How JVM Card Tables Boost GC Efficiency and Solve Cross-Generation References

The article explains why JVMs use generational garbage collection, how cross‑generation references cause missed objects during Minor GC, and how the card table together with write barriers and conditional marking dramatically reduces pause times and improves overall GC performance.

Card TableGarbage CollectionJVM

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How JVM Card Tables Boost GC Efficiency and Solve Cross-Generation References

Lobster Programming

Jan 2, 2025 · Fundamentals

How Card Tables Optimize Cross‑Generational GCRoot Scanning in Java HotSpot

This article explains how Java HotSpot uses a card‑table memory set to efficiently detect and handle cross‑generational references during young‑generation GCRoot scans, avoiding full old‑generation scans and significantly improving garbage‑collection performance.

Card TableCross-Generational ReferencesGarbage Collection

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How Card Tables Optimize Cross‑Generational GCRoot Scanning in Java HotSpot