[post] How to use pprof in Go

[at15]

Type

• request post from @at15

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Description

Benchmark w/o profiling is not very useful, you need to know where is the bottleneck.
There are many pprof posts online. However, every time I need to use pprof I found most top ranked search result are not good enough and outdated.

This post plans to cover the following

• get profile data
  • in test using -cpuprofile
  • using http handler w/ custom route
  • dump to specific place in application code
• read profile data
  • what is cumulative
  • why the sample time is larger than actual execution time (hint: you got more than one core)
  • flamegraph (honestly I found the default svg more useful than flamegraph for simple use cases)
• internal of profile format
  • the proto
  • analysis pprof data in your own code
• pprof in other languages
  • pingcap has one in rust
  • not sure about cpp and java, google might have it?
• compare with perf
• efficient storage of pprof data
  • this is mainly for benchhub ... I want to find a low cost way for compressing and querying profile data

Update