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72 lines
2.5 KiB
Markdown
72 lines
2.5 KiB
Markdown
# automaxprocs [![GoDoc][doc-img]][doc] [![Build Status][ci-img]][ci] [![Coverage Status][cov-img]][cov]
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Automatically set `GOMAXPROCS` to match Linux container CPU quota.
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## Installation
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`go get -u go.uber.org/automaxprocs`
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## Quick Start
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```go
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import _ "go.uber.org/automaxprocs"
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func main() {
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// Your application logic here.
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}
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```
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# Performance
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Data measured from Uber's internal load balancer. We ran the load balancer with 200% CPU quota (i.e., 2 cores):
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| GOMAXPROCS | RPS | P50 (ms) | P99.9 (ms) |
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| ------------------ | --------- | -------- | ---------- |
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| 1 | 28,893.18 | 1.46 | 19.70 |
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| 2 (equal to quota) | 44,715.07 | 0.84 | 26.38 |
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| 3 | 44,212.93 | 0.66 | 30.07 |
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| 4 | 41,071.15 | 0.57 | 42.94 |
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| 8 | 33,111.69 | 0.43 | 64.32 |
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| Default (24) | 22,191.40 | 0.45 | 76.19 |
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When `GOMAXPROCS` is increased above the CPU quota, we see P50 decrease slightly, but see significant increases to P99. We also see that the total RPS handled also decreases.
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When `GOMAXPROCS` is higher than the CPU quota allocated, we also saw significant throttling:
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```
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$ cat /sys/fs/cgroup/cpu,cpuacct/system.slice/[...]/cpu.stat
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nr_periods 42227334
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nr_throttled 131923
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throttled_time 88613212216618
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```
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Once `GOMAXPROCS` was reduced to match the CPU quota, we saw no CPU throttling.
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## Development Status: Stable
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All APIs are finalized, and no breaking changes will be made in the 1.x series
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of releases. Users of semver-aware dependency management systems should pin
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automaxprocs to `^1`.
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## Contributing
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We encourage and support an active, healthy community of contributors —
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including you! Details are in the [contribution guide](CONTRIBUTING.md) and
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the [code of conduct](CODE_OF_CONDUCT.md). The automaxprocs maintainers keep
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an eye on issues and pull requests, but you can also report any negative
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conduct to oss-conduct@uber.com. That email list is a private, safe space;
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even the automaxprocs maintainers don't have access, so don't hesitate to hold
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us to a high standard.
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<hr>
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Released under the [MIT License](LICENSE).
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[doc-img]: https://godoc.org/go.uber.org/automaxprocs?status.svg
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[doc]: https://godoc.org/go.uber.org/automaxprocs
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[ci-img]: https://github.com/uber-go/automaxprocs/actions/workflows/go.yml/badge.svg
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[ci]: https://github.com/uber-go/automaxprocs/actions/workflows/go.yml
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[cov-img]: https://codecov.io/gh/uber-go/automaxprocs/branch/master/graph/badge.svg
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[cov]: https://codecov.io/gh/uber-go/automaxprocs
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