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This article explains the internal mechanisms of JVM garbage collection, covering oopMap, safepoints, saferegions, three‑color marking, memory sets, write barriers, and the design of low‑latency collectors such as Shenandoah and ZGC, and provides practical tuning advice.
Java 21, slated for release on September 19, 2023 as the next LTS version after Java 17, will drop the experimental Generational Shenandoah garbage‑collector feature during its Ramp‑down phase due to insufficient readiness, with the change slated for removal by the June 14 review deadline.
This article explains how Shenandoah OpenJDK's new concurrent thread‑stack processing, introduced in JDK 17, dramatically reduces garbage‑collection pause times to sub‑millisecond levels by using stack watermarks, and provides practical configuration guidance and benchmark results.
This article examines the evolution and classification of HotSpot JVM garbage collectors, explaining the performance triangle of heap usage, throughput and pause time, and detailing generational, region‑based, and low‑latency collectors such as G1, Shenandoah, and ZGC with their design principles and benchmark results.