Garbage Collection

Core Topics

GC Algorithms

• Serial GC
• Parallel GC
• CMS (Concurrent Mark Sweep)
• G1 (Garbage-First)
• ZGC
• Shenandoah

GC Phases

• Mark
• Sweep
• Compact

Generational Hypothesis

• Young Generation (Eden, Survivor spaces)
• Old Generation
• Generational collection benefits

GC Tuning Parameters

• Heap size configuration
• GC algorithm selection
• Pause time goals

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Key Internals to Understand

• Generational GC benefits
• Stop-the-world pauses
• Memory leaks in Java
• GC logging and analysis

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Notes