javaperformance,thedefinitiveguide - CSDN文库

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Table of Contents

Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix

1.

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

A Brief Outline 2

Platforms and Conventions 2

JVM Tuning Flags 4

The Complete Performance Story 5

Write Better Algorithms 5

Write Less Code 6

Oh Go Ahead, Prematurely Optimize 7

Look Elsewhere: The Database Is Always the Bottleneck 8

Optimize for the Common Case 9

Summary 10

2.

An Approach to Performance Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Test a Real Application 11

Microbenchmarks 11

Macrobenchmarks 16

Mesobenchmarks 18

Common Code Examples 20

Understand Throughput, Batching, and Response Time 24

Elapsed Time (Batch) Measurements 24

Throughput Measurements 25

Response Time Tests 26

Understand Variability 29

Test Early, Test Often 33

Summary 36

3.

A Java Performance Toolbox. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Operating System Tools and Analysis 37

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