fork(1) download 
  1. package main
  2.  
  3. import (
  4.     "time"
  5.     "fmt"
  6. )
  7.  
  8. const (
  9.     chan_size = 1000
  10.     cycle_count = 1000
  11. )
  12.  
  13. var (
  14.     v_ch = make(chan t, chan_size)
  15.     p_ch = make(chan *t, chan_size)
  16. )
  17.  
  18. type t struct {
  19.     a uint
  20.     b uint
  21. }
  22.  
  23. func fill_v() {
  24.     for i := 0; i < chan_size; i++ {
  25.         b := t{a:3, b:5}
  26.         v_ch <- b
  27.     }
  28. }
  29.  
  30. func fill_p() {
  31.     for i := 0; i < chan_size; i++ {
  32.         b := t{a:3, b:5}
  33.         p_ch <- &b
  34.     }
  35. }
  36.  
  37. func measure_f(f func()) int64 {
  38.     start := time.Now()
  39.     f();
  40.     elapsed := time.Since(start)
  41.     return elapsed.Nanoseconds()
  42. }
  43.  
  44. func main() {
  45.  
  46.     var v_nanos int64 = 0
  47.     var p_nanos int64 = 0
  48.     for i := 0; i<cycle_count; i++ {
  49.         v_nanos += measure_f(fill_v);
  50.         for i := 0; i < chan_size; i++ {
  51.             _ = <- v_ch
  52.         }
  53.     }
  54.     for i := 0; i<cycle_count; i++ {
  55.         p_nanos += measure_f(fill_p);
  56.         for i := 0; i < chan_size; i++ {
  57.             _ = <- p_ch
  58.         }
  59.     }
  60.     fmt.Println(
  61.         "v:",v_nanos/cycle_count, 
  62.         " p:", p_nanos/cycle_count, 
  63.         "ratio (v/p):", float64(v_nanos)/float64(p_nanos))
  64. }
Success #stdin #stdout 0.16s 790016KB
comments (?)
stdin 
Standard input is empty
stdout 
v: 34875  p: 59420 ratio (v/p): 0.586923845267128
https://ideone.com/vzIiTK
language:
Go (go 1.12.1)
created:
8 years ago
visibility:
public

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