Contents

Title and Copyright Information

Preface

• Documentation Accessibility
• Conventions

1 About Profiling and Performance Tuning

2 Understanding the Tuning Trade-offs

• 2.1 Pause Times and Throughput
  • 2.1.1 Concurrent and Stop-the-World
  • 2.1.2 Compaction Pauses and Throughput
• 2.2 Performance and Memory Footprint
  • 2.2.1 Heap Size and Throughput
  • 2.2.2 Bookkeeping and Pause Times

3 Tuning the Oracle JRockit JVM: The First Steps

• 3.1 Step 1: Basic Tuning
  • 3.1.1 Tuning the Heap Size
  • 3.1.2 Tuning the Garbage Collection
  • 3.1.3 Tuning the Nursery Size
  • 3.1.4 Tuning the Pause Target
• 3.2 Step 2: Performance Tuning
  • 3.2.1 Call Profiling
  • 3.2.2 Large Pages
• 3.3 Step 3: Advanced Tuning
  • 3.3.1 Tuning Compaction
    • 3.3.1.1 Compaction Ratio
    • 3.3.1.2 Maximum References
  • 3.3.2 Tuning the Thread Local Area Size
• 3.4 Best Practices
  • 3.4.1 Oracle WebLogic Server
  • 3.4.2 Oracle WebLogic SIP Server
  • 3.4.3 Oracle Complex Event Processing
  • 3.4.4 Eclipse IDE
  • 3.4.5 Utility Applications
  • 3.4.6 Batch Runs

4 Tuning the Memory Management System

• 4.1 Setting the Heap and Nursery Size
  • 4.1.1 Setting the Heap Size
    • 4.1.1.1 Setting the Heap Size on 64-bit Systems
  • 4.1.2 Setting the Nursery and Keep Area Size
    • 4.1.2.1 Keep Area
• 4.2 Selecting and Tuning a Garbage Collector
  • 4.2.1 Selecting a Garbage Collection Mode
    • 4.2.1.1 Throughput Mode
    • 4.2.1.2 Pausetime Mode
    • 4.2.1.3 Deterministic Mode
    • 4.2.1.4 Garbage Collector Mode Selection Workflow
    • 4.2.1.5 Changing Garbage Collection Mode at Run Time
  • 4.2.2 Tuning the Concurrent Garbage Collection Trigger
• 4.3 Tuning Compaction
  • 4.3.1 Fragmentation vs. Garbage Collection Pauses
  • 4.3.2 Adjusting Compaction
    • 4.3.2.1 Setting the Compaction Ratio
    • 4.3.2.2 Setting Maximum References
    • 4.3.2.3 Turning Off Compaction
    • 4.3.2.4 Using Full Compaction
• 4.4 Optimizing Memory Allocation Performance
  • 4.4.1 Setting the Thread Local Area Size

5 Tuning Locks

• 5.1 Lock Profiling
• 5.2 Disabling Spinning Against Fat Locks
• 5.3 Adaptive Spinning Against Fat Locks
• 5.4 Lock Deflation
• 5.5 Lazy Unlocking

6 Tuning for Low Latencies

• 6.1 Measuring Latencies
• 6.2 Tuning the Garbage Collector for Low Latencies
  • 6.2.1 Dynamic Garbage Collection Mode Optimized for Deterministic Pause Times
  • 6.2.2 Dynamic Garbage Collection Mode Optimized for Short Pauses
  • 6.2.3 Static Generational Concurrent Garbage Collection
• 6.3 Tuning the Heap Size
• 6.4 Manually Tuning the Nursery Size
• 6.5 Manually Tuning Compaction
• 6.6 Tune when to Trigger a Garbage Collection

7 Tuning for Better Application Throughput

• 7.1 Measuring Application Throughput
• 7.2 Selecting the Garbage Collector for Maximum Throughput
  • 7.2.1 Dynamic Garbage Collection Mode Optimized for Throughput
  • 7.2.2 Static Single-Spaced Parallel Garbage Collection
  • 7.2.3 Static Generational Parallel Garbage Collection
• 7.3 Tuning the Heap Size
• 7.4 Manually Tuning the Nursery Size
• 7.5 Manually Tuning Compaction
• 7.6 Tuning the Thread-Local Area Size

8 Tuning for Stable Performance

• 8.1 Measuring the Performance Variance
• 8.2 Tuning the Heap Size
• 8.3 Manually Tuning the Nursery Size
• 8.4 Tuning the Garbage Collector
• 8.5 Tuning Compaction

9 Tuning for a Small Memory Footprint

• 9.1 Measuring the Memory Footprint
• 9.2 Setting the Heap Size
• 9.3 Selecting a Garbage Collector
• 9.4 Tuning Compaction
• 9.5 Tuning Object Allocation

10 Tuning for a Faster JVM Startup

• 10.1 Measuring the Startup Time
• 10.2 Setting the Heap Size
• 10.3 Troubleshooting Your Application and the JVM