On Wed, Nov 18, 2020 09:13:54 +0000, Gargoyle wrote: > I've just made the switch from Ubuntu to Fedora 33 for my main desktop > system. Of the few teething problems I am going through, the initial 8192 > limit for fs.inotify.max_user_watches was probably causing the most side > effects. As a developer, I pretty much have netbeans open all day and am > forever tailing log files, so I hit this problem pretty much straight away. > > After some digging around I found a script to list the current count of > watchers per process. The half-dozen worst offenders were:- > > INOTIFY > WATCHER > COUNT PID CMD > ---------------------------------------- > 4903 4620 /data/Applications/java/jdk-15/bin/java > -Djdk.home=/data/Applications/java/jdk-15 -classpath > /data/Applications/netbeans > 3573 3032 /usr/libexec/tracker-miner-fs-3 > 64 2022 /usr/lib/systemd/systemd --user > 47 2663 /usr/libexec/gsd-xsettings > 27 34846 /usr/share/atom/atom --type=renderer > --enable-experimental-web-platform-features > --field-trial-handle=123480363484759119 > 18 2812 /usr/bin/gnome-software --gapplication-service > > So netbeans + tracker-miner had pretty much consumed the entire pool within > an hour of starting the system. > > I've bumped the figure up to 65K by adding an entry to /etc/sysctl.conf and > asked on #fedora if anyone knew of the side effects of having a high number > - the only answers found were that approx 1K of unswapable kernel memory is > used per watcher. So this increase only puts an additional 57MB of such > memory usage onto my system. > > Are there any other side effects of this to worry about? > > If not, then perhaps the default should be significantly increased with the > aim of removing the problem for new users with modern desktop/laptop > machines which probably have 4GB+ RAM. I've not rebooted my machine > overnight and netbeans is now up to 13,000 watches and tracker-miner upto > 4,500. So in less than 24 hours I have exceeded 16K watches. > > Perhaps an new default value in the region of 32K - 64K would be more > appropriate? To add: Dropbox users often run into this issue, which has interesting side effects, like PDF readers not updating when the file is changed: https://ask.fedoraproject.org/t/pdf-readers-stops-doing-automatic-refresh-on-file-change/9537 -- Thanks, Regards, Ankur Sinha "FranciscoD" (He / Him / His) | https://fedoraproject.org/wiki/User:Ankursinha Time zone: Europe/London
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