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Red Hat ENTERPRISE LINUX 5.4 - SYSTEMTAP BEGINNERS GUIDE manuali

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Red hat ENTERPRISE LINUX 5.4 - SYSTEMTAP BEGINNERS GUIDE Informazioni Techniche (240 pagine)


Marchio: Red-hat | Categoria: Software | Dimensione: 1.09 MB |

 

Indice

SUSE Linux

1

Enterprise Server

1

Contents

3

III Kernel Monitoring 69

4

IV Resource Management 113

5

V Kernel Tuning 153

6

16 Tuning the Network 187

7

17 Tracing Tools 193

7

18 kexec and kdump 205

7

A GNU Licenses 221

8

About This Guide

9

1 Available Documentation

10

2 Feedback

12

3 Documentation Conventions

13

PartI.Basics

15

General Notes on System

17

1.2 Rule Out Common Problems

18

1.3 Finding the Bottleneck

18

1.4 Step-by-step Tuning

19

PartII.System Monitoring

21

System Monitoring Utilities

23

2.1.1 vmstat

24

With sadc

27

CPU Utilization Report: sar

28

Memory Usage Report: sar -r

28

2.1.2.3 Visualizing sar Data

30

2.2 System Information

31

Viewer: udevadm monitor

34

2.3 Processes

35

2.3.2 Process List: ps

36

2.3.3 Process Tree: pstree

37

2.3.4 Table of Processes: top

38

2.4 Memory

42

HugePages_Rsvd: 0

44

HugePages_Surp: 0

44

Hugepagesize: 2048 kB

44

DirectMap4k: 2689024 kB

44

DirectMap2M: 5691392 kB

44

2.5 Networking

45

2.6 The /proc File System

49

2.6.1 procinfo

51

2.7 Hardware Information

53

2.8 Files and File Systems

54

Binaries

56

2.8.4 File Properties: stat

56

2.9 User Information

57

2.10 Time and Date

57

2.11 Graph Your Data: RRDtool

58

2.11.2.1 Collecting Data

59

2.11.2.2 Creating Database

60

2.11.3 For More Information

63

Monitoring with Nagios

65

3.3.1 Object Definition Files

67

3.4 Configuring Nagios

69

3.5 Troubleshooting

72

3.6 For More Information

73

Analyzing and Managing

75

System Log Files

75

4.3 Managing Log Files with

78

4.4 Monitoring Log Files with

80

Log Entries

81

PartIII.Kernel Monitoring

83

SystemTap—Filtering and

85

Analyzing System Data

85

5.1.1 SystemTap Scripts

86

5.1.2 Tapsets

86

5.1.3 Commands and Privileges

87

5.2 Installation and Setup

88

5.3 Script Syntax

90

Ctrl + C

91

5.3.3.1 Functions

92

Variables

95

Conditional Statements

96

5.4 Example Script

97

5.5 User-Space Probing

98

5.6 For More Information

99

Kernel Probes

101

6.1 Supported Architectures

102

6.2 Types of Kernel Probes

102

6.3 Kernel probes API

103

6.4 Debugfs Interface

104

6.5 For More Information

105

Perfmon2—Hardware

107

Based Performance

107

Monitoring

107

7.1.2 Sampling and Counting

108

7.2 Installation

109

7.3 Using Perfmon

110

7.4 Retrieving Metrics From

113

interrupt =

115

ovfl_intr_ns /

115

ovfl_intr_all_count

115

7.5 For More Information

116

OProfile—System-Wide

119

Profiler

119

8.4 Using OProfile

120

8.4.1 General Steps

121

8.5 Using OProfile's GUI

123

8.6 Generating Reports

124

8.7 For More Information

124

PartIV.Resource

127

Management

127

General System Resource

129

9.1.2 Installation Scope

130

9.1.3 Default Runlevel

130

9.2 Disabling Unnecessary

131

Services

131

9.3.1 File Systems

132

Kernel Control Groups

135

10.2 Scenario

136

Disk I/O

137

Network I/O

137

10.3 Control Group Subsystems

138

10.4 Using Controller Groups

141

10.4.3 Example: Cpusets

142

10.4.4 Example: cgroups

143

10.5 For More Information

144

Power Management

147

11.1.4 Turbo Features

150

11.2 The Linux Kernel CPUfreq

151

Infrastructure

151

11.3 Viewing, Monitoring and

153

Tuning Power-related Settings

153

Statistics with cpupower

157

11.4 Special Tuning Options

160

11.5 Creating and Using Power

163

Management Profiles

163

11.6 Troubleshooting

164

11.7 For More Information

165

PartV.Kernel Tuning

167

Installing Multiple Kernel

169

Versions

169

12.1 Enabling and Configuring

170

Multiversion Support

170

Kernel Versions with YaST

171

Kernel Versions with zypper

172

Tuning I/O Performance

175

13.2 Available I/O Elevators

176

13.2.2 NOOP

177

13.2.3 DEADLINE

177

13.3 I/O Barrier Tuning

178

Tuning the Task Scheduler

179

14.2 Process Classification

180

14.3 O(1) Scheduler

181

14.4.1 How CFS Works

183

14.4.2 Grouping Processes

183

14.4.4 Terminology

184

Scheduler Statistics

189

14.5 For More Information

190

Tuning the Memory

193

Management Subsystem

193

15.1 Memory Usage

194

15.1.4 Buffer Heads

195

15.1.5 Writeback

195

15.1.6 Readahead

195

15.1.7 VFS caches

195

15.2 Reducing Memory Usage

196

Tunable Parameters

197

15.3.2 Writeback Parameters

198

15.3.3 Readahead parameters

199

15.3.4 Further VM Parameters

199

15.5 Monitoring VM Behavior

200

Tuning the Network

201

/proc/sys/net/ipv6

202

/proc/sys/net/core

202

/proc/sys/net/ipv4

202

16.3 Netfilter

203

16.4 For More Information

204

PartVI.Handling

205

System Dumps

205

Tracing Tools

207

Valgrind

212

17.3.3 General Information

213

17.3.4 Default Options

214

17.3.5 How Valgrind Works

214

17.3.6 Messages

215

17.3.7 Error Messages

216

17.4 For More Information

217

18.1 Introduction

219

18.2 Required Packages

220

18.3 kexec Internals

220

18.4 Basic kexec Usage

221

Routine Reboots

222

/sbin/mkinitrd -D vlan0

223

/sbin/mkinitrd -I eth0

223

18.6.2 YaST Configuration

226

18.7 Analyzing the Crash Dump

227

18.7.1 Kernel Binary Formats

228

18.8 Advanced kdump

231

Configuration

231

18.9 For More Information

232

GNU Licenses

235

2. VERBATIM COPYING

236

3. COPYING IN QUANTITY

236

4. MODIFICATIONS

236

5. COMBINING DOCUMENTS

237

GNU Licenses 225

239




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