mirror of https://github.com/golang/go.git
4a18e0edd9
Instead of writing out 0..n and then reading it back, just use i when it is needed. Wikipedia calls this the "inside-out" implementation: http://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle This yields identical values to the previous implementation, given the same seed. (Note that the output from Example_rand is unchanged.) 2.8 GHz Intel Core i7, results very stable: benchmark old ns/op new ns/op delta BenchmarkPerm3 138 136 -1.45% BenchmarkPerm30 825 803 -2.67% Stock Raspberry Pi, minimum improvement out of three runs: benchmark old ns/op new ns/op delta BenchmarkPerm3 5774 5664 -1.91% BenchmarkPerm30 32582 29381 -9.82% R=golang-dev, dave, mtj, adg CC=golang-dev https://golang.org/cl/21030043 |
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README
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
in your web browser.
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.