gopl-zh.github.com/ch11/ch11-04.html

2133 lines
70 KiB
HTML
Raw Normal View History

2015-12-09 07:57:17 +00:00
<!DOCTYPE HTML>
<html lang="zh-tw" >
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<title>基準測試 | Go编程语言</title>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<meta name="description" content="">
<meta name="generator" content="GitBook 2.5.2">
<meta name="HandheldFriendly" content="true"/>
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<link rel="apple-touch-icon-precomposed" sizes="152x152" href="../gitbook/images/apple-touch-icon-precomposed-152.png">
<link rel="shortcut icon" href="../gitbook/images/favicon.ico" type="image/x-icon">
<link rel="stylesheet" href="../gitbook/style.css">
2015-12-28 08:08:26 +00:00
<link rel="stylesheet" href="../gitbook/plugins/gitbook-plugin-katex/katex.min.css">
2015-12-09 07:57:17 +00:00
<link rel="stylesheet" href="../gitbook/plugins/gitbook-plugin-highlight/website.css">
<link rel="stylesheet" href="../gitbook/plugins/gitbook-plugin-fontsettings/website.css">
<link rel="next" href="../ch11/ch11-05.html" />
<link rel="prev" href="../ch11/ch11-03.html" />
</head>
<body>
2015-12-28 08:08:26 +00:00
<div class="book" data-level="11.4" data-chapter-title="基準測試" data-filepath="ch11/ch11-04.md" data-basepath=".." data-revision="Mon Dec 28 2015 16:03:52 GMT+0800 (中国标准时间)">
2015-12-09 07:57:17 +00:00
<div class="book-summary">
<nav role="navigation">
<ul class="summary">
<li class="chapter " data-level="0" data-path="index.html">
<a href="../index.html">
<i class="fa fa-check"></i>
前言
</a>
<ul class="articles">
<li class="chapter " data-level="0.1" data-path="ch0/ch0-01.html">
<a href="../ch0/ch0-01.html">
<i class="fa fa-check"></i>
<b>0.1.</b>
Go語言起源
</a>
</li>
<li class="chapter " data-level="0.2" data-path="ch0/ch0-02.html">
<a href="../ch0/ch0-02.html">
<i class="fa fa-check"></i>
<b>0.2.</b>
Go語言項目
</a>
</li>
<li class="chapter " data-level="0.3" data-path="ch0/ch0-03.html">
<a href="../ch0/ch0-03.html">
<i class="fa fa-check"></i>
<b>0.3.</b>
本書的組織
</a>
</li>
<li class="chapter " data-level="0.4" data-path="ch0/ch0-04.html">
<a href="../ch0/ch0-04.html">
<i class="fa fa-check"></i>
<b>0.4.</b>
更多的信息
</a>
</li>
<li class="chapter " data-level="0.5" data-path="ch0/ch0-05.html">
<a href="../ch0/ch0-05.html">
<i class="fa fa-check"></i>
<b>0.5.</b>
2015-12-21 04:55:18 +00:00
致謝
2015-12-09 07:57:17 +00:00
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="1" data-path="ch1/ch1.html">
<a href="../ch1/ch1.html">
<i class="fa fa-check"></i>
<b>1.</b>
入門
</a>
<ul class="articles">
<li class="chapter " data-level="1.1" data-path="ch1/ch1-01.html">
<a href="../ch1/ch1-01.html">
<i class="fa fa-check"></i>
<b>1.1.</b>
Hello, World
</a>
</li>
<li class="chapter " data-level="1.2" data-path="ch1/ch1-02.html">
<a href="../ch1/ch1-02.html">
<i class="fa fa-check"></i>
<b>1.2.</b>
命令行參數
</a>
</li>
<li class="chapter " data-level="1.3" data-path="ch1/ch1-03.html">
<a href="../ch1/ch1-03.html">
<i class="fa fa-check"></i>
<b>1.3.</b>
2015-12-21 04:55:18 +00:00
査找重複的行
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="1.4" data-path="ch1/ch1-04.html">
<a href="../ch1/ch1-04.html">
<i class="fa fa-check"></i>
<b>1.4.</b>
2015-12-21 04:55:18 +00:00
GIF動畵
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="1.5" data-path="ch1/ch1-05.html">
<a href="../ch1/ch1-05.html">
<i class="fa fa-check"></i>
<b>1.5.</b>
2015-12-28 08:08:26 +00:00
獲取URL
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="1.6" data-path="ch1/ch1-06.html">
<a href="../ch1/ch1-06.html">
<i class="fa fa-check"></i>
<b>1.6.</b>
2015-12-28 08:08:26 +00:00
併發獲取多個URL
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="1.7" data-path="ch1/ch1-07.html">
<a href="../ch1/ch1-07.html">
<i class="fa fa-check"></i>
<b>1.7.</b>
Web服務
</a>
</li>
<li class="chapter " data-level="1.8" data-path="ch1/ch1-08.html">
<a href="../ch1/ch1-08.html">
<i class="fa fa-check"></i>
<b>1.8.</b>
本章要點
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="2" data-path="ch2/ch2.html">
<a href="../ch2/ch2.html">
<i class="fa fa-check"></i>
<b>2.</b>
程序結構
</a>
<ul class="articles">
<li class="chapter " data-level="2.1" data-path="ch2/ch2-01.html">
<a href="../ch2/ch2-01.html">
<i class="fa fa-check"></i>
<b>2.1.</b>
命名
</a>
</li>
<li class="chapter " data-level="2.2" data-path="ch2/ch2-02.html">
<a href="../ch2/ch2-02.html">
<i class="fa fa-check"></i>
<b>2.2.</b>
聲明
</a>
</li>
<li class="chapter " data-level="2.3" data-path="ch2/ch2-03.html">
<a href="../ch2/ch2-03.html">
<i class="fa fa-check"></i>
<b>2.3.</b>
變量
</a>
</li>
<li class="chapter " data-level="2.4" data-path="ch2/ch2-04.html">
<a href="../ch2/ch2-04.html">
<i class="fa fa-check"></i>
<b>2.4.</b>
賦值
</a>
</li>
<li class="chapter " data-level="2.5" data-path="ch2/ch2-05.html">
<a href="../ch2/ch2-05.html">
<i class="fa fa-check"></i>
<b>2.5.</b>
類型
</a>
</li>
<li class="chapter " data-level="2.6" data-path="ch2/ch2-06.html">
<a href="../ch2/ch2-06.html">
<i class="fa fa-check"></i>
<b>2.6.</b>
包和文件
</a>
</li>
<li class="chapter " data-level="2.7" data-path="ch2/ch2-07.html">
<a href="../ch2/ch2-07.html">
<i class="fa fa-check"></i>
<b>2.7.</b>
作用域
