Points of Contact: Java & GC
summary
Explains how Java applications interact with the garbage collector: mechanisms that implement Stop-the-World (STW), the concepts of safepoints and checkpoints, which threads are stopped vs allowed to run, how GC discovers objects, and how application threads observe GC-made changes. Then covers concurrent GC barriers: what barriers are, how they are injected into code (example from the interpreter), detailed examples of read and pre-write barriers used for concurrent marking, JVM developers’ optimizations such as colored pointers and self-healing, and a comparison of STW versus concurrent approaches.
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chapters (6)
- 0:00Introduction
- 1:23Java and garbage collector
- 17:10Barriers in concurrent mode
- 31:45Barrier costs and optimizations
- 40:29Stop-the-world vs concurrent GC
- 43:40Q&A
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