shared/docs/linux-dev.md
If it seems like hot reloading or anything that depends on
file-watching isn't working on Linux, you're probably running into
inotify limits. As a quick check, try doing
tail -f (some file)
If you get
tail: inotify cannot be used, reverting to polling: Too many open files
then that's a telltale sign of running out of inotify watches. For more details, do (in bash)
echo "pid watches cmd"; for x in $(find /proc/*/fd/* -type l -lname 'anon_inode:inotify' 2>/dev/null); do PID=$(echo $x | cut -f 3 -d'/'); FD=$(echo $x | cut -f 5 -d'/'); WATCHCOUNT=$(grep -c inotify /proc/$PID/fdinfo/$FD); CMD=$(cat /proc/$PID/cmdline | sed 's/\x0/ /g'); echo "$PID $WATCHCOUNT $CMD"; done | sort -k 2 -n -r
which prints a list of commands with inotify watches sorted by number
of watches in decreasing order. On my system, flow and storybook use
up about 11000 watches. (See this StackExchange
answer for an explanation
for the above one-liner; however, its command is slower due to using
lsof.)
See this link for how to increase the watch limit; I set mine to 65536.