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="3" data-path="ch3/ch3.html">
<a href="../ch3/ch3.html">
<i class="fa fa-check"></i>
<b>3.</b>
基礎數據類型
</a>
<ul class="articles">
<li class="chapter " data-level="3.1" data-path="ch3/ch3-01.html">
<a href="../ch3/ch3-01.html">
<i class="fa fa-check"></i>
<b>3.1.</b>
整型
</a>
</li>
<li class="chapter " data-level="3.2" data-path="ch3/ch3-02.html">
<a href="../ch3/ch3-02.html">
<i class="fa fa-check"></i>
<b>3.2.</b>
浮點數
</a>
</li>
<li class="chapter " data-level="3.3" data-path="ch3/ch3-03.html">
<a href="../ch3/ch3-03.html">
<i class="fa fa-check"></i>
<b>3.3.</b>
2015-12-21 04:55:18 +00:00
複數
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="3.4" data-path="ch3/ch3-04.html">
<a href="../ch3/ch3-04.html">
<i class="fa fa-check"></i>
<b>3.4.</b>
2015-12-21 04:55:18 +00:00
布爾型
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="3.5" data-path="ch3/ch3-05.html">
<a href="../ch3/ch3-05.html">
<i class="fa fa-check"></i>
<b>3.5.</b>
字符串
</a>
</li>
<li class="chapter " data-level="3.6" data-path="ch3/ch3-06.html">
<a href="../ch3/ch3-06.html">
<i class="fa fa-check"></i>
<b>3.6.</b>
常量
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="4" data-path="ch4/ch4.html">
<a href="../ch4/ch4.html">
<i class="fa fa-check"></i>
<b>4.</b>
2015-12-21 04:55:18 +00:00
複合數據類型
2015-12-09 07:57:17 +00:00
</a>
<ul class="articles">
<li class="chapter " data-level="4.1" data-path="ch4/ch4-01.html">
<a href="../ch4/ch4-01.html">
<i class="fa fa-check"></i>
<b>4.1.</b>
數組
</a>
</li>
<li class="chapter " data-level="4.2" data-path="ch4/ch4-02.html">
<a href="../ch4/ch4-02.html">
<i class="fa fa-check"></i>
<b>4.2.</b>
切片
</a>
</li>
<li class="chapter " data-level="4.3" data-path="ch4/ch4-03.html">
<a href="../ch4/ch4-03.html">
<i class="fa fa-check"></i>
<b>4.3.</b>
字典
</a>
</li>
<li class="chapter " data-level="4.4" data-path="ch4/ch4-04.html">
<a href="../ch4/ch4-04.html">
<i class="fa fa-check"></i>
<b>4.4.</b>
結構體
</a>
</li>
<li class="chapter " data-level="4.5" data-path="ch4/ch4-05.html">
<a href="../ch4/ch4-05.html">
<i class="fa fa-check"></i>
<b>4.5.</b>
JSON
</a>
</li>
<li class="chapter " data-level="4.6" data-path="ch4/ch4-06.html">
<a href="../ch4/ch4-06.html">
<i class="fa fa-check"></i>
<b>4.6.</b>
文本和HTML模闆
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="5" data-path="ch5/ch5.html">
<a href="../ch5/ch5.html">
<i class="fa fa-check"></i>
<b>5.</b>
函數
</a>
<ul class="articles">
<li class="chapter " data-level="5.1" data-path="ch5/ch5-01.html">
<a href="../ch5/ch5-01.html">
<i class="fa fa-check"></i>
<b>5.1.</b>
函數聲明
</a>
</li>
<li class="chapter " data-level="5.2" data-path="ch5/ch5-02.html">
<a href="../ch5/ch5-02.html">
<i class="fa fa-check"></i>
<b>5.2.</b>
遞歸
</a>
</li>
<li class="chapter " data-level="5.3" data-path="ch5/ch5-03.html">
<a href="../ch5/ch5-03.html">
<i class="fa fa-check"></i>
<b>5.3.</b>
多返迴值
</a>
</li>
<li class="chapter " data-level="5.4" data-path="ch5/ch5-04.html">
<a href="../ch5/ch5-04.html">
<i class="fa fa-check"></i>
<b>5.4.</b>
錯誤
</a>
</li>
<li class="chapter " data-level="5.5" data-path="ch5/ch5-05.html">
<a href="../ch5/ch5-05.html">
<i class="fa fa-check"></i>
<b>5.5.</b>
函數值
</a>
</li>
<li class="chapter " data-level="5.6" data-path="ch5/ch5-06.html">
<a href="../ch5/ch5-06.html">
<i class="fa fa-check"></i>
<b>5.6.</b>
匿名函數
</a>
</li>
<li class="chapter " data-level="5.7" data-path="ch5/ch5-07.html">
<a href="../ch5/ch5-07.html">
<i class="fa fa-check"></i>
<b>5.7.</b>
可變參數
</a>
</li>
<li class="chapter " data-level="5.8" data-path="ch5/ch5-08.html">
<a href="../ch5/ch5-08.html">
<i class="fa fa-check"></i>
<b>5.8.</b>
Deferred函數
</a>
</li>
<li class="chapter " data-level="5.9" data-path="ch5/ch5-09.html">
<a href="../ch5/ch5-09.html">
<i class="fa fa-check"></i>
<b>5.9.</b>
Panic異常
</a>
</li>
<li class="chapter " data-level="5.10" data-path="ch5/ch5-10.html">
<a href="../ch5/ch5-10.html">
<i class="fa fa-check"></i>
<b>5.10.</b>
2015-12-28 08:08:26 +00:00
Recover捕獲異常
2015-12-09 07:57:17 +00:00
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="6" data-path="ch6/ch6.html">
<a href="../ch6/ch6.html">
<i class="fa fa-check"></i>
<b>6.</b>
方法
</a>
<ul class="articles">
<li class="chapter " data-level="6.1" data-path="ch6/ch6-01.html">
<a href="../ch6/ch6-01.html">
<i class="fa fa-check"></i>
<b>6.1.</b>
方法聲明
</a>
</li>
<li class="chapter " data-level="6.2" data-path="ch6/ch6-02.html">
<a href="../ch6/ch6-02.html">
<i class="fa fa-check"></i>
<b>6.2.</b>
2015-12-21 04:55:18 +00:00
基於指針對象的方法
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="6.3" data-path="ch6/ch6-03.html">
<a href="../ch6/ch6-03.html">
<i class="fa fa-check"></i>
<b>6.3.</b>
通過嵌入結構體來擴展類型
</a>
</li>
<li class="chapter " data-level="6.4" data-path="ch6/ch6-04.html">
<a href="../ch6/ch6-04.html">
<i class="fa fa-check"></i>
<b>6.4.</b>
2015-12-21 04:55:18 +00:00
方法值和方法表達式
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="6.5" data-path="ch6/ch6-05.html">
<a href="../ch6/ch6-05.html">
<i class="fa fa-check"></i>
<b>6.5.</b>
示例: Bit數組
</a>
</li>
<li class="chapter " data-level="6.6" data-path="ch6/ch6-06.html">
<a href="../ch6/ch6-06.html">
<i class="fa fa-check"></i>
<b>6.6.</b>
封裝
