# TEST DATA

155GB, 14430 files in 2716 directories and subdirectories:
$ du -sh /var/lib/mpd/music
155G    /var/lib/mpd/music
$ find /var/lib/mpd/music -type d|wc -l
2716
$ find /var/lib/mpd/music -type f|wc -l
14430

# SCANNING

Initial scan takes 5 minutes, probably because of mime-type detection:
$ time ./atom
[...]
14430 files found, 14430 new or changed.

real    5m4.144s
user    0m19.821s
sys     0m17.393s

A second scan takes less than 14 seconds:
$ time ./atom
[...]
14430 files found, 0 new or changed.

real    0m13.770s
user    0m11.169s
sys     0m1.844s