JVM Performance Tuning

  1. Profiling, Monitoring, and Tooling
    1. Profiling Fundamentals
      1. Profiling Methodology
        1. Macro-profiling Approach
          1. System-level Monitoring
            1. Resource Utilization
            2. Micro-profiling Approach
              1. Method-level Analysis
                1. Fine-grained Measurements
                  1. Hotspot Identification
                2. Profiling Overhead
                  1. Sampling vs. Instrumentation
                    1. Observer Effect
                      1. Production Profiling Considerations
                      2. Profiling Data Interpretation
                        1. Statistical Significance
                          1. Measurement Accuracy
                            1. Profiling Artifacts
                          2. Types of Profiling
                            1. CPU Profiling
                              1. CPU Usage Analysis
                                1. Thread CPU Time
                                  1. Method Execution Time
                                    1. CPU Hotspot Detection
                                    2. Call Stack Sampling
                                      1. Stack Trace Collection
                                        1. Sample Frequency
                                        2. CPU Profiling Techniques
                                          1. Statistical Sampling
                                            1. Instrumentation-based
                                          2. Memory Profiling
                                            1. Heap Usage Analysis
                                              1. Object Allocation Tracking
                                                1. Memory Leak Detection
                                                  1. Garbage Collection Impact
                                                  2. Memory Allocation Profiling
                                                    1. Allocation Rate
                                                      1. Allocation Patterns
                                                        1. Object Lifecycle
                                                        2. Memory Profiling Tools
                                                          1. Heap Dump Analysis
                                                            1. Allocation Sampling
                                                          2. Thread Profiling
                                                            1. Thread State Analysis
                                                              1. Thread State Transitions
                                                                1. Blocked Thread Detection
                                                                  1. Wait Time Analysis
                                                                  2. Thread Contention Analysis
                                                                    1. Lock Contention
                                                                      1. Synchronization Bottlenecks
                                                                      2. Thread Lifecycle Monitoring
                                                                        1. Thread Creation/Destruction
                                                                          1. Thread Pool Analysis
                                                                        2. I/O Profiling
                                                                          1. File I/O Analysis
                                                                            1. Network I/O Monitoring
                                                                              1. Database Connection Profiling
                                                                            2. JDK Command-Line Tools
                                                                              1. jps (Java Process Status)
                                                                                1. Process Listing
                                                                                  1. JVM Identification
                                                                                    1. Process Monitoring
                                                                                    2. jstat (JVM Statistics)
                                                                                      1. Garbage Collection Statistics
                                                                                        1. GC Performance Metrics
                                                                                          1. Heap Usage Statistics
                                                                                          2. Class Loading Statistics
                                                                                            1. Class Load/Unload Rates
                                                                                              1. Classloader Statistics
                                                                                              2. JIT Compilation Statistics
                                                                                                1. Compilation Metrics
                                                                                                  1. Code Cache Usage
                                                                                                  2. jstat Output Interpretation
                                                                                                  3. jmap (Memory Map)
                                                                                                    1. Heap Dump Generation
                                                                                                      1. Live Object Dumps
                                                                                                        1. Full Heap Dumps
                                                                                                        2. Heap Summary Information
                                                                                                          1. Object Histogram
                                                                                                            1. Memory Usage Analysis
                                                                                                            2. jstack (Stack Trace)
                                                                                                              1. Thread Dump Generation
                                                                                                                1. Stack Trace Analysis
                                                                                                                  1. Deadlock Detection
                                                                                                                    1. Deadlock Identification
                                                                                                                      1. Lock Chain Analysis
                                                                                                                      2. Thread State Analysis
                                                                                                                      3. jinfo (Configuration Info)
                                                                                                                        1. JVM Flag Inspection
                                                                                                                          1. Runtime Flag Values
                                                                                                                            1. Flag Modification
                                                                                                                            2. System Properties
                                                                                                                              1. JVM Configuration Analysis
                                                                                                                              2. jcmd (JVM Command)
                                                                                                                                1. Diagnostic Commands
                                                                                                                                  1. Performance Counters
                                                                                                                                    1. Native Memory Tracking
                                                                                                                                      1. Flight Recorder Control
                                                                                                                                      2. jhsdb (HotSpot Debugger)
                                                                                                                                        1. Core Dump Analysis
                                                                                                                                          1. Live Process Debugging
                                                                                                                                            1. Memory Structure Inspection
                                                                                                                                          2. GUI Monitoring Tools
                                                                                                                                            1. JConsole
                                                                                                                                              1. Real-time JVM Monitoring
                                                                                                                                                1. Memory Usage
                                                                                                                                                  1. Thread Information
                                                                                                                                                    1. CPU Usage
                                                                                                                                                    2. MBean Management
                                                                                                                                                      1. MBean Browser
                                                                                                                                                        1. Attribute Monitoring
                                                                                                                                                          1. Operation Invocation
                                                                                                                                                          2. JConsole Limitations
                                                                                                                                                          3. VisualVM
                                                                                                                                                            1. Application Monitoring
                                                                                                                                                              1. Performance Overview
                                                                                                                                                                1. Memory Analysis
                                                                                                                                                                  1. Thread Analysis
                                                                                                                                                                  2. CPU Profiling
                                                                                                                                                                    1. Method Profiling
