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bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode


From: Mattias Engdegård
Subject: bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
Date: Sun, 5 Jan 2020 20:57:42 +0100

5 jan. 2020 kl. 20.31 skrev Peter Ludemann <peter.ludemann@gmail.com>:

> Which version of Emacs would you like me to try this with? And what result 
> are you expecting/hoping to see? (e.g., might it reduce the current 30-80% 
> CPU load for polling with emacs 28.0.50?) There are only a few open files 
> directly under /tmp, so would this have any effect or does it propagate down 
> to subdirectories?
> 
> [Also, I'd need a few more details (not being an emacs-internals person) ... 
> should I add this to my .emacs and restart, or execute in a scratch buffer, 
> or ...?]

'auto-revert-avoid-polling' is a single global customisable variable, so you 
would set it using

 M-x customise-variable RET auto-revert-avoid-polling RET

, then turn it on and apply the change. I believe it was introduced in Emacs 27.

The idea is to save CPU by not having to look at files periodically to see if 
they have changed. I have no idea if you would see any improvement at all, but 
it shouldn't make anything worse.






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