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bug#33194: 26.1; Auto-revert mode causes emacs to use 100% cpu whenever


From: Justin Van Winkle
Subject: bug#33194: 26.1; Auto-revert mode causes emacs to use 100% cpu whenever a file is being written to in the home directory
Date: Mon, 29 Oct 2018 17:13:22 -0400

Hi Michael,

It was outside of emacs.  SCP would trigger the cpu usage in emacs, rsync would not (oddly).  Both "cat /dev/zero > somefile"  and "dd if=/dev/zero of=somefile" would trigger it if somefile was in my $HOME directory, but none of these would trigger it if I did it in, for example, $HOME/Downloads/

I am pretty sure I can reproduce this at will if you need.

- Justin

On Mon, Oct 29, 2018 at 4:27 PM Michael Albinus <address@hidden> wrote:
Justin Van Winkle <address@hidden> writes:

Hi Justin,

> I enable global-auto-revert-mode.  I noticed that when I was scp'ing a
> large file to my home directory, every emacs process on my machine was
> trying to use 100% cpu.  When I stopped the file transfer, emacs would
> go back to idle cpu usage.  I ran the emacs profiler and narrowed it
> down to revert-buffer.  Auto revert was apparently listening for
> changes in my home directory, even for things like file creation or
> file modified for files emacs did not have open.

How did you "scp'ing a large file"? Inside Emacs, using Tramp, or
outside Emacs?

Best regards, Michael.

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