runtime.go

package main

import (
	"fmt"
	"runtime"
	"time"
)

/*
	runtime包：
		runtime.NumCPU()
		runtime.GOMAXPROCS(runtime.NumCPU())

	init(),同main()，特殊的函数，由系统自动调用执行--->main goroutine

*/

func init() {
	//1.获取逻辑cpu的数量
	fmt.Println("cpuNumbers:", runtime.NumCPU())

	//2.设置go程序执行的最大的：[1,256]
	runtime.GOMAXPROCS(runtime.NumCPU())
}

func main() {
	fmt.Println("main...")

	go fun1()
	go fun2()

	time.Sleep(time.Millisecond * 10)
}

func fun1() {
	for i := 1; i <= 100; i++ {
		fmt.Println(i)
	}
}

func fun2() {
	for i := 1; i <= 100; i++ {
		fmt.Printf("\t%c\n", i)
	}
}