go多线程求和

以下是利用协程计算1到100亿之间的所有数的和 package main

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

var c = make(chan int)

func main() { cores := runtime.NumCPU()

start := time.Now().UnixNano()
fmt.Println(cores)
runtime.GOMAXPROCS(cores)
he := 0
max, num := 10000000000, 10
for i := 0; i < num; i++ {
    go sum((max / num) * i + 1, (max / num) * (i + 1), i)
}
for i := 0; i < num; i++ {
    he = he + <-c
}
fmt.Println("he:", he)
fmt.Println("take times is : ", (time.Now().UnixNano() - start))
//    time.Sleep(1000*time.Second)

}

func sum(min, max, number int) { s := 0 // fmt.Println("min:", min, "max:", max, "|", number) for i := min; i <= max; i++ { s = s + i } // fmt.Println(s) c <- s }