Java Performance Tuning

Understanding Virtual Memory NIO

• Java New IO Package
  • Motivation for Using
  • Working with Buffers
  • Allocating Buffers
  • Buffers Advantages
  • Channels
  • Memory Mapped Files
  • Non-Blocking Operations
  • Selectors
  • NIO Uses
    • Event Driven Architecture
• Character Streams Encoding
  • The Unicode Standard
  • Forms of Unicode
  • 32-bit Characters
  • Big / Little Endian
  • Other Encodings
  • Other Charsets - ISO 8859
  • Charset Class
  • Encoders and Decoders
  • Code Points

NIO 2.0

• Working with path
• Metadata File Attributes
• Symbolic Links
• File and Directories
• FileVisitor Class
• Watch Service API
  • Two Security models
  • SPI Package
• File System Change Notification
• Multicasting
• Asynchronous IO with Socket and File

Garbage Collection and Memory Architecture

• Overview
• Generational Spaces
• GC Tasks
• Heap Fragmentation
• GC Pros and Cons
• Algorithms
• Reachability
• History
  • JVM 1.4, 5, 6
  • Young Space
  • Old Space
  • Summary
• Measuring GC Activity
• Performance
• Object Size
• Managing OutOfMemoryError

Reference Objects

• Reference Objects
• Object Reachability
• Using References
• SoftReference
• WeakReference
• PhantomReference
• Abstracting
• ReferenceQueue
• WeakHashMap
• SoftHashMap
  • Performance Implications

Garbage Collection and Performance Tips

• Programming Tips
• Problems with Finalization
• Reference Objects
• Object Allocation
• Object Pooling
• Large Object of different sizes

Common Tuning Options

• Be aware of Ergonomic settings
• Heap sizing
• GC policy
• Other tuning parameters
• Tuning for throughput
• Tuning for Low pause time

Advance Tuning Scenarios

• GC Tuning
  • Tuning the young generation
  • Tuning Parallel GC
  • Tuning CMS
• Monitoring the GC
• Conclusions

JMX

• Introduction
• Standard Mbeans
• Dynamic Mbeans
• Model Mbean
• Open Mbean
• JMX Remoting
• Advanced Features
• J2EE Management(optional)

Profiling Tools
Profiling Java SE Memory

• Memory profiling tools
• Heap profiling strategies
• Memory leak profiling strategies
• Generation count
• When to use what tools?
• Identifying problem memory usage patterns

Profiling with Netbeans or VisualVM

• Issues with Traditional Profiling Schemes
• Introduction (of NetBeans profiler)
• Architecture and Technologies used
• Features
• What is new in NetBeans Profiler 6.x?

Profiling Using Eclipse TPTP

• Objectives
• Project Structure
• Architecture
• Architecture Components
• Agent Controller

Performance Programming Tips

• Primitive and Objects
• Abuse of the String class
• Creating intermediate objects
• Mutable return types
• Wrong collections
• Array copy

JVM Architecture and Dynamic Compilation

• Dynamic Compilation
• Code Hoisting
• Dead Code Elimination
• Biased locking
• Loop unrolling
• Aggressive Inlining
• Data Flow analysis
• OSR
• Server VM
• Client VM

Advanced JVM Architecture

• Virtual Machine Design
• Dynamic Compilation
• VM Philosophy
• Virtual method calls Details
• Inlining Details
• Speculative Optimizations
• Standard Compiler Optimizations
• Scalar Replacements
• Escape Analysis
• Lock Coarsening
• Biased Locking
• Inline caching
• Large Pages
• NUMA