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inofity is no fantastic. Memory use scales with the number of directories watched. The program that uses the inotify system call has to keep a mapping of file descriptors to paths. Inotify is slow, inefficient and error-prone for recursively watching file systems.

fanotify is not an alternative because it cannot monitor file deletion or renames and it requires root permission.

http://www.lanedo.com/filesystem-monitoring-linux-kernel/




> The program that uses the inotify system call has to keep a mapping of file descriptors to paths

If it doesn't care what file is modified and just wants to run a command on any change, why would it need to do this?


In that case it's not needed. One could imagine that one would like to start a specific command. That is what 'tup monitor' does.

Another use-case is a desktop search tool.

http://gittup.org/tup/manual.html




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