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Add fgprof pprof profiler (#20005)

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fgprof is a sampling Go profiler that allows you to analyze On-CPU as
well as Off-CPU (e.g. I/O) time together.

Go's builtin sampling CPU profiler can only show On-CPU time, but it's
better than fgprof at that. Go also includes tracing profilers that can
analyze I/O, but they can't be combined with the CPU profiler.

fgprof is designed for analyzing applications with mixed I/O and CPU
workloads. This kind of profiling is also known as wall-clock profiling.

Whilst fgprof can cause significant STW latencies in applications with a
lot of goroutines (> 1-10k), these latencies only occur if the profile
is requested - it doesn't cause a delay by simply being available.

The fgprof profile is mounted on
`http://localhost:6060/debug/fgprof?seconds=3`

Signed-off-by: Andrew Thornton <art27@cantab.net>
This commit is contained in:
zeripath 2022-06-18 11:04:52 +01:00 • committed by GitHub
parent 7fbf002403
commit 90f3365d93
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3 changed files with 7 additions and 0 deletions
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2
cmd/web.go
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@ -21,6 +21,7 @@ import (
"code.gitea.io/gitea/routers"
"code.gitea.io/gitea/routers/install"
"github.com/felixge/fgprof"
"github.com/urfave/cli"
ini "gopkg.in/ini.v1"
)
@ -145,6 +146,7 @@ func runWeb(ctx *cli.Context) error {
if setting.EnablePprof {
go func() {
http.DefaultServeMux.Handle("/debug/fgprof", fgprof.Handler())
_, _, finished := process.GetManager().AddTypedContext(context.Background(), "Web: PProf Server", process.SystemProcessType, true)
log.Info("Starting pprof server on localhost:6060")
log.Info("%v", http.ListenAndServe("localhost:6060", nil))