Go Garbage Collection: Tri-Color Mark & Sweep, Write Barriers & STW Optimization
The article discusses the evolution of garbage collection in the Go programming language, highlighting its transition from a stop-the-world approach to a concurrent model. It explains the tri-color mark and sweep algorithm introduced in Go 1.5, which allows garbage collection to occur without pausing the application. This improvement addresses latency issues and enhances performance in Go applications.
- ▪Go's garbage collection has evolved significantly since version 1.3.
- ▪The tri-color mark and sweep algorithm allows concurrent garbage collection, reducing application pauses.
- ▪The original mark and sweep method caused significant latency, which was unacceptable for web services.
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| Original publisher | DEV.to (Top) |
| Canonical URL | https://dev.to/jamesli/go-garbage-collection-tri-color-mark-sweep-write-barriers-stw-optimization-50ji |
| Publication time | Tue, 19 May 2026 08:08:07 +0000 |
| Retrieval time | 2026-05-19T08:34:57.460Z |
| Last seen | 2026-05-19T08:34:57.460Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | wQzk-3EZkCKy |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
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| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 2415836) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } James Lee Posted on May 19 Go Garbage Collection: Tri-Color Mark & Sweep, Write Barriers & STW Optimization #algorithms #computerscience #go #performance Go Runtime Internals: Scheduler, Memory, GC & Performance (7 Part Series) 1 Go Performance Optimization: pprof, Flame Graphs & Hotspot Profiling 2 Go Heap Memory Allocation: tcmalloc, Mutator/Allocator & Multi-Level Cache ... 3 more parts...
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