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="7" data-path="ch7/ch7.html">
<a href="../ch7/ch7.html">
<i class="fa fa-check"></i>
<b>7.</b>
接口
</a>
<ul class="articles">
<li class="chapter " data-level="7.1" data-path="ch7/ch7-01.html">
<a href="../ch7/ch7-01.html">
<i class="fa fa-check"></i>
<b>7.1.</b>
2015-12-21 04:55:18 +00:00
接口是合約
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="7.2" data-path="ch7/ch7-02.html">
<a href="../ch7/ch7-02.html">
<i class="fa fa-check"></i>
<b>7.2.</b>
接口類型
</a>
</li>
<li class="chapter " data-level="7.3" data-path="ch7/ch7-03.html">
<a href="../ch7/ch7-03.html">
<i class="fa fa-check"></i>
<b>7.3.</b>
實現接口的條件
</a>
</li>
<li class="chapter " data-level="7.4" data-path="ch7/ch7-04.html">
<a href="../ch7/ch7-04.html">
<i class="fa fa-check"></i>
<b>7.4.</b>
flag.Value接口
</a>
</li>
<li class="chapter " data-level="7.5" data-path="ch7/ch7-05.html">
<a href="../ch7/ch7-05.html">
<i class="fa fa-check"></i>
<b>7.5.</b>
接口值
</a>
</li>
<li class="chapter " data-level="7.6" data-path="ch7/ch7-06.html">
<a href="../ch7/ch7-06.html">
<i class="fa fa-check"></i>
<b>7.6.</b>
sort.Interface接口
</a>
</li>
<li class="chapter " data-level="7.7" data-path="ch7/ch7-07.html">
<a href="../ch7/ch7-07.html">
<i class="fa fa-check"></i>
<b>7.7.</b>
http.Handler接口
</a>
</li>
<li class="chapter " data-level="7.8" data-path="ch7/ch7-08.html">
<a href="../ch7/ch7-08.html">
<i class="fa fa-check"></i>
<b>7.8.</b>
error接口
</a>
</li>
<li class="chapter " data-level="7.9" data-path="ch7/ch7-09.html">
<a href="../ch7/ch7-09.html">
<i class="fa fa-check"></i>
<b>7.9.</b>
2015-12-21 04:55:18 +00:00
示例: 表達式求值
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="7.10" data-path="ch7/ch7-10.html">
<a href="../ch7/ch7-10.html">
<i class="fa fa-check"></i>
<b>7.10.</b>
類型斷言
</a>
</li>
<li class="chapter " data-level="7.11" data-path="ch7/ch7-11.html">
<a href="../ch7/ch7-11.html">
<i class="fa fa-check"></i>
<b>7.11.</b>
2015-12-21 04:55:18 +00:00
基於類型斷言識别錯誤類型
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="7.12" data-path="ch7/ch7-12.html">
<a href="../ch7/ch7-12.html">
<i class="fa fa-check"></i>
<b>7.12.</b>
通過類型斷言査詢接口
</a>
</li>
<li class="chapter " data-level="7.13" data-path="ch7/ch7-13.html">
<a href="../ch7/ch7-13.html">
<i class="fa fa-check"></i>
<b>7.13.</b>
類型分支
</a>
</li>
<li class="chapter " data-level="7.14" data-path="ch7/ch7-14.html">
<a href="../ch7/ch7-14.html">
<i class="fa fa-check"></i>
<b>7.14.</b>
示例: 基於標記的XML解碼
</a>
</li>
<li class="chapter " data-level="7.15" data-path="ch7/ch7-15.html">
<a href="../ch7/ch7-15.html">
<i class="fa fa-check"></i>
<b>7.15.</b>
補充幾點
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="8" data-path="ch8/ch8.html">
<a href="../ch8/ch8.html">
<i class="fa fa-check"></i>
<b>8.</b>
Goroutines和Channels
</a>
<ul class="articles">
<li class="chapter " data-level="8.1" data-path="ch8/ch8-01.html">
<a href="../ch8/ch8-01.html">
<i class="fa fa-check"></i>
<b>8.1.</b>
Goroutines
</a>
</li>
<li class="chapter " data-level="8.2" data-path="ch8/ch8-02.html">
<a href="../ch8/ch8-02.html">
<i class="fa fa-check"></i>
<b>8.2.</b>
2015-12-21 04:55:18 +00:00
示例: 併發的Clock服務
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="8.3" data-path="ch8/ch8-03.html">
<a href="../ch8/ch8-03.html">
<i class="fa fa-check"></i>
<b>8.3.</b>
2015-12-21 04:55:18 +00:00
示例: 併發的Echo服務
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="8.4" data-path="ch8/ch8-04.html">
<a href="../ch8/ch8-04.html">
<i class="fa fa-check"></i>
<b>8.4.</b>
Channels
</a>
</li>
<li class="chapter " data-level="8.5" data-path="ch8/ch8-05.html">
<a href="../ch8/ch8-05.html">
<i class="fa fa-check"></i>
<b>8.5.</b>
併行的循環
</a>
</li>
<li class="chapter " data-level="8.6" data-path="ch8/ch8-06.html">
<a href="../ch8/ch8-06.html">
<i class="fa fa-check"></i>
<b>8.6.</b>
2015-12-21 04:55:18 +00:00
示例: 併發的Web爬蟲
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="8.7" data-path="ch8/ch8-07.html">
<a href="../ch8/ch8-07.html">
<i class="fa fa-check"></i>
<b>8.7.</b>
2015-12-21 04:55:18 +00:00
基於select的多路複用
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="8.8" data-path="ch8/ch8-08.html">
<a href="../ch8/ch8-08.html">
<i class="fa fa-check"></i>
<b>8.8.</b>
2015-12-21 04:55:18 +00:00
示例: 併發的字典遍歷
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="8.9" data-path="ch8/ch8-09.html">
<a href="../ch8/ch8-09.html">
<i class="fa fa-check"></i>
<b>8.9.</b>
2015-12-28 08:08:26 +00:00
併發的退出
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="8.10" data-path="ch8/ch8-10.html">
<a href="../ch8/ch8-10.html">
<i class="fa fa-check"></i>
<b>8.10.</b>
示例: 聊天服務
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="9" data-path="ch9/ch9.html">
<a href="../ch9/ch9.html">
<i class="fa fa-check"></i>
<b>9.</b>
2015-12-21 04:55:18 +00:00
基於共享變量的併發
2015-12-09 07:57:17 +00:00
</a>
<ul class="articles">
<li class="chapter " data-level="9.1" data-path="ch9/ch9-01.html">
<a href="../ch9/ch9-01.html">
<i class="fa fa-check"></i>
<b>9.1.</b>
競爭條件
</a>
</li>
<li class="chapter " data-level="9.2" data-path="ch9/ch9-02.html">
<a href="../ch9/ch9-02.html">
<i class="fa fa-check"></i>
<b>9.2.</b>
sync.Mutex互斥鎖
</a>
</li>
