⚙️ DevOps & Platform Eng

Bun's Linux Containers Finally Report Real CPU Limits

Bun just plugged a massive blind spot in container CPU reporting. Your Node-like apps in Docker now see the actual limits, not the host's full arsenal.

DevTools Feed Apr 03, 2026 3 min read
Bun runtime logo overlayed on Linux cgroup CPU quota diagram in a Docker container

⚡ Key Takeaways

  • Bun now respects Linux cgroup cpu.max for accurate hardwareConcurrency in containers.
  • Fixes oversubscribed threads in Docker/k8s, boosting efficiency.
  • Unique edge: Echoes 2000s VM CPU billing scandals, pushing runtime maturity.
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#bun #cgroups #containers #hardwareconcurrency #linux

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Originally reported by Hacker News

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