}                                                                                                                                                                                                    👾[go-webapp]$  🔥 Delete compiled test, and collect benchmark data                                                                                                                                  👾[go-webapp]$ rm -v hello-go.test                                                                                                                                                                   removed 'hello-go.test'                                                                                                                                                                              👾[go-webapp]$ go test -cpuprofile cpu-refactored.prof -bench .                                                                                                                                      goos: linux                                                                                                                                                                                          goarch: amd64                                                                                                                                                                                        pkg: hello-go                                                                                                                                                                                        BenchmarkHelloServer/run_bench-2                24349323                44.3 ns/op                                                                                                                   PASS                                                                                                                                                                                                 ok      hello-go        1.317s                                                                                                                                                                       👾[go-webapp]$  🔥 show cpu profile for io.WriteString                                                                                                                                               👾[go-webapp]$ go tool pprof -list io.WriteString cpu-refactored.prof | head                                                                                                                         Total: 1.20s                                                                                                                                                                                         ROUTINE ======================== io.WriteString in /usr/lib/golang/src/io/io.go                                                                                                                           150ms      760ms (flat, cum) 63.33% of Total                                                                                                                                                             .          .    285:                                                                                                                                                                                 .          .    286:// WriteString writes the contents of the string s to w, which accepts a slice of bytes.                                                                                         .          .    287:// If w implements StringWriter, its WriteString method is invoked directly.                                                                                                     .          .    288:// Otherwise, w.Write is called exactly once.                                                                                                                                    .          .    289:func WriteString(w Writer, s string) (n int, err error) {                                                                                                                     50ms      420ms    290:   if sw, ok := w.(StringWriter); ok {                                                                                                                                       100ms      340ms    291:           return sw.WriteString(s)                                                                                                                                     👾[go-webapp]$