这本实用指南为开发人员讲解在 C++ 中实现优化的性能调优原则。您将学习如何使得已经包含了 C++ 设计最佳实践的代码在任何计算机上更快地运行并消耗更少的资源——无论是手表，电话，工作站，超级计算机或全球服务器网络。作者 Kurt Guntheroth 提供了几个运行示例，演示如何逐步应用这些原则以改进现有代码，从而满足客户对响应速度和数据吞吐量的要求。

Preface

1． An Overview of Optimization

Optimization Is Part of Software Development

Optimization Is Effective

It's OK to Optimize

A Nanosecond Here， a Nanosecond There

Summary of Strategies for Optimizing C++ Code

Use a Better Compiler， Use Your Compiler Better

Use Better Algorithms

Use Better Libraries

Reduce Memory Allocation and Copying

Remove Computation

Use Better Data Structures

Increase Concurrency

Optimize Memory Management

Summary

2． Computer Behavior Affecting Optimization

Lies C++ Believes About Computers

The Truth About Computers

Memory Is Slow

Memory Is Not Accessed in Bytes

Some Memory Accesses Are Slower than Others

Memory Words Have a Big End and a Little End

Memory Has Finite Capacity

Instruction Execution Is Slow

Making Decisions Is Hard for Computers

There Are Multiple Streams of Program Execution

Calling into the Operating System Is Expensive

C++ Tells Lies Too

All Statements Are Not Equally Expensive

Statements Are Not Executed in Order

Summary

3． Measure Performance

The Optimizing Mindset

Performance Must Be Measured

Optimizers Are Big Game Hunters

The 90/10 Rule

Amdahl's Law

Perform Experiments

Keep a Lab Notebook

Measure Baseline Performance and Set Goals

You Can Improve Only What You Measure

Profile Program Execution

Time Long-Running Code

'~ Little Learning" About Measuring Time

Measuring Time with Computers

Overcoming Measurement Obstacles

Create a Stopwatch Class

Time Hot Functions in a Test Harness

Estimate Code Cost to Find Hot Code

Estimate the Cost of Individual C++ Statements

Estimate the Cost of Loops

Other Ways to Find Hot Spots

Summary

4． Optimize String Use： A Case Study

Why Strings Are a Problem

Strings Are Dynamically Allocated

Strings Are Values

Strings Do a Lot of Copying

First Attempt at Optimizing Strings

Use Mutating String Operations to Eliminate Temporaries

Reduce Reallocation by Reserving Storage

Eliminate Copying of String Arguments

Eliminate Pointer Dereference Using Iterators

Eliminate Copying of Returned String Values

Use Character Arrays Instead of Strings

……

5． Optimize Algorithms

6． Optimize Dynamically Allocated Variables

7． Optimize Hot Statements

8． Use Better Libraries

9． Optimize Searching and Sorting

10． Optimize Data Structures

11． Optimize I/0

12． Optimize Concurrency

13． Optimize Memory Management