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 }