdfda5
Reviewed-on: https://go-review.googlesource.com/9884
Reviewed-by: Austin Clements <austin@google.com>
2015-05-14 15:58:54 +00:00
api runtime: remove unused GC times from api.next 2015-05-06 14:49:26 +00:00
doc doc: mention net.SocketConn, net.SocketPacketConn in go1.5.txt 2015-05-13 21:41:08 +00:00
lib/time remove the obsolete lib/codereview. 2014-12-08 07:51:54 +00:00
misc misc/cgo/testcshared: remove use of 'env'. 2015-05-13 21:31:03 +00:00
src runtime: keep pointer bits set always in 1-word spans 2015-05-14 15:58:54 +00:00
test cmd/internal/gc: optimize slice + write barrier 2015-05-13 19:20:39 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore .gitignore: ignore ARM64 build products 2015-03-16 18:44:22 +00:00
AUTHORS A+C: add another email address for Emil Hessman 2014-11-12 10:01:23 -08:00
CONTRIBUTING.md doc: direct people to the mailing list 2015-01-18 21:27:07 +00:00
CONTRIBUTORS CONTRIBUTORS: add Burcu Dogan's personal mail 2015-05-06 16:06:42 +00:00
favicon.ico godoc: update favicon 2012-10-11 17:02:36 +11:00
LICENSE
PATENTS
README.md doc: fix broken link in README 2015-02-19 05:50:57 +00:00
robots.txt

README.md

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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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.

Please report issues here: https://golang.org/issue/new

Go is the work of hundreds of contributors. We appreciate your help!

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.