<li class="chapter " data-level="9.3" data-path="ch9/ch9-03.html">
<a href="../ch9/ch9-03.html">
<i class="fa fa-check"></i>
<b>9.3.</b>
sync.RWMutex讀寫鎖
</a>
</li>
<li class="chapter " data-level="9.4" data-path="ch9/ch9-04.html">
<a href="../ch9/ch9-04.html">
<i class="fa fa-check"></i>
<b>9.4.</b>
2015-12-21 04:55:18 +00:00
內存同步
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="9.5" data-path="ch9/ch9-05.html">
<a href="../ch9/ch9-05.html">
<i class="fa fa-check"></i>
<b>9.5.</b>
sync.Once初始化
</a>
</li>
<li class="chapter " data-level="9.6" data-path="ch9/ch9-06.html">
<a href="../ch9/ch9-06.html">
<i class="fa fa-check"></i>
<b>9.6.</b>
競爭條件檢測
</a>
</li>
<li class="chapter " data-level="9.7" data-path="ch9/ch9-07.html">
<a href="../ch9/ch9-07.html">
<i class="fa fa-check"></i>
<b>9.7.</b>
2015-12-21 04:55:18 +00:00
示例: 併發的非阻塞緩存
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="9.8" data-path="ch9/ch9-08.html">
<a href="../ch9/ch9-08.html">
<i class="fa fa-check"></i>
<b>9.8.</b>
2015-12-21 04:55:18 +00:00
Goroutines和線程
2015-12-09 07:57:17 +00:00
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="10" data-path="ch10/ch10.html">
<a href="../ch10/ch10.html">
<i class="fa fa-check"></i>
<b>10.</b>
包和工具
</a>
<ul class="articles">
<li class="chapter " data-level="10.1" data-path="ch10/ch10-01.html">
<a href="../ch10/ch10-01.html">
<i class="fa fa-check"></i>
<b>10.1.</b>
簡介
</a>
</li>
<li class="chapter " data-level="10.2" data-path="ch10/ch10-02.html">
<a href="../ch10/ch10-02.html">
<i class="fa fa-check"></i>
<b>10.2.</b>
導入路徑
</a>
</li>
<li class="chapter " data-level="10.3" data-path="ch10/ch10-03.html">
<a href="../ch10/ch10-03.html">
<i class="fa fa-check"></i>
<b>10.3.</b>
包聲明
</a>
</li>
<li class="chapter " data-level="10.4" data-path="ch10/ch10-04.html">
<a href="../ch10/ch10-04.html">
<i class="fa fa-check"></i>
<b>10.4.</b>
導入聲明
</a>
</li>
<li class="chapter " data-level="10.5" data-path="ch10/ch10-05.html">
<a href="../ch10/ch10-05.html">
<i class="fa fa-check"></i>
<b>10.5.</b>
匿名導入
</a>
</li>
<li class="chapter " data-level="10.6" data-path="ch10/ch10-06.html">
<a href="../ch10/ch10-06.html">
<i class="fa fa-check"></i>
<b>10.6.</b>
包和命名
</a>
</li>
<li class="chapter " data-level="10.7" data-path="ch10/ch10-07.html">
<a href="../ch10/ch10-07.html">
<i class="fa fa-check"></i>
<b>10.7.</b>
工具
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="11" data-path="ch11/ch11.html">
<a href="../ch11/ch11.html">
<i class="fa fa-check"></i>
<b>11.</b>
測試
</a>
<ul class="articles">
<li class="chapter " data-level="11.1" data-path="ch11/ch11-01.html">
<a href="../ch11/ch11-01.html">
<i class="fa fa-check"></i>
<b>11.1.</b>
go test
</a>
</li>
<li class="chapter " data-level="11.2" data-path="ch11/ch11-02.html">
<a href="../ch11/ch11-02.html">
<i class="fa fa-check"></i>
<b>11.2.</b>
測試函數
</a>
</li>
<li class="chapter " data-level="11.3" data-path="ch11/ch11-03.html">
<a href="../ch11/ch11-03.html">
<i class="fa fa-check"></i>
<b>11.3.</b>
測試覆蓋率
</a>
</li>
<li class="chapter active" data-level="11.4" data-path="ch11/ch11-04.html">
<a href="../ch11/ch11-04.html">
<i class="fa fa-check"></i>
<b>11.4.</b>
基準測試
</a>
</li>
<li class="chapter " data-level="11.5" data-path="ch11/ch11-05.html">
<a href="../ch11/ch11-05.html">
<i class="fa fa-check"></i>
<b>11.5.</b>
剖析
</a>
</li>
<li class="chapter " data-level="11.6" data-path="ch11/ch11-06.html">
<a href="../ch11/ch11-06.html">
<i class="fa fa-check"></i>
<b>11.6.</b>
示例函數
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="12" data-path="ch12/ch12.html">
<a href="../ch12/ch12.html">
<i class="fa fa-check"></i>
<b>12.</b>
反射
</a>
<ul class="articles">
<li class="chapter " data-level="12.1" data-path="ch12/ch12-01.html">
<a href="../ch12/ch12-01.html">
<i class="fa fa-check"></i>
<b>12.1.</b>
2015-12-21 04:55:18 +00:00
爲何需要反射?
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="12.2" data-path="ch12/ch12-02.html">
<a href="../ch12/ch12-02.html">
<i class="fa fa-check"></i>
<b>12.2.</b>
reflect.Type和reflect.Value
</a>
</li>
<li class="chapter " data-level="12.3" data-path="ch12/ch12-03.html">
<a href="../ch12/ch12-03.html">
<i class="fa fa-check"></i>
<b>12.3.</b>
Display遞歸打印
</a>
</li>
<li class="chapter " data-level="12.4" data-path="ch12/ch12-04.html">
<a href="../ch12/ch12-04.html">
<i class="fa fa-check"></i>
<b>12.4.</b>
2015-12-21 04:55:18 +00:00
示例: 編碼S表達式
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="12.5" data-path="ch12/ch12-05.html">
<a href="../ch12/ch12-05.html">
<i class="fa fa-check"></i>
<b>12.5.</b>
通過reflect.Value脩改值
</a>
</li>
<li class="chapter " data-level="12.6" data-path="ch12/ch12-06.html">
<a href="../ch12/ch12-06.html">
<i class="fa fa-check"></i>
<b>12.6.</b>
2015-12-21 04:55:18 +00:00
示例: 解碼S表達式
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="12.7" data-path="ch12/ch12-07.html">
<a href="../ch12/ch12-07.html">
<i class="fa fa-check"></i>
<b>12.7.</b>
2015-12-28 08:08:26 +00:00
獲取結構體字段標識
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="chapter " data-level="12.8" data-path="ch12/ch12-08.html">
<a href="../ch12/ch12-08.html">
<i class="fa fa-check"></i>
<b>12.8.</b>
顯示一個類型的方法集
</a>
</li>
<li class="chapter " data-level="12.9" data-path="ch12/ch12-09.html">
