go/go-profiler-notes
1
0
Fork 0
mirror of https://github.com/DataDog/go-profiler-notes.git synced 2025-07-15 23:54:16 +02:00
Code Issues Releases Activity

align

Browse Source
This commit is contained in:
Felix Geisendörfer
2021-02-05 10:45:16 +01:00
parent 7e70b778bf
commit 155e80f1e2
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
goroutine.md
View File

@ -13,7 +13,7 @@ Despite the differences between the APIs, the [common](https://github.com/golang
In other words, goroutines that are running as well as those waiting on i/o, locks, channels, scheduling, etc. are all considered to be "active", even so one might naively not think of the latter ones as such. In other words, goroutines that are running as well as those waiting on i/o, locks, channels, scheduling, etc. are all considered to be "active", even so one might naively not think of the latter ones as such.
## Performance Impact ## Overhead
All Goroutine profiling available in Go requires an `O(N)` **stop-the-world** phase where `N` is the number of allocated goroutines. A [naive benchmark](https://github.com/felixge/fgprof/blob/fe01e87ceec08ea5024e8168f88468af8f818b62/fgprof_test.go#L35-L78) [indicates](https://github.com/felixge/fgprof/blob/master/BenchmarkProfilerGoroutines.txt) that the world is stopped for ~1µs per goroutine when using the [runtime.GoroutineProfile()](https://golang.org/pkg/runtime/#GoroutineProfile) API. But this number is likely to fluctuate in response to factors such as the average stack depth of the program, the number of dead goroutines, etc.. All Goroutine profiling available in Go requires an `O(N)` **stop-the-world** phase where `N` is the number of allocated goroutines. A [naive benchmark](https://github.com/felixge/fgprof/blob/fe01e87ceec08ea5024e8168f88468af8f818b62/fgprof_test.go#L35-L78) [indicates](https://github.com/felixge/fgprof/blob/master/BenchmarkProfilerGoroutines.txt) that the world is stopped for ~1µs per goroutine when using the [runtime.GoroutineProfile()](https://golang.org/pkg/runtime/#GoroutineProfile) API. But this number is likely to fluctuate in response to factors such as the average stack depth of the program, the number of dead goroutines, etc..