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Mike Spreitzer b4a40cd43e Draft weighted and timing histograms
The following investigation occurred during development.

Add TimingHistogram impl that shares lock with WeightedHistogram

Benchmarking and profiling shows that two layers of locking is
noticeably more expensive than one.

After adding this new alternative, I now get the following benchmark
results.

```
(base) mspreitz@mjs12 kubernetes % go test -benchmem -run=^$ -bench ^BenchmarkTimingHistogram$ k8s.io/component-base/metrics/prometheusextension
goos: darwin
goarch: amd64
pkg: k8s.io/component-base/metrics/prometheusextension
cpu: Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
BenchmarkTimingHistogram-16    	22232037	        52.79 ns/op	       0 B/op	       0 allocs/op
PASS
ok  	k8s.io/component-base/metrics/prometheusextension	1.404s

(base) mspreitz@mjs12 kubernetes % go test -benchmem -run=^$ -bench ^BenchmarkTimingHistogram$ k8s.io/component-base/metrics/prometheusextension
goos: darwin
goarch: amd64
pkg: k8s.io/component-base/metrics/prometheusextension
cpu: Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
BenchmarkTimingHistogram-16    	22190997	        54.50 ns/op	       0 B/op	       0 allocs/op
PASS
ok  	k8s.io/component-base/metrics/prometheusextension	1.435s
```

and

```
(base) mspreitz@mjs12 kubernetes % go test -benchmem -run=^$ -bench ^BenchmarkTimingHistogramDirect$ k8s.io/component-base/metrics/prometheusextension
goos: darwin
goarch: amd64
pkg: k8s.io/component-base/metrics/prometheusextension
cpu: Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
BenchmarkTimingHistogramDirect-16    	28863244	        40.99 ns/op	       0 B/op	       0 allocs/op
PASS
ok  	k8s.io/component-base/metrics/prometheusextension	1.890s
(base) mspreitz@mjs12 kubernetes %
(base) mspreitz@mjs12 kubernetes %
(base) mspreitz@mjs12 kubernetes % go test -benchmem -run=^$ -bench ^BenchmarkTimingHistogramDirect$ k8s.io/component-base/metrics/prometheusextension
goos: darwin
goarch: amd64
pkg: k8s.io/component-base/metrics/prometheusextension
cpu: Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
BenchmarkTimingHistogramDirect-16    	27994173	        40.37 ns/op	       0 B/op	       0 allocs/op
PASS
ok  	k8s.io/component-base/metrics/prometheusextension	1.384s
```

So the new implementation is roughly 20% faster than the original.

Add overlooked exception, rename timingHistogram to timingHistogramLayered

Use the direct (one mutex) style of TimingHistogram impl

This is about a 20% gain in CPU speed on my development machine, in
benchmarks without lock contention.  Following are two consecutive
trials.

(base) mspreitz@mjs12 prometheusextension % go test  -benchmem -run=^$ -bench Histogram .
goos: darwin
goarch: amd64
pkg: k8s.io/component-base/metrics/prometheusextension
cpu: Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
BenchmarkTimingHistogramLayered-16    	21650905	        51.91 ns/op	       0 B/op	       0 allocs/op
BenchmarkTimingHistogramDirect-16     	29876860	        39.33 ns/op	       0 B/op	       0 allocs/op
BenchmarkWeightedHistogram-16         	49227044	        24.13 ns/op	       0 B/op	       0 allocs/op
BenchmarkHistogram-16                 	41063907	        28.82 ns/op	       0 B/op	       0 allocs/op
PASS
ok  	k8s.io/component-base/metrics/prometheusextension	5.432s

(base) mspreitz@mjs12 prometheusextension % go test  -benchmem -run=^$ -bench Histogram .
goos: darwin
goarch: amd64
pkg: k8s.io/component-base/metrics/prometheusextension
cpu: Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
BenchmarkTimingHistogramLayered-16    	22483816	        51.72 ns/op	       0 B/op	       0 allocs/op
BenchmarkTimingHistogramDirect-16     	29697291	        39.39 ns/op	       0 B/op	       0 allocs/op
BenchmarkWeightedHistogram-16         	48919845	        24.03 ns/op	       0 B/op	       0 allocs/op
BenchmarkHistogram-16                 	41153044	        29.26 ns/op	       0 B/op	       0 allocs/op
PASS
ok  	k8s.io/component-base/metrics/prometheusextension	5.044s

