Don't know how well it would scale for a large number of files, but just to throw in another idea: maybe you could try inotify (or the respective Perl module Linux::Inotify2).  In case it doesn't turn out to become a resource hog... it might give much more detailed access statistics than a nightly scan of atimes would provide.

In reply to Re: tracking module usage by almut
in thread tracking module usage by pileofrogs

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