GOでマルチコアを使い切ってみる

multicore.go

package main

import "fmt"

var from int = 1
var to int = 1000 / 4 * 100 // (1000/4コア*100)
var period int = 1000000 * 1000 // 1000倍重くする

func main() {
  ch1 := make(chan bool)
  ch2 := make(chan bool)
  ch3 := make(chan bool)
  ch4 := make(chan bool)

  go func() {
    for hoge := from; hoge < to; hoge++ {
      acc := 0
      for i := 1; i <= period; i++ {
        acc = acc + i
      }

      result := fmt.Sprintf("%d", acc)
      fmt.Println(result)
    }
    ch1 <- true
  }()

  go func() {
    for hoge := from; hoge < to; hoge++ {
      acc := 0
      for i := 1; i <= period; i++ {
        acc = acc + i
      }

      result := fmt.Sprintf("%d", acc)
      fmt.Println(result)
    }
    ch2 <- true
  }()

  go func() {
    for hoge := from; hoge < to; hoge++ {
      acc := 0
      for i := 1; i <= period; i++ {
        acc = acc + i
      }

      result := fmt.Sprintf("%d", acc)
      fmt.Println(result)
    }
    ch3 <- true
  }()

  go func() {
    for hoge := from; hoge < to; hoge++ {
      acc := 0
      for i := 1; i <= period; i++ {
        acc = acc + i
      }

      result := fmt.Sprintf("%d", acc)
      fmt.Println(result)
    }
    ch4 <- true
  }()

  <-ch1
  <-ch2
  <-ch3
  <-ch4
}