<a href="../ch12/ch12-09.html">
<i class="fa fa-check"></i>
<b>12.9.</b>
幾點忠告
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="13" data-path="ch13/ch13.html">
<a href="../ch13/ch13.html">
<i class="fa fa-check"></i>
<b>13.</b>
底層編程
</a>
<ul class="articles">
<li class="chapter " data-level="13.1" data-path="ch13/ch13-01.html">
<a href="../ch13/ch13-01.html">
<i class="fa fa-check"></i>
<b>13.1.</b>
unsafe.Sizeof, Alignof 和 Offsetof
</a>
</li>
<li class="chapter " data-level="13.2" data-path="ch13/ch13-02.html">
<a href="../ch13/ch13-02.html">
<i class="fa fa-check"></i>
<b>13.2.</b>
unsafe.Pointer
</a>
</li>
<li class="chapter " data-level="13.3" data-path="ch13/ch13-03.html">
<a href="../ch13/ch13-03.html">
<i class="fa fa-check"></i>
<b>13.3.</b>
示例: 深度相等判斷
</a>
</li>
<li class="chapter " data-level="13.4" data-path="ch13/ch13-04.html">
<a href="../ch13/ch13-04.html">
<i class="fa fa-check"></i>
<b>13.4.</b>
通過cgo調用C代碼
</a>
</li>
<li class="chapter " data-level="13.5" data-path="ch13/ch13-05.html">
<a href="../ch13/ch13-05.html">
<i class="fa fa-check"></i>
<b>13.5.</b>
幾點忠告
</a>
</li>
</ul>
</li>
2015-12-24 06:47:06 +00:00
<li class="chapter " data-level="14" data-path="CONTRIBUTORS.html">
2015-12-09 07:57:17 +00:00
2015-12-24 06:47:06 +00:00
<a href="../CONTRIBUTORS.html">
2015-12-09 07:57:17 +00:00
<i class="fa fa-check"></i>
2015-12-21 04:55:18 +00:00
<b>14.</b>
2015-12-09 07:57:17 +00:00
2015-12-24 06:47:06 +00:00
附録
2015-12-09 07:57:17 +00:00
</a>
</li>
<li class="divider"></li>
<li>
<a href="https://www.gitbook.com" target="blank" class="gitbook-link">
本書使用 GitBook 釋出
</a>
</li>
</ul>
</nav>
</div>
<div class="book-body">
<div class="body-inner">
<div class="book-header" role="navigation">
<!-- Actions Left -->
<!-- Title -->
<h1>
<i class="fa fa-circle-o-notch fa-spin"></i>
<a href="../" >Go编程语言</a>
</h1>
</div>
<div class="page-wrapper" tabindex="-1" role="main">
<div class="page-inner">
<section class="normal" id="section-">
<h2 id="114-&#x57FA;&#x6E96;&#x6E2C;&#x8A66;">11.4. &#x57FA;&#x6E96;&#x6E2C;&#x8A66;</h2>
2015-12-21 04:55:18 +00:00
<p>&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x662F;&#x6E2C;&#x91CF;&#x4E00;&#x500B;&#x7A0B;&#x5E8F;&#x5728;&#x56FA;&#x5B9A;&#x5DE5;&#x4F5C;&#x8CA0;&#x8F09;&#x4E0B;&#x7684;&#x6027;&#x80FD;. &#x5728;Go&#x8A9E;&#x8A00;&#x4E2D;, &#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x51FD;&#x6578;&#x548C;&#x666E;&#x901A;&#x6E2C;&#x8A66;&#x51FD;&#x6578;&#x985E;&#x4F3C;, &#x4F46;&#x662F;&#x4EE5;Benchmark&#x7232;&#x524D;&#x7DB4;&#x540D;, &#x4F75;&#x4E14;&#x5E36;&#x6709;&#x4E00;&#x500B; <code>*testing.B</code> &#x985E;&#x578B;&#x7684;&#x53C3;&#x6578;; <code>*testing.B</code> &#x9664;&#x4E86;&#x63D0;&#x4F9B;&#x548C; <code>*testing.T</code> &#x985E;&#x4F3C;&#x7684;&#x65B9;&#x6CD5;, &#x9084;&#x6709;&#x984D;&#x5916;&#x4E00;&#x4E9B;&#x548C;&#x6027;&#x80FD;&#x6E2C;&#x91CF;&#x76F8;&#x95DC;&#x7684;&#x65B9;&#x6CD5;. &#x5B83;&#x9084;&#x63D0;&#x4F9B;&#x4E86;&#x4E00;&#x500B;&#x6574;&#x6578;N, &#x7528;&#x65BC;&#x6307;&#x5B9A;&#x64CD;&#x4F5C;&#x57F7;&#x884C;&#x7684;&#x5FAA;&#x74B0;&#x6B21;&#x6578;.</p>
<p>&#x4E0B;&#x9762;&#x662F; IsPalindrome &#x51FD;&#x6578;&#x7684;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;, &#x5176;&#x4E2D;&#x5FAA;&#x74B0;&#x5C07;&#x57F7;&#x884C;N&#x6B21;.</p>
2015-12-14 04:08:47 +00:00
<pre><code class="lang-Go"><span class="hljs-keyword">import</span> <span class="hljs-string">&quot;testing&quot;</span>
<span class="hljs-keyword">func</span> BenchmarkIsPalindrome(b *testing.B) {
<span class="hljs-keyword">for</span> i := <span class="hljs-number">0</span>; i &lt; b.N; i++ {
IsPalindrome(<span class="hljs-string">&quot;A man, a plan, a canal: Panama&quot;</span>)
}
}
</code></pre>
2015-12-21 04:55:18 +00:00
<p>&#x6211;&#x5011;&#x7528;&#x4E0B;&#x9762;&#x7684;&#x547D;&#x4EE4;&#x904B;&#x884C;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;. &#x548C;&#x666E;&#x901A;&#x6E2C;&#x8A66;&#x4E0D;&#x540C;&#x7684;&#x662F;, &#x9ED8;&#x8A8D;&#x60C5;&#x6CC1;&#x4E0B;&#x4E0D;&#x904B;&#x884C;&#x4EFB;&#x4F55;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;. &#x6211;&#x5011;&#x9700;&#x8981;&#x901A;&#x904E; <code>-bench</code> &#x547D;&#x4EE4;&#x884C;&#x6A19;&#x8A8C;&#x53C3;&#x6578;&#x624B;&#x5DE5;&#x6307;&#x5B9A;&#x8981;&#x904B;&#x884C;&#x7684;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x51FD;&#x6578;. &#x8A72;&#x53C3;&#x6578;&#x662F;&#x4E00;&#x500B;&#x6B63;&#x5247;&#x8868;&#x9054;&#x5F0F;, &#x7528;&#x65BC;&#x5339;&#x914D;&#x8981;&#x57F7;&#x884C;&#x7684;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x51FD;&#x6578;&#x7684;&#x540D;&#x5B57;, &#x9ED8;&#x8A8D;&#x503C;&#x662F;&#x7A7A;&#x7684;. &#x5176;&#x4E2D; &#x2018;&#x2018;.&#x2019;&#x2019; &#x6A21;&#x5F0F;&#x5C07;&#x53EF;&#x4EE5;&#x5339;&#x914D;&#x6240;&#x6709;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x51FD;&#x6578;, &#x4F46;&#x662F;&#x9019;&#x91CC;&#x7E3D;&#x5171;&#x96BB;&#x6709;&#x4E00;&#x500B;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x51FD;&#x6578;, &#x56E0;&#x6B64; &#x548C; <code>-bench=IsPalindrome</code> &#x53C3;&#x6578;&#x662F;&#x7B49;&#x50F9;&#x7684;&#x6548;&#x679C;.</p>
2015-12-14 04:08:47 +00:00
<pre><code>$ cd $GOPATH/src/gopl.io/ch11/word2
$ go test -bench=.
