syncthing / syncthing/syncthing-macos

Constant but low CPU usage of 0,5% on macOS Sonoma with Syncthing v1.27.3-1

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enhancement help wanted macos-14
Dominant language
Objective-C
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Merged PRs (30d)
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Description

It seems strange to me that syncthing is always using some amount of CPU on my Mac, no matter if no other devices are connected or even if I stop the local service. The usage is low but never goes down to zero. There is no GUI components other than the icon at top bar. I've disabled the FS watcher for the only shared folder.

For example:

image
  1. No other device is connected.
  2. The local service is stopped (the top bar menu shows Unavailable).
  3. The web GUI is closed.
  4. Sync for the only shared folder was paused before stopping the service.

It's not a lot, but it's in the top-10 of %CPU on Activity Monitor open in an empty desktop for some minutes.

For an app that's doing nothing it seems a bit high. Weird at least.

Synthing 1.27.3-1
macOS Sonoma

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Research direction

No source files, tests, or entry points are mentioned. Reproduce the report in macOS Sonoma with Syncthing v1.27.3-1 under the listed stopped-service conditions, then trace which remaining app component accounts for CPU use; done means the cause is identified and the idle usage is addressed or explained.

Written by the indexing model from the issue text.

Assessment

Tech stack
macos, objective-c
Domain
desktop, performance
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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