Contents

Title and Copyright Information

Preface

• About the Document
• Documentation Accessibility
• Conventions

1 Overview of Oracle JRockit JDK Tools

• 1.1 Customizable Verbose Logs
• 1.2 Thread Dumps
• 1.3 Diagnostic Commands
• 1.4 Time Zone Updater
• 1.5 Oracle JRockit Mission Control Client
  • 1.5.1 JRockit Browser
  • 1.5.2 JRockit Management Console
  • 1.5.3 JRockit Flight Recorder
  • 1.5.4 JRockit Memory Leak Detector
  • 1.5.5 Mission Control Documentation

2 Understanding Verbose Output

• 2.1 Memory Management Verbose Log Modules
  • 2.1.1 Verbose memory Log Module
    • 2.1.1.1 Initial Output of the memory Module
    • 2.1.1.2 Garbage Collection Output of the memory Module
    • 2.1.1.3 Page Fault Warning
  • 2.1.2 Verbose nursery Log Module
    • 2.1.2.1 Young Collection Output of the nursery Module
    • 2.1.2.2 Verbose Nursery-Size-Adjustment Output of the nursery Module
  • 2.1.3 Verbose memdbg Log Module
    • 2.1.3.1 Initial Output of the memdbg Module
    • 2.1.3.2 Parallel Old Collection Output of the memdbg Module
    • 2.1.3.3 Concurrent Old Collection Output of the memdbg Module
    • 2.1.3.4 Young Collection Output of the memdbg Module
    • 2.1.3.5 Parallel Sweep in Concurrent Old Collections
  • 2.1.4 Verbose Compaction Log Module
    • 2.1.4.1 Output of a Skipped Compaction
  • 2.1.5 Verbose gcpause Log Module
    • 2.1.5.1 Parallel Old Collection Output of the gcpause Module
    • 2.1.5.2 Concurrent Old Collection Output of the gcpause Module
  • 2.1.6 Verbose gcreport Log Module
  • 2.1.7 Verbose refobj Log Module
  • 2.1.8 Verbose alloc Log Module
• 2.2 Other Verbose Log Modules
  • 2.2.1 Output of the opt Module
  • 2.2.2 Verbose exceptions Log Module

3 Using Thread Dumps

• 3.1 Creating Thread Dumps
• 3.2 Reading Thread Dumps
  • 3.2.1 The Beginning of the Thread Dump
  • 3.2.2 Stack Trace for the Main Application Thread
  • 3.2.3 Locks and Lock Chains
    • 3.2.3.1 Presentation of Locks Out of Order
  • 3.2.4 JVM Internal Threads
  • 3.2.5 Other Java Application Threads
  • 3.2.6 Lock Chains
• 3.3 Thread Status in Thread Dumps
  • 3.3.1 Life States
  • 3.3.2 Run States
  • 3.3.3 Special States
• 3.4 Troubleshooting with Thread Dumps
  • 3.4.1 Detecting Deadlocks
  • 3.4.2 Detecting Processing Bottlenecks
  • 3.4.3 Viewing the Run-time Profile of an Application

4 Running Diagnostic Commands

• 4.1 Methods for Running Diagnostic Commands
• 4.2 Using jrcmd
  • 4.2.1 How to Use jrcmd
  • 4.2.2 jrcmd Examples
    • 4.2.2.1 Listing JRockit JVM Processes
    • 4.2.2.2 Sending a Command to a Process
    • 4.2.2.3 Sending Several Commands
  • 4.2.3 Known Limitations of jrcmd
• 4.3 Using the Ctrl-Break Handler
• 4.4 Getting Help