source: benchmark/ctxswitch/goroutine.go @ 6a9d4b4

package main

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

//=======================================
// time context switch
//=======================================

var shake chan bool = make( chan bool )

func ContextSwitch(N int) {
        start := time.Now()
        for i := 1; i <= N; i += 1 {
                runtime.Gosched()
        }
        end := time.Now()
        fmt.Printf("%d\n", end.Sub(start) / time.Duration(N))
        shake <- true   // indicate completion
}

//=======================================
// benchmark driver
//=======================================

func main() {
        const NoOfTimes = 10000000
        go ContextSwitch( NoOfTimes )           // context switch
        <- shake
}