JVM Performance Tuning

  1. Advanced Performance Topics
    1. Threading and Concurrency Performance
      1. Thread Management
        1. Thread Creation Overhead
          1. Thread Pool Sizing
            1. Core Pool Size
              1. Maximum Pool Size
                1. Queue Capacity
                  1. Keep-alive Time
                  2. Thread Pool Types
                    1. Fixed Thread Pool
                      1. Cached Thread Pool
                        1. Scheduled Thread Pool
                          1. Work-stealing Pool
                        2. Thread State Analysis
                          1. Thread State Transitions
                            1. New State
                              1. Runnable State
                                1. Blocked State
                                  1. Waiting State
                                    1. Timed Waiting State
                                      1. Terminated State
                                      2. Thread State Monitoring
                                        1. Thread State Optimization
                                        2. Synchronization Performance
                                          1. Lock Contention Analysis
                                            1. Contention Hotspots
                                              1. Lock Wait Times
                                                1. Throughput Impact
                                                2. Synchronization Alternatives
                                                  1. Lock-free Data Structures
                                                    1. Atomic Operations
                                                      1. Compare-and-swap
                                                      2. Lock Optimization
                                                        1. Lock Granularity
                                                          1. Lock Ordering
                                                            1. Lock-free Algorithms
                                                          2. Biased Locking
                                                            1. Biased Locking Mechanism
                                                              1. Biased Locking Benefits
                                                                1. Biased Locking Overhead
                                                                  1. Biased Locking Configuration
                                                                    1. UseBiasedLocking Flag
                                                                      1. BiasedLockingStartupDelay
                                                                    2. Thread-local Storage
                                                                      1. ThreadLocal Performance
                                                                        1. ThreadLocal Memory Leaks
                                                                          1. ThreadLocal Alternatives
                                                                        2. Application Startup Performance
                                                                          1. Startup Time Analysis
                                                                            1. Startup Phase Breakdown
                                                                              1. Startup Bottlenecks
                                                                                1. Cold Start vs. Warm Start
                                                                                2. Class Loading Optimization
                                                                                  1. Class Loading Performance
                                                                                    1. Lazy Class Loading
                                                                                      1. Class Preloading
                                                                                        1. ClassLoader Optimization
                                                                                        2. Class Data Sharing (CDS)
                                                                                          1. CDS Overview
                                                                                            1. CDS Archive Creation
                                                                                              1. CDS Usage Benefits
                                                                                                1. CDS Configuration
                                                                                                2. Application Class-Data Sharing (AppCDS)
                                                                                                  1. AppCDS Benefits
                                                                                                    1. Custom Archive Creation
                                                                                                      1. AppCDS Deployment
                                                                                                        1. AppCDS Limitations
                                                                                                        2. Ahead-of-Time Compilation
                                                                                                          1. AOT Compilation Process
                                                                                                            1. AOT Benefits and Limitations
                                                                                                              1. GraalVM Native Image
                                                                                                                1. AOT Configuration
                                                                                                                2. JVM Warmup Strategies
                                                                                                                  1. Warmup Techniques
                                                                                                                    1. Warmup Automation
                                                                                                                      1. Production Warmup
                                                                                                                    2. Native Memory Management
                                                                                                                      1. Native Memory Tracking (NMT)
                                                                                                                        1. NMT Overview
                                                                                                                          1. Enabling NMT
                                                                                                                            1. NativeMemoryTracking Flag
                                                                                                                              1. NMT Overhead
                                                                                                                              2. NMT Categories
                                                                                                                                1. Java Heap
                                                                                                                                  1. Class Metadata
                                                                                                                                    1. Thread Stacks
                                                                                                                                      1. Code Cache
                                                                                                                                        1. GC Memory
                                                                                                                                          1. Compiler Memory
                                                                                                                                            1. Internal Memory
                                                                                                                                            2. NMT Analysis
                                                                                                                                              1. Memory Usage Breakdown
                                                                                                                                                1. Memory Growth Tracking
                                                                                                                                                  1. Memory Leak Detection
                                                                                                                                                2. Direct Memory Management
                                                                                                                                                  1. Direct ByteBuffers
                                                                                                                                                    1. Off-heap Memory Usage
                                                                                                                                                      1. Direct Memory Limits
                                                                                                                                                        1. Direct Memory Monitoring
                                                                                                                                                        2. Native Memory Leaks
                                                                                                                                                          1. JNI Memory Leaks
                                                                                                                                                            1. Native Library Leaks
                                                                                                                                                              1. Memory Leak Detection
                                                                                                                                                            2. Performance Anti-patterns
                                                                                                                                                              1. Object Creation Anti-patterns
                                                                                                                                                                1. Excessive Object Creation
                                                                                                                                                                  1. Temporary Object Overhead
                                                                                                                                                                    1. Allocation Pressure
                                                                                                                                                                    2. Object Pooling
                                                                                                                                                                      1. When to Use Object Pools
