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Dmitry Vyukov — Go scheduler: Implementing language with lightweight concurrency

Hydra · 46.9K views · 2019-10-14 · 1:00:40

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Overview

Go runtime contributor Dmitry Vyukov looks inside the Go scheduler, explaining how goroutines and channels are implemented. He covers the main scheduler components and overall operation, then goes into details such as preemption and stacks.

On Hacker News

Recommended as a good watch on how Go's M:N:P scheduler works and why it was designed that way compared with alternative schemes.

Recommended by 2 HN people across 2 months · HN mentions 2020–2026

Topics

C, C++, Rust, Go & systems languagesCompilers, interpreters & program analysisSoftware performance & optimization
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golanggoroutinesconcurrencyschedulingpreemptionruntime

What people said

c0balt · 2026-03 · Recommendation

[VIDEO] - Dmitry Vyukov — Go scheduler: Implementing language with lightweight concurrency This one notably also explains the design considerations for golangs M:N:P in comparison to other schemes and which specific challenges it tries to address.

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RossBencina · 2020-02 · Recommendation

I guess that's because they are "intros," and often multi-core event loops are implemented by the language runtime or some threadpool library. This is a good watch: Dmitry Vyukov — Go scheduler: Implementing language with lightweight concurrency (Oct 14, 2019) [VIDEO]

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lukaslalinsky · 2025-10 · Reference

Go depends on the fact that it can track all pointers, and when it needs to resize stacks, it can update them. Previous versions of Go used segmented stacks, which are theoretically possible, if Zig really wanted (would need compiler support), but they have nasty performance side-effects, see [VIDEO]

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Sources

Video by Hydra, played through YouTube.

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