golang use pprof tool

usage:

func main() {
    f, _ := os.OpenFile("cpu.pprof", os.O_CREATE|os.O_RDWR, 0644)
    defer f.Close()
    pprof.StartCPUProfile(f)
    defer pprof.StopCPUProfile()
    for i := 0; i < 5; i++ {
        fmt.Println("test")
    }
}

pprof:

go tool pprof -http=:9999 cpu.pprof