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Felix Geisendörfer
2021-02-08 15:13:20 +01:00
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goroutine.md
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@ -2,6 +2,21 @@ This document was last updated for `go1.15.6` but probably still applies to olde
# Goroutine Profiling in Go
- [Goroutine Profiling in Go](#goroutine-profiling-in-go)
* [Description](#description)
* [Overhead](#overhead)
* [Goroutine Properties](#goroutine-properties)
* [APIs](#apis)
+ [[`runtime.Stack()`](https://golang.org/pkg/runtime/#Stack) / [`pprof.Lookup(debug=2)`](https://golang.org/pkg/runtime/pprof/#Lookup)](#--runtimestack-----https---golangorg-pkg-runtime--stack-------pproflookup-debug-2----https---golangorg-pkg-runtime-pprof--lookup-)
+ [[`pprof.Lookup(debug=1)`](https://golang.org/pkg/runtime/pprof/#Lookup)](#--pproflookup-debug-1----https---golangorg-pkg-runtime-pprof--lookup-)
+ [[`pprof.Lookup(debug=0)`](https://golang.org/pkg/runtime/pprof/#Lookup)](#--pproflookup-debug-0----https---golangorg-pkg-runtime-pprof--lookup-)
+ [[`runtime.GoroutineProfile()`](https://golang.org/pkg/runtime/#GoroutineProfile)](#--runtimegoroutineprofile-----https---golangorg-pkg-runtime--goroutineprofile-)
+ [[`net/http/pprof`](https://golang.org/pkg/net/http/pprof/)](#--net-http-pprof---https---golangorg-pkg-net-http-pprof--)
* [History](#history)
* [Disclaimers](#disclaimers)
## Description
The Go runtime keeps track of all goroutines in a simple slice called [allgs](https://github.com/golang/go/blob/3a778ff50f7091b8a64875c8ed95bfaacf3d334c/src/runtime/proc.go#L500). It contains both active and dead goroutines. The latter are kept around for reuse when new goroutines are spawned.
Go has various APIs to inspect the active goroutines in `allgs` along with their current stack trace, as well as various other properties. Some APIs expose this information as statistical summaries, while other APIs provide information for each individual goroutine.