JVM Performance Tuning

  1. Memory Management and Tuning
    1. Memory Architecture Overview
      1. Heap vs. Non-Heap Memory
        1. Memory Allocation Strategies
          1. Memory Management Goals
          2. The Heap Memory Structure
            1. Generational Memory Model
              1. Generational Hypothesis
                1. Age-based Object Classification
                2. Young Generation
                  1. Eden Space
                    1. Object Allocation in Eden
                      1. Eden Space Sizing
                        1. Minor GC Triggers
                        2. Survivor Space 0
                          1. Object Promotion Criteria
                            1. Survivor Space Usage
                            2. Survivor Space 1
                              1. Survivor Space Swapping
                                1. Copy Collection Algorithm
                                2. Young Generation Sizing
                                  1. Impact on GC Frequency
                                    1. Allocation Rate Considerations
                                  2. Old Generation
                                    1. Tenured Space
                                      1. Object Promotion to Old Gen
                                        1. Promotion Thresholds
                                          1. Premature Promotion
                                          2. Full GC Events
                                            1. Full GC Triggers
                                              1. Full GC Impact
                                            2. Heap Sizing Strategies
                                              1. Initial vs. Maximum Heap Size
                                                1. Heap Growth Patterns
                                                  1. Memory Pressure Indicators
                                                2. Non-Heap Memory
                                                  1. Metaspace
                                                    1. Class Metadata Storage
                                                      1. Metaspace Growth Patterns
                                                        1. Metaspace Limits and Thresholds
                                                          1. Metaspace Garbage Collection
                                                          2. Permanent Generation (Legacy)
                                                            1. PermGen Usage Patterns
                                                              1. PermGen OutOfMemoryError
                                                                1. Migration to Metaspace
                                                                2. Code Cache
                                                                  1. JIT-compiled Code Storage
                                                                    1. Code Cache Sizing
                                                                      1. Code Cache Flushing
                                                                        1. Code Cache Monitoring
                                                                        2. Compressed OOPs
                                                                          1. Object Pointer Compression
                                                                            1. Memory Savings
                                                                              1. Performance Impact
                                                                              2. Direct Memory
                                                                                1. Direct ByteBuffer Allocation
                                                                                  1. Off-heap Memory Usage
                                                                                    1. Native Memory Tracking
                                                                                  2. Memory Tuning Parameters
                                                                                    1. Heap Size Configuration
                                                                                      1. Initial Heap Size (-Xms)
                                                                                        1. Maximum Heap Size (-Xmx)
                                                                                          1. Heap Sizing Guidelines
                                                                                            1. Dynamic Heap Sizing
                                                                                            2. Young Generation Tuning
                                                                                              1. NewSize Configuration (-Xmn)
                                                                                                1. NewRatio Setting (-XX:NewRatio)
                                                                                                  1. Survivor Ratio (-XX:SurvivorRatio)
                                                                                                    1. Impact on GC Performance
                                                                                                    2. Metaspace Configuration
                                                                                                      1. MetaspaceSize (-XX:MetaspaceSize)
                                                                                                        1. MaxMetaspaceSize (-XX:MaxMetaspaceSize)
                                                                                                          1. Metaspace Threshold Tuning
                                                                                                          2. Legacy PermGen Settings
                                                                                                            1. PermSize (-XX:PermSize)
                                                                                                              1. MaxPermSize (-XX:MaxPermSize)
                                                                                                            2. Memory Issue Diagnosis
                                                                                                              1. Memory Leaks
                                                                                                                1. Common Leak Patterns
                                                                                                                  1. Static Collection Leaks
                                                                                                                    1. Listener Leaks
                                                                                                                      1. Thread Local Leaks
                                                                                                                      2. Leak Detection Techniques
                                                                                                                        1. Heap Dump Analysis
                                                                                                                          1. Memory Growth Monitoring
                                                                                                                          2. Leak Prevention Strategies
                                                                                                                          3. Excessive Memory Consumption
                                                                                                                            1. Memory Bloat Identification
                                                                                                                              1. Object Retention Analysis
                                                                                                                                1. Memory Usage Optimization
                                                                                                                                2. OutOfMemoryError Analysis
                                                                                                                                  1. Heap Space Errors
                                                                                                                                    1. Heap Exhaustion Causes
                                                                                                                                      1. Heap Dump Generation
                                                                                                                                      2. Metaspace Errors
                                                                                                                                        1. Class Loading Issues
                                                                                                                                          1. Metaspace Exhaustion
                                                                                                                                          2. Direct Memory Errors
                                                                                                                                            1. Direct Buffer Leaks
                                                                                                                                              1. Native Memory Issues
                                                                                                                                              2. GC Overhead Limit Exceeded
                                                                                                                                                1. GC Thrashing
                                                                                                                                                  1. Performance Degradation

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                                                                                                                                            4. Garbage Collection Deep Dive