PASS
BenchmarkIsPalindrome-8 1000000 1035 ns/op
ok gopl.io/ch11/word2 2.179s
2015-12-21 04:55:18 +00:00
</code></pre><p>&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x540D;&#x7684;&#x6578;&#x5B57;&#x5F8C;&#x7DB4;&#x90E8;&#x5206;, &#x9019;&#x91CC;&#x662F;8, &#x8868;&#x793A;&#x904B;&#x884C;&#x6642;&#x5C0D;&#x61C9;&#x7684; GOMAXPROCS &#x7684;&#x503C;, &#x9019;&#x5C0D;&#x65BC;&#x4E00;&#x4E9B;&#x548C;&#x4F75;&#x767C;&#x76F8;&#x95DC;&#x7684;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x662F;&#x91CD;&#x8981;&#x7684;&#x4FE1;&#x606F;.</p>
<p>&#x5831;&#x544A;&#x986F;&#x793A;&#x6BCF;&#x6B21;&#x8ABF;&#x7528; IsPalindrome &#x51FD;&#x6578;&#x82B1;&#x8CBB; 1.035&#x5FAE;&#x79D2;, &#x662F;&#x57F7;&#x884C; 1,000,000 &#x6B21;&#x7684;&#x5E73;&#x5747;&#x6642;&#x9593;. &#x56E0;&#x7232;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x9A45;&#x52D5;&#x5668;&#x4F75;&#x4E0D;&#x77E5;&#x9053;&#x6BCF;&#x500B;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x51FD;&#x6578;&#x904B;&#x884C;&#x6240;&#x82B1;&#x7684;&#x6642;&#x5019;, &#x5B83;&#x6703;&#x5690;&#x8A66;&#x5728;&#x771E;&#x6B63;&#x904B;&#x884C;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x524D;&#x5148;&#x5690;&#x8A66;&#x7528;&#x8F03;&#x5C0F;&#x7684; N &#x904B;&#x884C;&#x6E2C;&#x8A66;&#x4F86;&#x4F30;&#x7B97;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x51FD;&#x6578;&#x6240;&#x9700;&#x8981;&#x7684;&#x6642;&#x9593;, &#x7136;&#x5F8C;&#x63A8;&#x65B7;&#x4E00;&#x500B;&#x8F03;&#x5927;&#x7684;&#x6642;&#x9593;&#x4FDD;&#x8B49;&#x7A69;&#x5B9A;&#x7684;&#x6E2C;&#x91CF;&#x7D50;&#x679C;.</p>
<p>&#x5FAA;&#x74B0;&#x5728;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x51FD;&#x6578;&#x5167;&#x5BE6;&#x73FE;, &#x800C;&#x4E0D;&#x662F;&#x653E;&#x5728;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x6846;&#x67B6;&#x5167;&#x5BE6;&#x73FE;, &#x9019;&#x6A23;&#x53EF;&#x4EE5;&#x8B93;&#x6BCF;&#x500B;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x51FD;&#x6578;&#x6709;&#x6A5F;&#x6703;&#x5728;&#x5FAA;&#x74B0;&#x555F;&#x52D5;&#x524D;&#x57F7;&#x884C;&#x521D;&#x59CB;&#x5316;&#x4EE3;&#x78BC;, &#x9019;&#x6A23;&#x4F75;&#x4E0D;&#x6703;&#x986F;&#x8457;&#x5F71;&#x97FF;&#x6BCF;&#x6B21;&#x8FED;&#x4EE3;&#x7684;&#x5E73;&#x5747;&#x904B;&#x884C;&#x6642;&#x9593;. &#x5982;&#x679C;&#x9084;&#x662F;&#x64D4;&#x5FC3;&#x521D;&#x59CB;&#x5316;&#x4EE3;&#x78BC;&#x90E8;&#x5206;&#x5C0D;&#x6E2C;&#x91CF;&#x6642;&#x9593;&#x5E36;&#x4F86;&#x69A6;&#x64FE;, &#x90A3;&#x9EBD;&#x53EF;&#x4EE5;&#x901A;&#x904E; testing.B &#x53C3;&#x6578;&#x7684;&#x65B9;&#x6CD5;&#x4F86;&#x81E8;&#x6642;&#x95DC;&#x9589;&#x6216;&#x91CD;&#x7F6E;&#x8A08;&#x6642;&#x5668;, &#x4E0D;&#x904E;&#x9019;&#x4E9B;&#x4E00;&#x822C;&#x5F88;&#x5C11;&#x6703;&#x7528;&#x5230;.</p>
<p>&#x73FE;&#x5728;&#x6211;&#x5011;&#x6709;&#x4E86;&#x4E00;&#x500B;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x548C;&#x666E;&#x901A;&#x6E2C;&#x8A66;, &#x6211;&#x5011;&#x53EF;&#x4EE5;&#x5F88;&#x5BB9;&#x6613;&#x6E2C;&#x8A66;&#x65B0;&#x7684;&#x8B93;&#x7A0B;&#x5E8F;&#x904B;&#x884C;&#x66F4;&#x5FEB;&#x7684;&#x60F3;&#x6CD5;. &#x4E5F;&#x8A31;&#x6700;&#x660E;&#x986F;&#x7684;&#x512A;&#x5316;&#x662F;&#x5728; IsPalindrome &#x51FD;&#x6578;&#x4E2D;&#x7B2C;&#x4E8C;&#x500B;&#x5FAA;&#x74B0;&#x7684;&#x505C;&#x6B62;&#x6AA2;&#x67FB;, &#x9019;&#x6A23;&#x53EF;&#x4EE5;&#x907F;&#x514D;&#x6BCF;&#x500B;&#x6BD4;&#x8F03;&#x90FD;&#x505A;&#x5169;&#x6B21;:</p>
2015-12-14 04:08:47 +00:00
<pre><code class="lang-Go">n := <span class="hljs-built_in">len</span>(letters)/<span class="hljs-number">2</span>
<span class="hljs-keyword">for</span> i := <span class="hljs-number">0</span>; i &lt; n; i++ {
<span class="hljs-keyword">if</span> letters[i] != letters[<span class="hljs-built_in">len</span>(letters)-<span class="hljs-number">1</span>-i] {
<span class="hljs-keyword">return</span> <span class="hljs-constant">false</span>
}
}
<span class="hljs-keyword">return</span> <span class="hljs-constant">true</span>
</code></pre>
2015-12-21 04:55:18 +00:00
<p>&#x4E0D;&#x904E;&#x5F88;&#x591A;&#x60C5;&#x6CC1;&#x4E0B;, &#x4E00;&#x500B;&#x660E;&#x986F;&#x7684;&#x512A;&#x5316;&#x4F75;&#x4E0D;&#x4E00;&#x5B9A;&#x5C31;&#x80FD;&#x4EE3;&#x78BC;&#x9810;&#x671F;&#x7684;&#x6548;&#x679C;. &#x9019;&#x500B;&#x6539;&#x9032;&#x5728;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x4E2D;&#x503C;&#x5E36;&#x4F86;&#x4E86; 4% &#x7684;&#x6027;&#x80FD;&#x63D0;&#x965E;.</p>
2015-12-14 04:08:47 +00:00
<pre><code>$ go test -bench=.
