| // sample program that is used to produce some of the files in |
| // pprof/internal/report/testdata. |
| package main |
| |
| import ( |
| "flag" |
| "fmt" |
| "log" |
| "math" |
| "os" |
| "runtime/pprof" |
| ) |
| |
| var cpuProfile = flag.String("cpuprofile", "", "where to write cpu profile") |
| |
| func main() { |
| flag.Parse() |
| f, err := os.Create(*cpuProfile) |
| if err != nil { |
| log.Fatal("could not create CPU profile: ", err) |
| } |
| if err := pprof.StartCPUProfile(f); err != nil { |
| log.Fatal("could not start CPU profile: ", err) |
| } |
| defer pprof.StopCPUProfile() |
| busyLoop() |
| } |
| |
| func busyLoop() { |
| m := make(map[int]int) |
| for i := 0; i < 1000000; i++ { |
| m[i] = i + 10 |
| } |
| var sum float64 |
| for i := 0; i < 100; i++ { |
| for _, v := range m { |
| sum += math.Abs(float64(v)) |
| } |
| } |
| fmt.Println("Sum", sum) |
| } |