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The Go programming language
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The number of estimated iterations required to reach the benchtime is multiplied by a safety margin (to avoid falling just short) and then rounded up to a readable number. With an accurate estimate, in the worse case, the resulting number of iterations could be 3.75x more than necessary: 1.5x for safety * 2.5x to round up (e.g. from 2eX+1 to 5eX). This CL reduces the safety margin to 1.2x. Experimentation showed a diminishing margin of return past 1.2x, although the average case continued to show improvements down to 1.05x. This CL also reduces the maximum round-up multiplier from 2.5x (from 2eX+1 to 5eX) to 2x, by allowing the number of iterations to be of the form 3eX. Both changes improve benchmark wall clock times, and the effects are cumulative. From 1.5x to 1.2x safety margin: package old s new s delta bytes 163 125 -23% encoding/json 27 21 -22% net/http 42 36 -14% runtime 463 418 -10% strings 82 65 -21% Allowing 3eX iterations: package old s new s delta bytes 163 134 -18% encoding/json 27 23 -15% net/http 42 36 -14% runtime 463 422 -9% strings 82 72 -12% Combined: package old s new s delta bytes 163 112 -31% encoding/json 27 20 -26% net/http 42 30 -29% runtime 463 346 -25% strings 82 60 -27% LGTM=crawshaw, r, rsc R=golang-codereviews, crawshaw, r, rsc CC=golang-codereviews https://golang.org/cl/105990045 |
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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
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.