有持续时间的例行公事

Question

这段代码的目的是使用 goroutine 计算我的电脑和 google.com 之间的每个连接时间。但结果似乎错误。为什么时间一直在增加。这是怎么回事？2013/12/04 16:10:41 www.google.com 597.175072ms2013/12/04 16:10:41 www.google.com 608.161898ms2013/12/04 16:10:41 www.google.com 614.527441ms2013/12/04 16:10:41 www.google.com 620.51907ms2013/12/04 16:10:41 www.google.com 630.052257ms2013/12/04 16:10:42 www.google.com 654.539717ms2013/12/04 16:10:42 www.google.com 659.144724ms2013/12/04 16:10:42 www.google.com 1.282230659s2013/12/04 16:10:42 www.google.com 1.353469764spackage mainimport (    "log"    "net"    "net/http"    "time"    "sync")var wg sync.WaitGroupfunc main() {    url := "http://www.google.com"    for i := 0; i < 9; i++ {        wg.Add(1)        go request(url)    }    wg.Wait()}func dialTimeout(network, addr string) (net.Conn, error) {    return net.DialTimeout(network, addr, time.Duration(1*time.Second))}func request(url string) {    var t0, t1 time.Time    transport := http.Transport{        Dial: dialTimeout,    }    client := http.Client{        Transport: &transport,    }    t0 = time.Now()    _, err := client.Get(url)    t1 = time.Now()    if err != nil {        log.Println(err)    }    log.Println(url +" "+ t1.Sub(t0).String())    wg.Done()}