PASS
BenchmarkIsPalindrome-8 1000000 992 ns/op
ok gopl.io/ch11/word2 2.093s
2015-12-21 04:55:18 +00:00
</code></pre><p>&#x53E6;&#x4E00;&#x500B;&#x6539;&#x9032;&#x60F3;&#x6CD5;&#x662F;&#x5728;&#x958B;&#x59CB;&#x7232;&#x6BCF;&#x500B;&#x5B57;&#x7B26;&#x9810;&#x5148;&#x5206;&#x914D;&#x4E00;&#x500B;&#x8DB3;&#x5920;&#x5927;&#x7684;&#x6578;&#x7D44;, &#x9019;&#x6A23;&#x5C31;&#x53EF;&#x4EE5;&#x907F;&#x514D;&#x5728; append &#x8ABF;&#x7528;&#x6642;&#x53EF;&#x80FD;&#x6703;&#x5C0E;&#x81F4;&#x5167;&#x5B58;&#x7684;&#x591A;&#x6B21;&#x91CD;&#x65B0;&#x5206;&#x914D;. &#x8072;&#x660E;&#x4E00;&#x500B; letters &#x6578;&#x7D44;&#x8B8A;&#x91CF;, &#x4F75;&#x6307;&#x5B9A;&#x5408;&#x9069;&#x7684;&#x5927;&#x5C0F;, &#x50CF;&#x9019;&#x6A23;,</p>
2015-12-14 04:08:47 +00:00
<pre><code class="lang-Go">letters := <span class="hljs-built_in">make</span>([]<span class="hljs-typename">rune</span>, <span class="hljs-number">0</span>, <span class="hljs-built_in">len</span>(s))
<span class="hljs-keyword">for</span> _, r := <span class="hljs-keyword">range</span> s {
<span class="hljs-keyword">if</span> unicode.IsLetter(r) {
letters = <span class="hljs-built_in">append</span>(letters, unicode.ToLower(r))
}
}
</code></pre>
2015-12-21 04:55:18 +00:00
<p>&#x9019;&#x500B;&#x6539;&#x9032;&#x63D0;&#x965E;&#x6027;&#x80FD;&#x7D04; 35%, &#x5831;&#x544A;&#x7D50;&#x679C;&#x662F;&#x57FA;&#x65BC; 2,000,000 &#x6B21;&#x8FED;&#x4EE3;&#x7684;&#x5E73;&#x5747;&#x904B;&#x884C;&#x6642;&#x9593;&#x7D71;&#x8A08;.</p>
2015-12-14 04:08:47 +00:00
<pre><code>$ go test -bench=.
PASS
BenchmarkIsPalindrome-8 2000000 697 ns/op
ok gopl.io/ch11/word2 1.468s
2015-12-21 04:55:18 +00:00
</code></pre><p>&#x5982;&#x9019;&#x500B;&#x4F8B;&#x5B50;&#x6240;&#x793A;, &#x5FEB;&#x7684;&#x7A0B;&#x5E8F;&#x5F80;&#x5F80;&#x662F;&#x6709;&#x5F88;&#x5C11;&#x7684;&#x5167;&#x5B58;&#x5206;&#x914D;. <code>-benchmem</code> &#x547D;&#x4EE4;&#x884C;&#x6A19;&#x8A8C;&#x53C3;&#x6578;&#x5C07;&#x5728;&#x5831;&#x544A;&#x4E2D;&#x5305;&#x542B;&#x5167;&#x5B58;&#x7684;&#x5206;&#x914D;&#x6578;&#x64DA;&#x7D71;&#x8A08;. &#x6211;&#x5011;&#x53EF;&#x4EE5;&#x6BD4;&#x8F03;&#x512A;&#x5316;&#x524D;&#x5F8C;&#x5167;&#x5B58;&#x7684;&#x5206;&#x914D;&#x60C5;&#x6CC1;:</p>
2015-12-14 04:08:47 +00:00
<pre><code>$ go test -bench=. -benchmem
PASS
BenchmarkIsPalindrome 1000000 1026 ns/op 304 B/op 4 allocs/op
</code></pre><p>&#x9019;&#x662F;&#x512A;&#x5316;&#x4E4B;&#x5F8C;&#x7684;&#x7D50;&#x679C;:</p>
<pre><code>$ go test -bench=. -benchmem
PASS
BenchmarkIsPalindrome 2000000 807 ns/op 128 B/op 1 allocs/op
</code></pre><p>&#x4E00;&#x6B21;&#x5167;&#x5B58;&#x5206;&#x914D;&#x4EE3;&#x66FF;&#x591A;&#x6B21;&#x7684;&#x5167;&#x5B58;&#x5206;&#x914D;&#x7BC0;&#x7701;&#x4E86;75%&#x7684;&#x5206;&#x914D;&#x8ABF;&#x7528;&#x6B21;&#x6578;&#x548C;&#x6E1B;&#x5C11;&#x8FD1;&#x4E00;&#x534A;&#x7684;&#x5167;&#x5B58;&#x9700;&#x6C42;.</p>
2015-12-21 04:55:18 +00:00
<p>&#x9019;&#x500B;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x544A;&#x8A34;&#x6211;&#x5011;&#x6240;&#x9700;&#x7684;&#x7D76;&#x5C0D;&#x6642;&#x9593;&#x4F9D;&#x8CF4;&#x7D66;&#x5B9A;&#x7684;&#x5177;&#x9AD4;&#x64CD;&#x4F5C;, &#x5169;&#x500B;&#x4E0D;&#x540C;&#x7684;&#x64CD;&#x4F5C;&#x6240;&#x9700;&#x6642;&#x9593;&#x7684;&#x5DEE;&#x7570;&#x4E5F;&#x662F;&#x548C;&#x4E0D;&#x540C;&#x74B0;&#x5883;&#x76F8;&#x95DC;&#x7684;. &#x4F8B;&#x5982;, &#x5982;&#x679C;&#x4E00;&#x500B;&#x51FD;&#x6578;&#x9700;&#x8981; 1ms &#x8655;&#x7406; 1,000 &#x500B;&#x5143;&#x7D20;, &#x90A3;&#x9EBD;&#x8655;&#x7406; 10000 &#x6216; 1&#x767E;&#x842C; &#x5C07;&#x9700;&#x8981;&#x591A;&#x5C11;&#x6642;&#x9593;&#x5462;? &#x9019;&#x6A23;&#x7684;&#x6BD4;&#x8F03;&#x63ED;&#x793A;&#x4E86;&#x6F38;&#x8FD1;&#x589E;&#x9577;&#x51FD;&#x6578;&#x7684;&#x904B;&#x884C;&#x6642;&#x9593;. &#x53E6;&#x4E00;&#x500B;&#x4F8B;&#x5B50;: I/O &#x7DE9;&#x5B58;&#x8A72;&#x8A2D;&#x7F6E;&#x7232;&#x591A;&#x5927;&#x5462;? &#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x53EF;&#x4EE5;&#x5E6B;&#x52A9;&#x6211;&#x5011;&#x9078;&#x64C7;&#x8F03;&#x5C0F;&#x7684;&#x7DE9;&#x5B58;&#x4F46;&#x80FD;&#x5E36;&#x4F86;&#x6EFF;&#x610F;&#x7684;&#x6027;&#x80FD;. &#x7B2C;&#x4E09;&#x500B;&#x4F8B;&#x5B50;: &#x5C0D;&#x65BC;&#x4E00;&#x500B;&#x78BA;&#x5B9A;&#x7684;&#x5DE5;&#x4F5C;&#x90A3;&#x7A2E;&#x7B97;&#x6CD5;&#x66F4;&#x597D;? &#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x53EF;&#x4EE5;&#x8A55;&#x4F30;&#x5169;&#x7A2E;&#x4E0D;&#x540C;&#x7B97;&#x6CD5;&#x5C0D;&#x65BC;&#x76F8;&#x540C;&#x7684;&#x8F38;&#x5165;&#x5728;&#x4E0D;&#x540C;&#x7684;&#x5834;&#x666F;&#x548C;&#x8CA0;&#x8F09;&#x4E0B;&#x7684;&#x512A;&#x7F3A;&#x9EDE;.</p>
