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Joe Tsai f0756ca2ea encoding/json: use sync.Map for field cache 
The previous type cache is quadratic in time in the situation where
new types are continually encountered. Now that it is possible to dynamically
create new types with the reflect package, this can cause json to
perform very poorly.

Switch to sync.Map which does well when the cache has hit steady state,
but also handles occasional updates in better than quadratic time.

benchmark                                     old ns/op      new ns/op     delta
BenchmarkTypeFieldsCache/MissTypes1-8         14817          16202         +9.35%
BenchmarkTypeFieldsCache/MissTypes10-8        70926          69144         -2.51%
BenchmarkTypeFieldsCache/MissTypes100-8       976467         208973        -78.60%
BenchmarkTypeFieldsCache/MissTypes1000-8      79520162       1750371       -97.80%
BenchmarkTypeFieldsCache/MissTypes10000-8     6873625837     16847806      -99.75%
BenchmarkTypeFieldsCache/HitTypes1000-8       7.51           8.80          +17.18%
BenchmarkTypeFieldsCache/HitTypes10000-8      7.58           8.68          +14.51%

The old implementation takes 12 minutes just to build a cache of size 1e5
due to the quadratic behavior. I did not bother benchmark sizes above that.

Change-Id: I5e6facc1eb8e1b80e5ca285e4dd2cc8815618dad
Reviewed-on: https://go-review.googlesource.com/76850
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 		2018-03-03 00:08:09 +00:00
.github github: update Pull Request template 2018-02-21 02:07:46 +00:00
api syscall: support Getwd on all BSDs 2018-02-13 15:41:19 +00:00
doc doc/faq: add a Q&A about virus scanners 2018-02-28 05:55:31 +00:00
lib/time all: use HTTPS for iana.org links 2018-02-13 18:36:48 +00:00
misc Revert "runtime: use bytes.IndexByte in findnull" 2018-03-01 22:22:51 +00:00
src encoding/json: use sync.Map for field cache 2018-03-03 00:08:09 +00:00
test test/codegen: add copyright headers to new codegen files 2018-03-02 20:13:13 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: update my name and spelling 2018-02-21 04:12:57 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS A+C: update my name and spelling 2018-02-21 04:12:57 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
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README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

Gopher image Gopher image by Renee French, licensed under Creative Commons 3.0 Attributions license.

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.

Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.

Download and Install

Binary Distributions

Official binary distributions are available at https://golang.org/dl/.

After downloading a binary release, visit https://golang.org/doc/install or load doc/install.html in your web browser for installation instructions.

Install From Source

If a binary distribution is not available for your combination of operating system and architecture, visit https://golang.org/doc/install/source or load doc/install-source.html in your web browser for source installation instructions.

Contributing

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

Note that the Go project uses the issue tracker for bug reports and proposals only. See https://golang.org/wiki/Questions for a list of places to ask questions about the Go language.