how can I run runtime/pprof inside a go program and look at the data inside the same program?

Question

The normal way is to use:

go tool pprof

But my use case is this: I'm using a golang javascript interpreter like https://github.com/robertkrimen/otto or https://github.com/rogchap/v8go

I want to profile when I run some user supplied javascript to know if it's using too much CPU and I need to kill the go routine.

So a valid case of the javascript taking 30 seconds would be it makes an http connection and is just sitting there idle no cpu use until the connection finally finishes.

So I can't just kill anything that takes too long. I need to only kill javascript that's pegging the cpu or eating up tons of memory.

Answer 1

As Volker said it's gonna be quite involved to do so in pure go.

Perhaps you could approach the problem differently and use an other mechanism to limit the cpu/memory consumption of the js interpreter ?

You could maybe fork and make the js interpreter run in a different process. That way you could use the standard linux mechanism to control and isolate the resource consumption of a process (cgroups, nice, memory limits, docker etc...)