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For an intelligent IDE it is essential to be in the know about any external changes in files it working with - e.g. changes made by VCS, or build tools, or code generators etc. For that reason, IntelliJ platform spins background process to monitor such changes. The method it uses is platform-specific; and on Linux it is Inotify facility.

Inotify requires a "watch handle" to be set for each directory in the project. Unfortunately, the default limit of watch handles may not be enough for reasonably sized projects, and reaching the limit will force IntelliJ platform to fall back to recursive scans of directory trees.

To prevent this situation it is recommended to increase the watches limit (to, say, 512K). You can do it by adding following line to the /etc/sysctl.conf file:

Then run this command to apply the change:

And don't forget to restart your IDE.

Note: the watches limit is per-account setting. If there are other programs running under the same account which also uses Inotify the limit should be raised high enough to suite needs of all of them.

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