What is fseventsd?

fseventsd is a quietly important process that many macOS features rely on.

What is fseventsd?

fseventsd stands for "File System Events daemon". It watches and records every change to the file system. Every file created, changed, deleted, or renamed gets logged. This lets other programs ask "what changed?" without scanning the whole disk.

What uses it?

Many key macOS features depend on fseventsd:

• Spotlight: knows which files to re-index because fseventsd reports what changed
• Time Machine: works out which files to back up since the last backup
• Finder: updates folder contents in real time
• iCloud Drive: spots local file changes that need syncing
• Xcode: watches for file changes in your project
• Development tools: file watchers like webpack and nodemon use the same system

Where does it store events?

fseventsd writes event logs to a hidden .fseventsd folder at the root of each volume. These logs are small. They record what changed, not the file contents.

Does it use many resources?

Normally very little. It can get busier during large file operations, such as copying thousands of files or unpacking a big archive. If you see it using lots of processor time for a long stretch, some other process may be creating and changing files nonstop.

Can you turn it off?

You should not. Without fseventsd, Spotlight, Time Machine, iCloud Drive syncing, and many development tools would break.

Should you worry?

No. It is a basic macOS process. It is the reason Time Machine backups are fast (it knows exactly what changed) and why Spotlight stays up to date.

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