pprof

Agenda

in built profiling tool with many supported profiles:
- CPU profiles (stack sampling, where your time is being spent)
- heap (what memory is being allocated and where)
- all running goroutines and their stack
- trace, block profiles, garbage collection, etc..

Through tests and benchmarks, using the -cpuprofile and -memprofile flags. Build a profile for a benchmark:

go test -bench . (or -bench RegexBenchTest) -cpuprofile prof.cpu

Then analyze the profile:

pprof [binary] prof.cpu

import _ net/http/pprof to add /debug/pprof endpoints in your service. Start the profile and analyze the results directly:

go tool pprof -seconds 5 http://localhost:6060/debug/pprof/profile