net: add TCP benchmarks
Current results on linux_amd64, 8 HT cores @2.4GHz:
BenchmarkTCPOneShot 10000 194037 ns/op
BenchmarkTCPOneShot-2 20000 93641 ns/op
BenchmarkTCPOneShot-4 20000 94039 ns/op
BenchmarkTCPOneShot-8 20000 94667 ns/op
BenchmarkTCPOneShot-16 10000 301924 ns/op
BenchmarkTCPOneShotTimeout 10000 193264 ns/op
BenchmarkTCPOneShotTimeout-2 20000 98247 ns/op
BenchmarkTCPOneShotTimeout-4 20000 94442 ns/op
BenchmarkTCPOneShotTimeout-8 20000 95297 ns/op
BenchmarkTCPOneShotTimeout-16 10000 307970 ns/op
BenchmarkTCPPersistent 50000 52050 ns/op
BenchmarkTCPPersistent-2 100000 29452 ns/op
BenchmarkTCPPersistent-4 100000 28823 ns/op
BenchmarkTCPPersistent-8 50000 30473 ns/op
BenchmarkTCPPersistent-16 10000 311777 ns/op
BenchmarkTCPPersistentTimeout 50000 32574 ns/op
BenchmarkTCPPersistentTimeout-2 50000 29723 ns/op
BenchmarkTCPPersistentTimeout-4 100000 28592 ns/op
BenchmarkTCPPersistentTimeout-8 100000 28997 ns/op
BenchmarkTCPPersistentTimeout-16 10000 314354 ns/op
R=golang-dev, alex.brainman, dave, mikioh.mikioh, r, iant, bradfitz, iant
CC=golang-dev
https://golang.org/cl/6458128
diff --git a/src/pkg/net/tcp_test.go b/src/pkg/net/tcp_test.go
new file mode 100644
index 0000000..53daf5b
--- /dev/null
+++ b/src/pkg/net/tcp_test.go
@@ -0,0 +1,118 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package net
+
+import (
+ "runtime"
+ "testing"
+ "time"
+)
+
+func BenchmarkTCPOneShot(b *testing.B) {
+ benchmarkTCP(b, false, false)
+}
+
+func BenchmarkTCPOneShotTimeout(b *testing.B) {
+ benchmarkTCP(b, false, true)
+}
+
+func BenchmarkTCPPersistent(b *testing.B) {
+ benchmarkTCP(b, true, false)
+}
+
+func BenchmarkTCPPersistentTimeout(b *testing.B) {
+ benchmarkTCP(b, true, true)
+}
+
+func benchmarkTCP(b *testing.B, persistent, timeout bool) {
+ const msgLen = 512
+ conns := b.N
+ numConcurrent := runtime.GOMAXPROCS(-1) * 16
+ msgs := 1
+ if persistent {
+ conns = numConcurrent
+ msgs = b.N / conns
+ if msgs == 0 {
+ msgs = 1
+ }
+ if conns > b.N {
+ conns = b.N
+ }
+ }
+ sendMsg := func(c Conn, buf []byte) bool {
+ n, err := c.Write(buf)
+ if n != len(buf) || err != nil {
+ b.Logf("Write failed: %v", err)
+ return false
+ }
+ return true
+ }
+ recvMsg := func(c Conn, buf []byte) bool {
+ for read := 0; read != len(buf); {
+ n, err := c.Read(buf)
+ read += n
+ if err != nil {
+ b.Logf("Read failed: %v", err)
+ return false
+ }
+ }
+ return true
+ }
+ ln, err := Listen("tcp", "127.0.0.1:0")
+ if err != nil {
+ b.Fatalf("Listen failed: %v", err)
+ }
+ defer ln.Close()
+ // Acceptor.
+ go func() {
+ for {
+ c, err := ln.Accept()
+ if err != nil {
+ break
+ }
+ // Server connection.
+ go func(c Conn) {
+ defer c.Close()
+ if timeout {
+ c.SetDeadline(time.Now().Add(time.Hour)) // Not intended to fire.
+ }
+ var buf [msgLen]byte
+ for m := 0; m < msgs; m++ {
+ if !recvMsg(c, buf[:]) || !sendMsg(c, buf[:]) {
+ break
+ }
+ }
+ }(c)
+ }
+ }()
+ sem := make(chan bool, numConcurrent)
+ for i := 0; i < conns; i++ {
+ sem <- true
+ // Client connection.
+ go func() {
+ defer func() {
+ <-sem
+ }()
+ c, err := Dial("tcp", ln.Addr().String())
+ if err != nil {
+ b.Logf("Dial failed: %v", err)
+ return
+ }
+ defer c.Close()
+ if timeout {
+ c.SetDeadline(time.Now().Add(time.Hour)) // Not intended to fire.
+ }
+ var buf [msgLen]byte
+ for m := 0; m < msgs; m++ {
+ if !sendMsg(c, buf[:]) || !recvMsg(c, buf[:]) {
+ break
+ }
+ }
+ }()
+ }
+ for i := 0; i < cap(sem); i++ {
+ sem <- true
+ }
+}
