JVM Performance Tuning

  1. Just-In-Time Compilation
    1. JIT Compilation Overview
      1. Interpretation vs. Compilation
        1. Execution Model Trade-offs
          1. Startup vs. Peak Performance
          2. Adaptive Optimization
            1. Profile-guided Optimization
              1. Speculative Optimization
                1. Deoptimization Mechanisms
              2. HotSpot Detection
                1. Method Profiling
                  1. Invocation Counters
                    1. Backedge Counters
                      1. Profiling Overhead
                      2. Compilation Thresholds
                        1. CompileThreshold Parameter
                          1. Tier Thresholds
                            1. Threshold Adjustment
                            2. Hot Method Identification
                              1. Method Hotness Criteria
                                1. Compilation Queues
                              2. Tiered Compilation
                                1. Compilation Levels
                                  1. Level 0 (Interpreter)
                                    1. Level 1 (C1 Simple)
                                      1. Level 2 (C1 Limited Profile)
                                        1. Level 3 (C1 Full Profile)
                                          1. Level 4 (C2 Optimized)
                                          2. Compilation Transitions
                                            1. Level Progression
                                              1. Deoptimization Triggers
                                              2. Tiered Compilation Benefits
                                                1. Faster Startup
                                                  1. Better Peak Performance
                                                    1. Adaptive Optimization
                                                    2. Tiered Compilation Configuration
                                                      1. TieredCompilation Flag
                                                        1. Tier Thresholds
                                                      2. JIT Optimization Techniques
                                                        1. Method Inlining
                                                          1. Inlining Criteria
                                                            1. Method Size Limits
                                                              1. Call Frequency
                                                                1. Type Stability
                                                                2. Inlining Benefits
                                                                  1. Reduced Call Overhead
                                                                    1. Increased Optimization Scope
                                                                    2. Inlining Limitations
                                                                      1. Code Size Growth
                                                                        1. Compilation Time
                                                                      2. Escape Analysis
                                                                        1. Object Escape Detection
                                                                          1. Stack Allocation
                                                                            1. Scalar Replacement
                                                                              1. Object Elimination
                                                                              2. Lock Elimination
                                                                                1. Escape Analysis Limitations
                                                                                2. Loop Optimizations
                                                                                  1. Loop Unrolling
                                                                                    1. Loop Peeling
                                                                                      1. Loop Invariant Code Motion
                                                                                        1. Vectorization
                                                                                        2. Branch Prediction
                                                                                          1. Profile-guided Optimization
                                                                                            1. Branch Probability
                                                                                              1. Speculative Execution
                                                                                              2. Dead Code Elimination
                                                                                                1. Unreachable Code Removal
                                                                                                  1. Unused Variable Elimination
                                                                                                  2. Constant Folding
                                                                                                    1. Compile-time Evaluation
                                                                                                      1. Constant Propagation
                                                                                                    2. Code Cache Management
                                                                                                      1. Code Cache Structure
                                                                                                        1. Non-method Code
                                                                                                          1. Profiled Code
                                                                                                            1. Non-profiled Code
                                                                                                            2. Code Cache Sizing
                                                                                                              1. ReservedCodeCacheSize
                                                                                                                1. InitialCodeCacheSize
                                                                                                                  1. Code Cache Monitoring
                                                                                                                  2. Code Cache Flushing
                                                                                                                    1. Flushing Triggers
                                                                                                                      1. Flushing Impact
                                                                                                                        1. Flushing Prevention
                                                                                                                        2. Segmented Code Cache
                                                                                                                          1. Code Cache Segments
                                                                                                                            1. Segment Management
                                                                                                                          2. Deoptimization
                                                                                                                            1. Deoptimization Triggers
                                                                                                                              1. Assumption Violations
                                                                                                                                1. Class Loading Events
                                                                                                                                  1. Uncommon Traps
                                                                                                                                  2. Deoptimization Process
                                                                                                                                    1. Stack Frame Reconstruction
                                                                                                                                      1. Interpreter Fallback
                                                                                                                                      2. Deoptimization Impact
                                                                                                                                        1. Performance Penalties
                                                                                                                                          1. Recompilation Costs
                                                                                                                                          2. Deoptimization Analysis
                                                                                                                                            1. Deoptimization Events
                                                                                                                                              1. Uncommon Trap Statistics
                                                                                                                                            2. JIT Compilation Monitoring
                                                                                                                                              1. Compilation Logging
                                                                                                                                                1. PrintCompilation Flag
                                                                                                                                                  1. Compilation Log Analysis
                                                                                                                                                  2. JIT Compilation Metrics
                                                                                                                                                    1. Compilation Time
                                                                                                                                                      1. Compilation Queue Length
                                                                                                                                                        1. Method Compilation Statistics
                                                                                                                                                        2. JIT Performance Analysis
                                                                                                                                                          1. Hot Method Identification
                                                                                                                                                            1. Compilation Bottlenecks
                                                                                                                                                              1. Optimization Effectiveness

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                                                                                                                                                          4. Garbage Collection Deep Dive

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                                                                                                                                                          6. Profiling, Monitoring, and Tooling