Java Performance Companion

Java Performance Companion

By: Monica Beckwith (author), Bengt Rutisson (author), John Cuthbertson (author), Poonam Parhar (author), Charlie Hunt (author)Paperback

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Java(R) Performance Companion shows how to systematically and proactively improve Java performance with today's advanced multicore hardware and complex operating system environments. The authors, who are all leading Java performance and Java HotSpot VM experts, help you improve performance by using modern software engineering practices, avoiding common mistakes, and applying tips and tricks gleaned from years of real-world experience. Picking up where Charlie Hunt and Binu John's classic Java Performance left off, this book provides unprecedented detail on two powerful Java platform innovations: the Garbage First (G1) garbage collector and the HotSpot VM Serviceability Agent. Coverage includes * Leveraging G1 to overcome limitations in parallel, serial, and CMS garbage collection* Understanding each stage of G1 GC collections, both young and old* Getting under the hood with G1 and efficiently fine-tuning it for your application* Identifying potential optimizations, interpreting experimental results, and taking action* Exploring the internals of the HotSpot VM* Using HotSpot VM Serviceability Agent to analyze, triage, and resolve diverse HotSpot VM issues* Troubleshooting out of memory errors, Java level deadlocks, and HotSpot VM crashes* Extending the Serviceability Agent, and using the Plugin for VisualVM* Mastering useful HotSpot VM command line options not covered in Java(TM) Performance Java(R) Performance Companion can help you squeeze maximum performance and value from Java with JDK 8 or 9-for any application, in any environment. Register your product at

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About Author

Charlie Hunt, is a JVM Performance Engineer at Oracle where he works on the performance of Java SE, Java EE, Java HotSpot VM, and Java SE class libraries. He presents on Java performance at various events, including JavaOne, QCon, Velocity, and Dreamforce, and he coauthored Java Performance (Addison-Wesley, 2012). Monica Beckwith is an independent performance consultant optimizing customer applications for server class systems running the Java Virtual Machine. She has worked with Java HotSpot VM optimizing the JIT Compiler, the generated code, the JVM heuristics and garbage collection and collectors. Monica led Oracle's Garbage First Garbage Collector performance team and was named a JavaOne Rock Star. Poonam Parhar is a JVM Sustaining Engineer at Oracle, where her primary responsibility is to resolve customer-escalated problems against Oracle JRockit and Java HotSpot VMs. She loves debugging and troubleshooting problems, and is always focused on improving the serviceability and supportability of the JVM. Bengt Rutisson is a JVM Engineer at Oracle, working in the HotSpot VM team. He has worked on garbage collections in JVMs for the past ten years, first with the Oracle JRockit VM and the last six years with the Java HotSpot VM. Bengt is an active participant in the OpenJDK project, with many contributions of features, stability fixes and performance enhancements.


Preface ix Acknowledgments xi About the Authors xv Chapter 1: Garbage First Overview 1 Terminology 1 Parallel GC 2 Serial GC 4 Concurrent Mark Sweep (CMS) GC 5 Garbage First (G1) GC 8 References 14 Chapter 2: Garbage First Garbage Collector in Depth 15 Background 15 Garbage Collection in G1 16 The Young Generation 17 A Young Collection Pause 18 Object Aging and the Old Generation 19 Humongous Regions 19 A Mixed Collection Pause 22 Collection Sets and Their Importance 24 Remembered Sets and Their Importance 24 Concurrent Marking in G1 GC 30 Stages of Concurrent Marking 34 Evacuation Failures and Full Collection 37 References 38 Chapter 3: Garbage First Garbage Collector Performance Tuning 39 The Stages of a Young Collection 39 Young Generation Tunables 50 Concurrent Marking Phase Tunables 52 A Refresher on the Mixed Garbage Collection Phase 54 The Taming of a Mixed Garbage Collection Phase 56 Avoiding Evacuation Failures 59 Reference Processing 60 References 65 Chapter 4: The Serviceability Agent 67 What Is the Serviceability Agent? 68 Why Do We Need the SA? 68 SA Components 69 SA Binaries in the JDK 69 JDK Versions with Complete SA Binaries 69 How the SA Understands HotSpot VM Data Structures 70 SA Version Matching 71 The Serviceability Agent Debugging Tools 72 Core Dump or Crash Dump Files 108 Debugging Transported Core Files 109 System Properties for the Serviceability Agent 111 Environment Variables for the Serviceability Agent 112 JDI Implementation 113 Extending Serviceability Agent Tools 115 Serviceability Agent Plugin for VisualVM 117 Troubleshooting Problems Using the SA 123 Appendix: Additional HotSpot VM Command-Line Options of Interest 145 Index 155

Product Details

  • publication date: 27/04/2016
  • ISBN13: 9780133796827
  • Format: Paperback
  • Number Of Pages: 192
  • ID: 9780133796827
  • weight: 310
  • ISBN10: 0133796825

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