The Silent Killers of Go Concurrency: Mutexes, Semaphores, and Goroutine Leaks
The article discusses common concurrency issues in Go programming, particularly focusing on mutexes and semaphores. It highlights how improper use of locks can lead to performance bottlenecks, making concurrent systems behave like single-threaded applications. The author provides examples and solutions to improve concurrency management in production environments.
- ▪Concurrency problems in Go often arise from misunderstanding bottlenecks rather than from a lack of concurrency.
- ▪Excessive locking and holding locks for too long can create performance issues, even if CPU usage appears normal.
- ▪Separating shared-state mutation from slow external operations can significantly improve performance in concurrent applications.
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Record
| Original publisher | DEV.to (Top) |
| Canonical URL | https://dev.to/amirsefati/the-silent-killers-of-go-concurrency-mutexes-semaphores-and-goroutine-leaks-177i |
| Publication time | Sun, 24 May 2026 17:15:55 +0000 |
| Retrieval time | 2026-05-24T17:37:33.788Z |
| Last seen | 2026-05-24T17:37:33.788Z |
| 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 | LVg7ozbKW5Ws |
| 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 |
Rights status (four layers)
WeSearch handling by dimension
| 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 === 161199) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } amir Posted on May 24 The Silent Killers of Go Concurrency: Mutexes, Semaphores, and Goroutine Leaks #go #concurrency #performance #backend Go makes concurrency look simple. You write: go func() { // do something concurrently }() Enter fullscreen mode Exit fullscreen mode And suddenly your code is running in another goroutine. That simplicity is one of the reasons I like Go so much.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at DEV.to (Top).
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