golang TCP 发起并发连接accept卡住

Question

测试用例代码如下

并发发起2000个连接会出现 accept卡死的情况

只有drawin和linux系统会有这个问题，windows正常

func TestStressConn3(t *testing.T) {
    const max = 2000
    var number = 0
    l, _ := net.Listen("tcp4", "127.0.0.1:9003")
    wg := sync.WaitGroup{}
    wg.Add(max)

    for i := 0; i < max; i++ {
        go func() {
            t.Log("start conn")
            net.Dial("tcp4", "127.0.0.1:9003")
            t.Log("end conn")
        }()
    }
    go func() {
        for {
            number++
            fmt.Println("accept", time.Now().String())
            l.Accept()
            fmt.Println("end", time.Now().String(), number)
            wg.Done()
        }
    }()
    tm := time.Now()
    wg.Wait()
    t.Log("用时", time.Now().Sub(tm).Seconds())
}

Answer 1

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