Lock a directory / directories in memory.
$ mlockdir
Enumerating files in 1 folder(s) ... 30.98µs
Allocating empty memory map with 24 KiB ... 6.77µs
Mapping 4 files with 24 KiB in memory ... 48.92µs
Locking 4 files with 24 KiB in memory ... 25.97µs
Files locked ... Press any key to terminate.
Releasing memory ... 25.08µs
If no argument is given, then the current working directory is locked. Otherwise you can specify multiple directories as arguments.