From bbfb859aa8951abb92acc93fb239d44a18270ad0 Mon Sep 17 00:00:00 2001
From: lintanghui <xmutanghui@gmail.com>
Date: Fri, 25 Mar 2016 16:13:14 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0pool=20benchmark?=
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---
 chapter16/16.01.md | 47 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/chapter16/16.01.md b/chapter16/16.01.md
index 210191a..5e3d4d8 100644
--- a/chapter16/16.01.md
+++ b/chapter16/16.01.md
@@ -118,6 +118,53 @@ func (ss *ServerList) PickServer(key string) (net.Addr, error) {
 
 答案是不会的，sync.Pool的回收是有的，它是在系统自动GC的时候，触发pool.go中的poolCleanup函数。
 
+
+连接池性能测试
+
+```golang
+package main
+
+import (
+    "sync"
+    "testing"
+)
+
+var bytePool = sync.Pool{
+    New: newPool,
+}
+
+func newPool() interface{} {
+    b := make([]byte, 1024)
+    return &b
+}
+func BenchmarkAlloc(b *testing.B) {
+    for i := 0; i < b.N; i++ {
+        obj := make([]byte, 1024)
+        _ = obj
+    }
+}
+
+func BenchmarkPool(b *testing.B) {
+    for i := 0; i < b.N; i++ {
+        obj := bytePool.Get().(*[]byte)
+        _ = obj
+        bytePool.Put(obj)
+    }
+}
+```
+
+文件目录下执行 `go test -bench . `
+
+```
+E:\MyGo\sync>go test -bench .
+testing: warning: no tests to run
+PASS
+BenchmarkAlloc-4        50000000                39.3 ns/op
+BenchmarkPool-4         50000000                25.4 ns/op
+ok      _/E_/MyGo/sync  3.345s
+```
+
+通过性能测试可以清楚地看到，使用连接池消耗的CPU时间远远小于每次手动分配内存。
 ```golang
 func poolCleanup() {
 	for i, p := range allPools {