Golang: runtime.GOMAXPROCS 的设置问题。

老哥们，我把代码中的 runtime.GOMAXPROCS(1) 注释掉了，可是程序运行下来的时间根本没减少，这是为什么？
真是百思不得骑呐

package main import ( "fmt" "time" "runtime" ) var quit chan int = make(chan int) func loop() { for i := 0; i < 10000; i++ { fmt.Printf("%d\n ", i) } quit <- 0 } func main() { fmt.Println(runtime.NumCPU()) time.Sleep(time.Second) a := 500 t1 := time.Now() runtime.GOMAXPROCS(1) //单核跑和把这句话注释吊(使用默认 CPU 个数)跑下来时间没差，这是为什么？ for i := 1; i <= a; i++ { go loop() } for i := 0; i < a; i++ { <-quit } elapsed := time.Since(t1) fmt.Println("运行时间：", elapsed) } 

// 下面是 GOMAXPROCS 的说明 // GOMAXPROCS sets the maximum number of CPUs that can be executing // simultaneously and returns the previous setting. If n < 1, it does not // change the current setting. // The number of logical CPUs on the local machine can be queried with NumCPU. // This call will go away when the scheduler improves.