Trash Talk - Exploring the memory management in the JVM
summary
Covers concrete JVM behavior: mark‑and‑sweep, copy and compact strategies, and generational collection with Eden/survivor/old regions; lists collectors with tradeoffs — Serial for single‑core/small heaps, Parallel for throughput, CMS deprecated and removed; shows numbers and anecdotes — G1 is default since JDK9 and targets ~100–200ms pauses, while ZGC advertises max ~15ms (often <1ms) but needs very large heaps and CPU and caused ~3% perf tradeoffs at Netflix
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chapters (18)
- 0:00JVM memory management intro
- 4:32How GC works in JVM
- 8:31Precise GC phases
- 10:11Mark and sweep GC
- 12:11Mark-compact vs copy collectors
- 15:41Generational GC principles
- 20:03JVM GC overview
- 21:47Serial collector use cases
- 23:43Parallel GC for throughput
- 25:41Concurrent Mark and Sweep collector
- 28:02G1 GC regions
- 31:57Epsilon no-op GC
- 33:29Shenandoah generational
- 34:12ZGC low-latency
- 35:41Zing C4 colored pointers
- 39:35Choosing the right GC
- 41:52Tuning vs switching GC
- 43:20Summary and Q&A
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