                                                                                                                                                                      1. Call Tree Analysis
                                                                                                                                                                      2. Memory Profiling
                                                                                                                                                                        1. Heap Dump Analysis
                                                                                                                                                                          1. Object Allocation
                                                                                                                                                                          2. Plugin Ecosystem
                                                                                                                                                                          3. Java Mission Control (JMC)
                                                                                                                                                                            1. Flight Recorder Integration
                                                                                                                                                                              1. Low-overhead Monitoring
                                                                                                                                                                                1. Event Analysis
                                                                                                                                                                                  1. Performance Analysis
                                                                                                                                                                                    1. JMC Features and Capabilities
                                                                                                                                                                                  2. Java Flight Recorder (JFR)
                                                                                                                                                                                    1. JFR Overview
                                                                                                                                                                                      1. Event-based Profiling
                                                                                                                                                                                        1. Low-overhead Design
                                                                                                                                                                                          1. Continuous Monitoring
                                                                                                                                                                                          2. JFR Event Types
                                                                                                                                                                                            1. JVM Events
                                                                                                                                                                                              1. Application Events
                                                                                                                                                                                                1. Operating System Events
                                                                                                                                                                                                2. JFR Configuration
                                                                                                                                                                                                  1. Recording Profiles
                                                                                                                                                                                                    1. Event Settings
                                                                                                                                                                                                      1. Recording Duration
                                                                                                                                                                                                      2. JFR Data Analysis
                                                                                                                                                                                                        1. Event Timeline
                                                                                                                                                                                                          1. Hot Methods
                                                                                                                                                                                                            1. Memory Allocation
                                                                                                                                                                                                              1. Garbage Collection Events
                                                                                                                                                                                                              2. JFR Custom Events
                                                                                                                                                                                                                1. Event Definition
                                                                                                                                                                                                                  1. Event Generation
                                                                                                                                                                                                                    1. Custom Profiling
                                                                                                                                                                                                                  2. Advanced Profiling Tools
                                                                                                                                                                                                                    1. async-profiler
                                                                                                                                                                                                                      1. Sampling Profiler
                                                                                                                                                                                                                        1. CPU and Memory Profiling
                                                                                                                                                                                                                          1. Flame Graph Generation
                                                                                                                                                                                                                            1. Low-overhead Profiling
                                                                                                                                                                                                                              1. async-profiler Configuration
                                                                                                                                                                                                                              2. Commercial Profilers
                                                                                                                                                                                                                                1. JProfiler
                                                                                                                                                                                                                                  1. Feature Set
                                                                                                                                                                                                                                    1. Profiling Capabilities
                                                                                                                                                                                                                                      1. Integration Options
                                                                                                                                                                                                                                      2. YourKit
                                                                                                                                                                                                                                        1. Profiling Features
                                                                                                                                                                                                                                          1. Performance Analysis
                                                                                                                                                                                                                                            1. Memory Analysis
                                                                                                                                                                                                                                            2. AppDynamics
                                                                                                                                                                                                                                              1. New Relic
                                                                                                                                                                                                                                                1. Profiler Comparison
                                                                                                                                                                                                                                                  1. Feature Matrix
                                                                                                                                                                                                                                                    1. Performance Overhead
                                                                                                                                                                                                                                                      1. Cost Considerations
                                                                                                                                                                                                                                                    2. Open Source Profilers
                                                                                                                                                                                                                                                      1. Eclipse MAT