<p>&#x6BD4;&#x8F03;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x90FD;&#x662F;&#x7D50;&#x69CB;&#x985E;&#x4F3C;&#x7684;&#x4EE3;&#x78BC;. &#x5B83;&#x5011;&#x901A;&#x5E38;&#x662F;&#x91C7;&#x7528;&#x4E00;&#x500B;&#x53C3;&#x6578;&#x7684;&#x51FD;&#x6578;, &#x5F9E;&#x5E7E;&#x500B;&#x6A19;&#x8A8C;&#x7684;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x51FD;&#x6578;&#x5165;&#x53E3;&#x8ABF;&#x7528;, &#x5C31;&#x50CF;&#x9019;&#x6A23;:</p>
2015-12-14 04:08:47 +00:00
<pre><code class="lang-Go"><span class="hljs-keyword">func</span> benchmark(b *testing.B, size <span class="hljs-typename">int</span>) { <span class="hljs-comment">/* ... */</span> }
<span class="hljs-keyword">func</span> Benchmark10(b *testing.B) { benchmark(b, <span class="hljs-number">10</span>) }
<span class="hljs-keyword">func</span> Benchmark100(b *testing.B) { benchmark(b, <span class="hljs-number">100</span>) }
<span class="hljs-keyword">func</span> Benchmark1000(b *testing.B) { benchmark(b, <span class="hljs-number">1000</span>) }
</code></pre>
2015-12-21 04:55:18 +00:00
<p>&#x901A;&#x904E;&#x51FD;&#x6578;&#x53C3;&#x6578;&#x4F86;&#x6307;&#x5B9A;&#x8F38;&#x5165;&#x7684;&#x5927;&#x5C0F;, &#x4F46;&#x662F;&#x53C3;&#x6578;&#x8B8A;&#x91CF;&#x5C0D;&#x65BC;&#x6BCF;&#x500B;&#x5177;&#x9AD4;&#x7684;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x90FD;&#x662F;&#x56FA;&#x5B9A;&#x7684;. &#x8981;&#x907F;&#x514D;&#x76F4;&#x63A5;&#x8129;&#x6539; b.N &#x4F86;&#x63A7;&#x88FD;&#x8F38;&#x5165;&#x7684;&#x5927;&#x5C0F;. &#x9664;&#x975E;&#x4F60;&#x5C07;&#x5B83;&#x4F5C;&#x7232;&#x4E00;&#x500B;&#x56FA;&#x5B9A;&#x5927;&#x5C0F;&#x7684;&#x8FED;&#x4EE3;&#x8A08;&#x7B97;&#x8F38;&#x5165;, &#x5426;&#x5247;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x7684;&#x7D50;&#x679C;&#x5C07;&#x6BEB;&#x7121;&#x610F;&#x7FA9;.</p>
<p>&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x5C0D;&#x65BC;&#x7DE8;&#x5BEB;&#x4EE3;&#x78BC;&#x662F;&#x5F88;&#x6709;&#x5E6B;&#x52A9;&#x7684;, &#x4F46;&#x662F;&#x537D;&#x4F7F;&#x5DE5;&#x4F5C;&#x5B8C;&#x6210;&#x4E86;&#x61C9;&#x61C9;&#x7576;&#x4FDD;&#x5B58;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x4EE3;&#x78BC;. &#x56E0;&#x7232;&#x96A8;&#x7740;&#x9805;&#x76EE;&#x7684;&#x767C;&#x5C55;, &#x6216;&#x8005;&#x662F;&#x8F38;&#x5165;&#x7684;&#x589E;&#x52A0;, &#x6216;&#x8005;&#x662F;&#x90E8;&#x7F72;&#x5230;&#x65B0;&#x7684;&#x64CD;&#x4F5C;&#x7E6B;&#x7D71;&#x6216;&#x4E0D;&#x540C;&#x7684;&#x8655;&#x7406;&#x5668;, &#x6211;&#x5011;&#x53EF;&#x4EE5;&#x518D;&#x6B21;&#x7528;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;&#x4F86;&#x5E6B;&#x52A9;&#x6211;&#x5011;&#x6539;&#x9032;&#x8A2D;&#x8A08;.</p>
<p><strong>&#x7DF4;&#x7FD2; 11.6:</strong> &#x7232; 2.6.2&#x7BC0; &#x7684; &#x7DF4;&#x7FD2; 2.4 &#x548C; &#x7DF4;&#x7FD2; 2.5 &#x7684; PopCount &#x51FD;&#x6578;&#x7DE8;&#x5BEB;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;. &#x770B;&#x770B;&#x57FA;&#x65BC;&#x8868;&#x683C;&#x7B97;&#x6CD5;&#x5728;&#x4E0D;&#x540C;&#x60C5;&#x6CC1;&#x4E0B;&#x7684;&#x6027;&#x80FD;.</p>
2015-12-28 08:08:26 +00:00
<p><strong>&#x7DF4;&#x7FD2; 11.7:</strong> &#x7232; *IntSet (&#xA7;6.5) &#x7684; Add, UnionWith &#x548C; &#x5176;&#x4ED6;&#x65B9;&#x6CD5;&#x7DE8;&#x5BEB;&#x57FA;&#x6E96;&#x6E2C;&#x8A66;, &#x4F7F;&#x7528;&#x5927;&#x91CF;&#x96A8;&#x6A5F;&#x51FA;&#x5165;. &#x4F60;&#x53EF;&#x4EE5;&#x8B93;&#x9019;&#x4E9B;&#x65B9;&#x6CD5;&#x8DD1;&#x591A;&#x5FEB;? &#x9078;&#x64C7;&#x5B57;&#x7684;&#x5927;&#x5C0F;&#x5C0D;&#x65BC;&#x6027;&#x80FD;&#x7684;&#x5F71;&#x97FF;&#x5982;&#x4F55;? IntSet &#x548C;&#x57FA;&#x65BC;&#x5167;&#x5EFA; map &#x7684;&#x5BE6;&#x73FE;&#x76F8;&#x6BD4;&#x6709;&#x591A;&#x5FEB;?</p>
2015-12-09 07:57:17 +00:00
</section>
</div>
</div>
</div>
<a href="../ch11/ch11-03.html" class="navigation navigation-prev " aria-label="Previous page: 測試覆蓋率"><i class="fa fa-angle-left"></i></a>
<a href="../ch11/ch11-05.html" class="navigation navigation-next " aria-label="Next page: 剖析"><i class="fa fa-angle-right"></i></a>
</div>
</div>
<script src="../gitbook/app.js"></script>
<script src="../gitbook/plugins/gitbook-plugin-sharing/buttons.js"></script>
<script src="../gitbook/plugins/gitbook-plugin-fontsettings/buttons.js"></script>
<script>
require(["gitbook"], function(gitbook) {
2015-12-28 08:08:26 +00:00
var config = {"katex":{},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"fontsettings":{"theme":"white","family":"sans","size":2}};
2015-12-09 07:57:17 +00:00
gitbook.start(config);
});
</script>
</body>
</html>