golang 写了一个 Udp 服务端的程序，怎么改进支持多并发？

This topic created in 3857 days ago, the information mentioned may be changed or developed.

package main

import (
    "fmt"
    "net"
    "os"
    "time"
)

func main() {
    service := ":1200"
    udpAddr, err := net.ResolveUDPAddr("udp4", service)
    checkError(err)
    conn, err := net.ListenUDP("udp", udpAddr)
    checkError(err)
    for {
        handleClient(conn)
    }
}
func handleClient(conn *net.UDPConn) {
    var buf [512]byte
    _, addr, err := conn.ReadFromUDP(buf[0:])
    if err != nil {
        return
    }
    daytime := time.Now().String()
    conn.WriteToUDP([]byte(daytime), addr)
}
func checkError(err error) {
    if err != nil {
        fmt.Fprintf(os.Stderr, "Fatal error ", err.Error())
        os.Exit(1)
    }
}

试着用 go 关键字

for {
        go handleClient(conn)
    }

引起系统 load average 过高到 400 over. 同时 client 只能响应一个请求。

3 replies • 2015-10-19 20:33:41 +08:00

1

sakeven

Oct 19, 2015 via iPhone

go handleclient

2

jjjabc

Oct 19, 2015

main 里面不要用 go ，在 handleClient 里面用
func handleClient(conn *net.UDPConn) {
var buf [512]byte
_, addr, err := conn.ReadFromUDP(buf[0:])
if err != nil {
return
}
go {
daytime := time.Now().String()
conn.WriteToUDP([]byte(daytime), addr)
}
}

3

jjjabc

Oct 19, 2015

回复能用 Markdown ？
```
func handleClient(conn *net.UDPConn) {
var buf [512]byte
_, addr, err := conn.ReadFromUDP(buf[0:])
if err != nil {
return
}
go {
daytime := time.Now().String()
conn.WriteToUDP([]byte(daytime), addr)
}
}
```