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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>
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zeripath 2022-06-18 11:04:52 +01:00 • committed by GitHub
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@ -26,6 +26,7 @@ require (
github.com/editorconfig/editorconfig-core-go/v2 v2.4.4
github.com/emirpasic/gods v1.18.1
github.com/ethantkoenig/rupture v1.0.1
github.com/felixge/fgprof v0.9.2
github.com/gliderlabs/ssh v0.3.4
github.com/go-chi/chi/v5 v5.0.7
github.com/go-chi/cors v1.2.1