concurrent http s/c stress test

concur-test.go

package main

import (
        "fmt"
        "log"
        httpcli "moservice/lib/net"
        "net/http"
        "sync"
        "time"
)

const (
        port        = ":9000"
        concurrency = 10000
)

func serve() {
        http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
                time.Sleep(900 * time.Millisecond)
                fmt.Fprintf(w, "Welcome to my website!")
        })
        fmt.Println("listening on " + port)
        log.Fatal(http.ListenAndServe(port, nil))
}

func startReq() {
        var wg sync.WaitGroup
        for i := 0; i < concurrency; i++ {
                wg.Add(1)
                go req(i, &wg)
        }
        wg.Wait()
        fmt.Println("req done")
}

func req(seq int, wg *sync.WaitGroup) {
        defer wg.Done()
        url := fmt.Sprintf("http://localhost"+port+"?_=%d", seq)
        fmt.Println(url)
        _, err := httpcli.Get(url, nil)
        if err != nil {
                fmt.Println(seq, err)
                return
        }
        fmt.Println(seq, "done")
}

func main() {
        go serve()
        startReq()
}