                                                                                                                                                                                                                                                        1. JVM Monitor
                                                                                                                                                                                                                                                          1. Arthas
                                                                                                                                                                                                                                                        2. Profiling Data Analysis
                                                                                                                                                                                                                                                          1. Heap Dump Analysis
                                                                                                                                                                                                                                                            1. Heap Dump Generation
                                                                                                                                                                                                                                                              1. Automatic Dump Generation
                                                                                                                                                                                                                                                                1. Manual Dump Creation
                                                                                                                                                                                                                                                                2. Heap Dump Tools
                                                                                                                                                                                                                                                                  1. Eclipse MAT
                                                                                                                                                                                                                                                                    1. VisualVM
                                                                                                                                                                                                                                                                      1. JProfiler
                                                                                                                                                                                                                                                                      2. Memory Leak Detection
                                                                                                                                                                                                                                                                        1. Dominator Tree Analysis
                                                                                                                                                                                                                                                                          1. Reference Chain Analysis
                                                                                                                                                                                                                                                                            1. Leak Suspects Report
                                                                                                                                                                                                                                                                            2. Object Retention Analysis
                                                                                                                                                                                                                                                                              1. Retained Size Calculation
                                                                                                                                                                                                                                                                                1. Shallow vs. Retained Size
                                                                                                                                                                                                                                                                              2. Thread Dump Analysis
                                                                                                                                                                                                                                                                                1. Thread Dump Generation
                                                                                                                                                                                                                                                                                  1. Thread State Analysis
                                                                                                                                                                                                                                                                                    1. Runnable Threads
                                                                                                                                                                                                                                                                                      1. Blocked Threads
                                                                                                                                                                                                                                                                                        1. Waiting Threads
                                                                                                                                                                                                                                                                                        2. Deadlock Detection
                                                                                                                                                                                                                                                                                          1. Circular Dependencies
                                                                                                                                                                                                                                                                                            1. Lock Chain Analysis
                                                                                                                                                                                                                                                                                            2. Thread Contention Analysis
                                                                                                                                                                                                                                                                                              1. Synchronization Bottlenecks
                                                                                                                                                                                                                                                                                                1. Lock Wait Times
                                                                                                                                                                                                                                                                                              2. Flame Graph Analysis
                                                                                                                                                                                                                                                                                                1. Flame Graph Types
                                                                                                                                                                                                                                                                                                  1. CPU Flame Graphs
                                                                                                                                                                                                                                                                                                    1. Memory Flame Graphs
                                                                                                                                                                                                                                                                                                      1. Off-CPU Flame Graphs
                                                                                                                                                                                                                                                                                                      2. Flame Graph Interpretation
                                                                                                                                                                                                                                                                                                        1. Stack Trace Visualization
                                                                                                                                                                                                                                                                                                          1. Hotspot Identification
                                                                                                                                                                                                                                                                                                            1. Performance Bottlenecks
                                                                                                                                                                                                                                                                                                            2. Flame Graph Tools
                                                                                                                                                                                                                                                                                                              1. FlameGraph Scripts
                                                                                                                                                                                                                                                                                                                1. Interactive Flame Graphs

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                                                                                                                                                                                                                                                                                                          7. Advanced Performance Topics