Remove layered implementation of TimingHistogram
2022-04-28 17:36:06 -04:00
.github Fix typo in bug report template 2022-02-28 12:34:43 +03:00
api Merge pull request #107178 from SataQiu/deprecated-20211222 2022-04-01 21:22:10 -07:00
build Switch to pause 3.7 2022-03-29 15:36:38 -04:00
CHANGELOG CHANGELOG: Update directory for v1.24.0-beta.0 release 2022-03-31 09:21:59 +00:00
cluster Switch to pause 3.7 2022-03-29 15:36:38 -04:00
cmd Merge pull request #107178 from SataQiu/deprecated-20211222 2022-04-01 21:22:10 -07:00
docs OWNERS cleanup - Jan 2021 Week 1 2022-01-10 08:14:29 -05:00
hack Draft weighted and timing histograms 2022-04-28 17:36:06 -04:00
LICENSES Correctly attribute some datastructures from gotestsum repository 2022-04-01 14:49:15 -04:00
logo Create colors.md 2021-01-15 22:15:43 -08:00
pkg Merge pull request #105599 from jonyhy96/fix-pod-workers-test 2022-04-02 06:50:09 -07:00
plugin Introduce APIs to support multiple ClusterCIDRs (#108290) 2022-03-30 19:39:00 -07:00
staging Draft weighted and timing histograms 2022-04-28 17:36:06 -04:00
test Merge pull request #109222 from pacoxu/flake-nfs 2022-04-01 21:22:22 -07:00
third_party Correctly attribute some datastructures from gotestsum repository 2022-04-01 14:49:15 -04:00
vendor Merge pull request #108016 from jiahuif-forks/feature/leader-migration-v1-api 2022-03-31 15:49:05 -07:00
.generated_files Purge almost all memories of godep 2020-05-07 21:49:00 -07:00
.gitattributes review staging go.mod files 2019-05-10 15:40:43 -04:00
.gitignore Add the last zz_generated.openapi.go file 2022-02-28 10:17:54 -08:00
.golangci.yaml hack: integrate logcheck into golangci-lint 2022-03-24 11:21:03 +01:00
CHANGELOG.md CHANGELOG: Move changelog, soft-link to top-level, refresh listing 2020-02-06 01:04:44 -05:00
code-of-conduct.md
CONTRIBUTING.md Remove stale analytics links from docs 2020-11-18 07:04:48 -06:00
go.mod Update docker/distribution to 2.8.1 to fix checksum error 2022-03-30 18:25:47 -04:00
go.sum Update docker/distribution to 2.8.1 to fix checksum error 2022-03-30 18:25:47 -04:00
LICENSE
Makefile
Makefile.generated_files
OWNERS for ./OWNERS, ensure approvers are in reviewers and emeritus approvers are not in reviewers 2022-02-03 22:43:04 -08:00
OWNERS_ALIASES Remove johnbelamaric as sig-network reviewer and approver 2022-03-23 13:41:49 -07:00
README.md update the repository to incorporate project health best practices from clomonitor.io 2022-02-18 18:11:35 +00:00
SECURITY_CONTACTS Update SECURITY_CONTACTS with current PSC 2019-05-29 15:22:35 +05:30
SUPPORT.md delete all duplicate empty blanks 2019-02-23 10:28:04 +08:00

Kubernetes (K8s)

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Kubernetes, also known as K8s, is an open source system for managing containerized applications across multiple hosts. It provides basic mechanisms for deployment, maintenance, and scaling of applications.

Kubernetes builds upon a decade and a half of experience at Google running production workloads at scale using a system called Borg, combined with best-of-breed ideas and practices from the community.

Kubernetes is hosted by the Cloud Native Computing Foundation (CNCF). If your company wants to help shape the evolution of technologies that are container-packaged, dynamically scheduled, and microservices-oriented, consider joining the CNCF. For details about who's involved and how Kubernetes plays a role, read the CNCF announcement.


To start using K8s

See our documentation on kubernetes.io.

Try our interactive tutorial.

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The community repository hosts all information about building Kubernetes from source, how to contribute code and documentation, who to contact about what, etc.

If you want to build Kubernetes right away there are two options:

You have a working Go environment.
mkdir -p $GOPATH/src/k8s.io
cd $GOPATH/src/k8s.io
git clone https://github.com/kubernetes/kubernetes
cd kubernetes
make
You have a working Docker environment.
git clone https://github.com/kubernetes/kubernetes
cd kubernetes
make quick-release

For the full story, head over to the developer's documentation.

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The Kubernetes Community is the launching point for learning about how we organize ourselves.

The Kubernetes Steering community repo is used by the Kubernetes Steering Committee, which oversees governance of the Kubernetes project.

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