Some developer tools I'm working with lately, like node watch, listen to changes in a filesystem folder using native system APIs for this. On unix systems I had some trouble with those, but good trouble, let me explain.
In unix systems there is a limit on the number of files being watched at a time b a process. And the kernel won't allow a process to watch too many files at the same time.
This is why, we can have trouble while executing development environments based in node watch (grunt watch, gulp watch, etc) in unix (linux and mac). The name of the error has the code : ENOSPC. It mostly fails or enters in a infinite loop, for example:
grunt watch Warning: watch ENOSPC
SolutionThe solution in linux is the following:
echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p