mmap is being used as a cheap way to sidestep I/O. That doesn't make as much sense in Perl. A more natural solution in Perl is to use a dbm like Berkeley DB. Going an alternate direction you can probably store your information in under 1 GB using vec to store a vector of 32-bit numbers, each of which uses 3 bits for the rating, and the rest for the user ID.
Personally I'd be inclined to use vec. (Actually I'd be inclined to use another language than Perl...)
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