Context switch benchmark in Go

ctxswitch.go

import (
        "fmt"
        "time"
        "flag"
        "strconv"
        "runtime"
)

func worker(count int) {
        for i := 0; i != count; i++ {
                runtime.Gosched()
        }
}

func main() {
        flag.Parse()
        count, _ := strconv.Atoi(flag.Arg(0))
        count = count * 1000000 / 2

        start := time.Now()

        go worker(count)

        for i := 0; i != count; i++ {
                runtime.Gosched()
        }

        stop := time.Now()

        duration := stop.Sub(start)
        ns := duration.Nanoseconds() / int64(count)

        fmt.Printf("performed %dM context switches in %f seconds\n", count * 2 / 1000000, duration.Seconds())
        fmt.Printf("duration of one context switch: %d ns\n", ns)
        fmt.Printf("context switches per second: %fM\n", float32(1000000000 / ns) / 1000000);
}