I try to implement a golang tcp server, and I found the concurrency is
satisfied for me, but the CPU usage is too high(concurrency is 15W+/s, but
the CPU usage is about 800% in a 24 cores linux machine). At the same time,
a C++ tcp server is only about 200% usage with a similar concurrency(with
libevent).
The following code is the demo of golang:
func main() {
listen, err := net.Listen("tcp", "0.0.0.0:17379")
if err != nil {
fmt.Errorf(err.Error())
}
go acceptClient(listen)
var channel2 = make(chan bool)
<-channel2}
func acceptClient(listen net.Listener) {
for {
sock, err := listen.Accept()
if err != nil {
fmt.Errorf(err.Error())
}
tcp := sock.(*net.TCPConn)
tcp.SetNoDelay(true)
var channel = make(chan bool, 10)
go read(channel, sock.(*net.TCPConn))
go write(channel, sock.(*net.TCPConn))
}}
func read(channel chan bool, sock *net.TCPConn) {
count := 0
for {
var buf = make([]byte, 1024)
n, err := sock.Read(buf)
if err != nil {
close(channel)
sock.CloseRead()
return
}
count += n
x := count / 58
count = count % 58
for i := 0; i < x; i++ {
channel <- true
}
}}
func write(channel chan bool, sock *net.TCPConn) {
buf := []byte("+OK\r\n")
defer func() {
sock.CloseWrite()
recover()
}()
for {
_, ok := <-channel
if !ok {
return
}
_, writeError := sock.Write(buf)
if writeError != nil {
return
}
}}
And I test this tcp server by the redis-benchmark with multi-clients:
redis-benchmark -h 10.100.45.2 -p 17379 -n 1000 -q script load
"redis.call('set','aaa','aaa')"
I also analyzed my golang code by the pprof, it is said CPU cost a lot of time
on syscall:
<https://lh3.googleusercontent.com/-Xe7U4uSDwK8/Wjc25XRiF5I/AAAAAAAAAAc/ImuGGSAShmkVHEt2f-eTr2KO_OjunZuCQCLcBGAs/s1600/%25E6%2580%25A7%25E8%2583%25BD%25E5%25AE%259E%25E4%25BE%258B.png>
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