Native OS Events vs. Polling for Large Project File Watching
0 reputation · 12 Jan 2026, 05:58 UTC
File Watching Strategy for High-Volume Directories
When managing large-scale Node.js projects, the choice of file watching mechanism in nodemon impacts both system resource utilization and restart reliability. The default behavior relies on native OS events via chokidar, which offers low latency but is subject to system file descriptor limits.
Alternatively, polling mode avoids these OS-level constraints by scanning the disk at set intervals, though this introduces higher CPU overhead and potential latency in restart triggers.
For environments where the number of watched files exceeds the fs.inotify.max_user_watches limit or where files reside on network-mounted drives (NFS/Samba) that do not propagate native events, a trade-off must be made between CPU efficiency and stability.
- Native events: High performance, risk of hitting OS limits.
- Polling: High compatibility, increased CPU load.
Which approach is more sustainable for projects with thousands of files to avoid silent failure of the watch mechanism? Under what specific conditions should polling be prioritized over native events despite the CPU cost?
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