On Wed, Nov 18, 2020 at 10:49 AM Ankur Sinha <sanjay.ankur@xxxxxxxxx> wrote: > > 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 This is also an issue for syncthing when inotify support is enabled for sync'ed folders. I had to bump that setting to "fs.inotify.max_user_watches=204800" on my main machine because otherwise it ran out of file watches really really quickly. I think bumping it to 2^16 would be a good default value to make sure most users don't bump against the really low 8K limit ... Fabio _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx
