2018-03-30 19:37
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I'm writing two services in golang that need to send to each other about 2 million messages per second. Each message is about 50 bytes, so throughput should only be about 100MB/s. I want to use tcp for this. However, results are very slow. I configured SetNoDelay(false) to make sure that data is buffered before sending, but that didn't make any difference.

I can only send about 50k messages per second, and message size doesn't matter too much, so I assume the code is blocking somewhere. Here's my test code:

package main

import "net"
import "fmt"
import "bufio"
import (

func startserver() {
    fmt.Println("Launching server...")
    ln, _ := net.Listen("tcp", ":8081")
    conn, _ := ln.Accept()

    for {
        //newmessage := strings.ToUpper(message)
        //conn.Write([]byte(newmessage + "

func startclient() {
    time.Sleep(time.Second) // so that server has time to start
    servAddr := ""
    tcpAddr, _ := net.ResolveTCPAddr("tcp", servAddr)
    conn, _ := net.DialTCP("tcp", nil, tcpAddr)
    msg := "abc
    start := time.Now()
    for i := 0; i < 1000000; i++ {
        //fmt.Print("Message from server: ", response)
    fmt.Println("took:", time.Since(start))

func main() {
    go startserver()

Any suggestion?

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1条回答 默认 最新

  • dongsheng4679 2018-03-30 20:09

    Syscalls are expensive, and writing data over loopback is very fast, so this is essentially just timing how fast you can make 1 million calls to write.

    Making lots of small reads and writes is the primary use case for using buffered io. Wrapping the normal net.TCPConn in a bufio.Writer will provide the expected performance increase.

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