Go Profiling using go tool pprof Using Benchmarks to Create Profile
Example
For a non-main packages as well as main, instead of adding flags inside the code, write benchmarks in the test package , for example:
func BenchmarkHello(b *testing.B) {
for i := 0; i < b.N; i++ {
fmt.Sprintf("hello")
}
}
Then run the test with the profile flag
go test -cpuprofile cpu.prof -bench=.
And the benchmarks will be run and create a prof file with filename cpu.prof (in the above example).
