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The Go programming language
0e97f4187e
As much as 7x speedup on some programs, cuts all.bash time by 20%. Change splicebefore function from O(n) to O(1). The approach was suggested by Carl during the code's review but apparently did not make it into the tree. It makes a huge difference on huge programs. Make twobitwalktype1 slightly faster by using & instead of %. Really it needs to be cached; left a note to that effect. (Not a complete fix, hence the ½.) big.go (output of test/chan/select5.go) 47.53u 0.50s 48.14r before this CL 7.09u 0.47s 7.59r with splicebefore change (6.7x speedup) 6.15u 0.42s 6.59r with twobitwalktype1 change (1.15x speedup; total 7.7x) slow.go (variant of program in go.text, by mpvl) 77.75u 2.11s 80.03r before this CL 24.40u 1.97s 26.44r with splicebefore change (3.2x speedup) 18.12u 2.19s 20.38r with twobitwalktype1 change (1.35x speedup; total 4.3x) test/run 150.63u 49.57s 81.08r before this CL 88.01u 45.60s 46.65r after this CL (1.7x speedup) all.bash 369.70u 115.64s 256.21r before this CL 298.52u 110.35s 214.67r after this CL (1.24x speedup) The test programs are at https://rsc.googlecode.com/hg/testdata/big.go (36k lines, 276kB) https://rsc.googlecode.com/hg/testdata/slow.go (7k lines, 352kB) R=golang-codereviews, gobot, r CC=cshapiro, golang-codereviews https://golang.org/cl/43210045 |
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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
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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.