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Tencent Technical Engineering

Mar 24, 2025 · Fundamentals

Understanding V8 Garbage Collection: Scavenger and Mark‑and‑Sweep Algorithms

V8’s garbage collector splits memory into young and old generations, using a fast Scavenger minor‑GC that marks live objects, evacuates them via semi‑space copying, and updates pointers with write barriers, while a concurrent mark‑and‑sweep major‑GC employs three‑color marking, black allocation, sweeping and optional parallel compaction, with adaptive triggering based on heap usage.

Garbage CollectionJavaScriptMark and Sweep

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Understanding V8 Garbage Collection: Scavenger and Mark‑and‑Sweep Algorithms

Xueersi Online School Tech Team

Dec 24, 2021 · Fundamentals

Evolution of Garbage Collection in Go: From Mark‑Sweep to Hybrid Write Barriers

This article explains how Go's garbage collection has progressed from the simple stop‑the‑world mark‑and‑sweep algorithm in Go 1.3, through the tri‑color concurrent marking with insert and delete write barriers in Go 1.5, to the hybrid write‑barrier approach introduced in Go 1.8 that dramatically reduces pause times while preserving memory safety.

Garbage CollectionGoMark and Sweep

0 likes · 31 min read

Evolution of Garbage Collection in Go: From Mark‑Sweep to Hybrid Write Barriers