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bug#43389: 28.0.50; Emacs memory leaks using hard disk all time

From: Trevor Bentley
Subject: bug#43389: 28.0.50; Emacs memory leaks using hard disk all time
Date: Sat, 28 Nov 2020 18:49:37 +0100

Eli Zaretskii <eliz@gnu.org> writes:

Just to see if we have some problem there, I left an otherwise idle Emacs with 20 timer functions firing every second run overnight. It gained less than 1MB of memory footprint after 10 hours. So timers alone cannot explain the dramatic increase in memory footprints described in this bug report, although they might be a contributing factor when the Emacs process already has lots of memory allocated to it.

Something else worth noting is that I have dozens and dozens of emacs processes running at all times, and only graphical X11 clients have had memory explosion. Plenty of my `emacs -nw` instances have been open for 30+ days with heavy use, and all have stayed under 100MB RSS.

The most recent instance I ran is a graphical instance that I haven't done anything in except scroll around in a single small elisp file. This one has an interesting difference in memory usage: the usage is large (2GB heap), but it isn't growing on its own. It seems to grow by 10-20MB every time it gets X11 window focus, and other than that it's stable. If I alt-tab to it continuously, I can force its usage up. It appears to be permanent. This differs from my emacs-slack instances, which constantly grow even when backgrounded.

I have yet another graphical instance that I just opened and minimized, and never focus. It's still only using 70MB after over a week. So at least it's not simply leaking all the time... some active use has to trigger it.

I'll have an mtrace for you from the current experiment (X11 focus leak) tomorrow or Monday. I hope it's the same issue.


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