Using Benchmarks to Create Profile

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).