add a pprof wrapper to simplify profiling

[vadimalekseev]

Describe Your Changes

Add a pprof wrapper to simplify running pprof with support for showing dependencies' source code.

Can be related: google/pprof#611 , golang/go#48601

Usage:

./benchmarks/pprof/pprof.sh http://localhost:9428/debug/pprof/heap

./benchmarks/pprof/pprof.sh ~/Downloads/heap.pprof

Checklist

The following checks are mandatory:

• My change adheres to VictoriaMetrics contributing guidelines.
• My change adheres to VictoriaMetrics development goals.

[vadimalekseev]

For those interested in how pprof finds the source code: https://github.com/google/pprof/blob/e611ec304b22ed2bc39c0fd534f71243962cdd8a/internal/report/source.go#L1006

[func25]

I like the script, though it might be nice for the Makefile to act as a single entry point for executing tools. Would it make sense to still keep the Makefile as the entry point and have it delegate to benchmarks/pprof/pprof.sh?

[AndrewChubatiuk]

it can be a separate makefile with debug specific targets

[vadimalekseev]

I am not sure about Makefile, because we already have the download gharchive script that is not listed in the Makefile. Let's wait for @valyala's feedback.

[valyala]

I don't like this solution, since it is very complicated and fragile. I followed an alternative path and created a pull request for pprof, which fixes all the issues with the inability to find source code for the profile - see google/pprof#977 .