                                                                                                                                                                        1. Pool Implementation
                                                                                                                                                                          1. Pool Sizing
                                                                                                                                                                          2. Avoiding Unnecessary Objects
                                                                                                                                                                            1. String Optimization
                                                                                                                                                                              1. Collection Optimization
                                                                                                                                                                                1. Primitive Wrappers
                                                                                                                                                                              2. Synchronization Anti-patterns
                                                                                                                                                                                1. Over-synchronization
                                                                                                                                                                                  1. Unnecessary Locking
                                                                                                                                                                                    1. Lock Granularity Issues
                                                                                                                                                                                    2. Synchronized Method Overuse
                                                                                                                                                                                      1. Double-checked Locking
                                                                                                                                                                                        1. Synchronization Alternatives
                                                                                                                                                                                        2. Memory Management Anti-patterns
                                                                                                                                                                                          1. Memory Leaks
                                                                                                                                                                                            1. Static Collection Leaks
                                                                                                                                                                                              1. Listener Registration Leaks
                                                                                                                                                                                                1. ThreadLocal Leaks
                                                                                                                                                                                                2. Finalizer Usage
                                                                                                                                                                                                  1. Finalizer Overhead
                                                                                                                                                                                                    1. Finalizer Queue Buildup
                                                                                                                                                                                                      1. Alternatives to Finalizers
                                                                                                                                                                                                    2. String Handling Anti-patterns
                                                                                                                                                                                                      1. String Concatenation in Loops
                                                                                                                                                                                                        1. StringBuilder Usage
                                                                                                                                                                                                          1. StringBuffer vs. StringBuilder
                                                                                                                                                                                                          2. String Interning Misuse
                                                                                                                                                                                                            1. Regular Expression Compilation
                                                                                                                                                                                                            2. Collection Anti-patterns
                                                                                                                                                                                                              1. Wrong Collection Choice
                                                                                                                                                                                                                1. Collection Sizing Issues
                                                                                                                                                                                                                  1. Iterator Performance
                                                                                                                                                                                                                    1. Collection Synchronization
                                                                                                                                                                                                                    2. I/O Anti-patterns
                                                                                                                                                                                                                      1. Unbuffered I/O
                                                                                                                                                                                                                        1. Resource Leaks
                                                                                                                                                                                                                          1. Blocking I/O in Event Loops
                                                                                                                                                                                                                        2. JVM Flags and Configuration
                                                                                                                                                                                                                          1. JVM Flag Categories
                                                                                                                                                                                                                            1. Standard Flags
                                                                                                                                                                                                                              1. Non-standard (-X) Flags
                                                                                                                                                                                                                                1. Experimental (-XX) Flags
                                                                                                                                                                                                                                  1. Diagnostic Flags
                                                                                                                                                                                                                                  2. Flag Management
                                                                                                                                                                                                                                    1. Flag Discovery
                                                                                                                                                                                                                                      1. Flag Validation
                                                                                                                                                                                                                                        1. Flag Documentation
                                                                                                                                                                                                                                          1. Flag Deprecation
                                                                                                                                                                                                                                          2. Configuration Best Practices
                                                                                                                                                                                                                                            1. Environment-specific Configuration
                                                                                                                                                                                                                                              1. Configuration Management
                                                                                                                                                                                                                                                1. Configuration Testing

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                                                                                                                                                                                                                                            1. Introduction to JVM Performance