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Behind the scenes of Bun Install
Learn how Bun is able to cut install times by up to 25×. Bun skips Node.js's overhead with direct system calls, cache-friendly data layouts, OS-level copy-on-write, and full-core parallelism.
In this post we’ll explore what that means: from minimizing syscalls and caching manifests as binary, to optimizing tarball extraction, leveraging OS-native file copying, and scaling across CPU cores. Each time threads coordinate (e.g., when accessing the task queue or signaling back to the event loop), a futex system call can be used to manage locks or waits. npm gave us a foundation to build on, yarn made managing workspaces less painful, and pnpm came up with a clever way to save space and speed things up with hardlinks.
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