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The Go programming language
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Josh Bleecher Snyder 5c8013c561 cmd/guru: re-use buffer for reading files 
I felt guilty about leaving 2% on the table in CL 108878,
so I thought I'd get it a different way.

Teach readFile to accept a re-usable bytes.Buffer to read into,
to reduce the amount of garbage created.

To limit the possible memory impact of giant files,
only re-use the buffer for the duration of a single package.
Even that is enough to help.

name       old time/op       new time/op       delta
Referrers        4.67s ± 3%        4.58s ± 2%  -1.96%  (p=0.029 n=10+10)

name       old user-time/op  new user-time/op  delta
Referrers        16.5s ± 3%        15.8s ± 1%  -4.39%  (p=0.000 n=10+8)

name       old sys-time/op   new sys-time/op   delta
Referrers        16.1s ± 3%        15.9s ± 3%    ~     (p=0.218 n=10+10)

This work supported by Sourcegraph.

Change-Id: I594ef25c0fd5ccb766ff5b98dbbd1a75a7a4f957
Reviewed-on: https://go-review.googlesource.com/108935
Reviewed-by: Alan Donovan <adonovan@google.com>
2018-05-01 18:53:35 +00:00
benchmark/parse benchmark/parse: fix cosmetic defect in error str. 2015-02-02 17:07:43 +00:00
blog godoc,blog: perform minor cleanup 2018-04-14 19:30:04 +00:00
cmd cmd/guru: re-use buffer for reading files 2018-05-01 18:53:35 +00:00
container/intsets x/tools/container/intsets: add LowerBound 2017-08-21 16:11:21 +00:00
cover cover: handle multiple samples from the same location 2017-12-10 23:11:56 +00:00
go go/internal/gcimporter: support indexed export data 2018-04-26 19:07:32 +00:00
godoc godoc: don't exclude version field from File struct 2018-05-01 16:35:01 +00:00
imports imports: fix races in findImportGoPath 2018-04-30 20:17:55 +00:00
internal/fastwalk imports: extract fastWalk into new package internal/fastwalk 2018-04-16 19:53:52 +00:00
playground playground/socket: deflake test, remove sleep 2016-12-11 02:33:14 +00:00
present cmd/present: display slide numbers 2018-04-13 16:54:21 +00:00
refactor refactor/eg: Add support for multi line after statements to eg. 2018-03-19 17:51:41 +00:00
third_party cmd/heapview: dowgrade to customelements v0 2016-08-05 20:49:36 +00:00
.gitattributes tools: copying .gitattributes to all subrepositories (fixes windows build) 2014-12-23 06:32:51 +00:00
.gitignore .gitignore: roll back ".gitignore: ignore emacs backup files" 2018-02-13 00:43:28 +00:00
AUTHORS go.empty: prototype for new subrepository 2012-01-25 14:45:13 -05:00
codereview.cfg tools: add codereview.cfg 2015-03-18 17:04:00 +00:00
CONTRIBUTING.md CONTRIBUTING.md: remove note about not accepting Pull Requests 2018-03-14 18:02:17 +00:00
CONTRIBUTORS go.empty: prototype for new subrepository 2012-01-25 14:45:13 -05:00
LICENSE LICENSE: add 2012-03-17 15:20:58 +11:00
PATENTS go.empty: add PATENTS file to the subrepo. 2012-04-16 11:24:04 +10:00
README.md README: switch to Markdown and add links 2017-09-27 05:40:07 +00:00

README.md

Go Tools

This subrepository holds the source for various packages and tools that support the Go programming language.

Some of the tools, godoc and vet for example, are included in binary Go distributions.

Others, including the Go guru and the test coverage tool, can be fetched with go get.

Packages include a type-checker for Go and an implementation of the Static Single Assignment form (SSA) representation for Go programs.

Download/Install

The easiest way to install is to run go get -u golang.org/x/tools/.... You can also manually git clone the repository to $GOPATH/src/golang.org/x/tools.

Report Issues / Send Patches

This repository uses Gerrit for code changes. To learn how to submit changes to this repository, see https://golang.org/doc/contribute.html.

The main issue tracker for the tools repository is located at https://github.com/golang/go/issues. Prefix your issue with "x/tools/(your subdir):" in the subject line, so it is easy to find.