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connecion_test.go
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connecion_test.go
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package main
import (
"io"
"net"
"testing"
)
const packetSize = 16
func connectToServer(t testing.TB) net.Conn {
ln, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
t.Fatalf("Failed to listen: %v", err)
}
go acceptLoop(t, ln)
conn, err := net.Dial("tcp", ln.Addr().String())
if err != nil {
t.Fatalf("net.Dial failed: %v", err)
}
return conn
}
func acceptLoop(t testing.TB, ln net.Listener) {
defer ln.Close()
conn, err := ln.Accept()
if err != nil {
t.Fatalf("Accept failed: %v", err)
}
data := make([]byte, packetSize)
for {
if readBytes(t, conn, data) {
return
}
if readBytes(t, conn, data) {
return
}
writeBytes(t, conn, data)
writeBytes(t, conn, data)
}
}
func readBytes(t testing.TB, r io.Reader, data []byte) bool {
if _, err := io.ReadFull(r, data); err != nil {
if err == io.EOF {
return true
}
t.Fatalf("Failed to read data: %v", err)
}
return false
}
func writeBytes(t testing.TB, w io.Writer, data []byte) {
if _, err := w.Write(data); err != nil {
t.Fatalf("Failed to write data: %v", err)
}
}
// BenchmarkConnectionRoundtrip measures the latency for sending a packet and getting a response.
// The caller writes 2 packets with packetSize, the receiver reads these packets and immediately
// sends them back. There is no work performed on the reciever.
// There is no memory allocated during the send/receive.
func BenchmarkConnectionRoundtripSerial(b *testing.B) {
conn := connectToServer(b)
defer conn.Close()
bs := make([]byte, packetSize)
bs[0] = 1
bs[packetSize-1] = 2
b.ResetTimer()
for i := 0; i < b.N; i++ {
writeBytes(b, conn, bs)
writeBytes(b, conn, bs)
readBytes(b, conn, bs)
readBytes(b, conn, bs)
}
}
func benchmarkConnectionRoundtripParallel(b *testing.B, parallelism int) {
b.SetParallelism(parallelism)
b.RunParallel(func(pb *testing.PB) {
conn := connectToServer(b)
defer conn.Close()
bs := make([]byte, packetSize)
bs[0] = 1
bs[packetSize-1] = 2
for pb.Next() {
writeBytes(b, conn, bs)
writeBytes(b, conn, bs)
readBytes(b, conn, bs)
readBytes(b, conn, bs)
}
})
}
func BenchmarkConnectionRoundtripParallel1(b *testing.B) {
benchmarkConnectionRoundtripParallel(b, 1)
}
func BenchmarkConnectionRoundtripParallel2(b *testing.B) {
benchmarkConnectionRoundtripParallel(b, 2)
}
func BenchmarkConnectionRoundtripParallel4(b *testing.B) {
benchmarkConnectionRoundtripParallel(b, 4)
}
func BenchmarkConnectionRoundtripParallel8(b *testing.B) {
benchmarkConnectionRoundtripParallel(b, 8)
}