mocache implements the CLOCK-Pro caching algorithm. CLOCK-Pro is a patent-free alternative to the Adaptive Replacement Cache, https://en.wikipedia.org/wiki/Adaptive_replacement_cache. It is an approximation of LIRS ( https://en.wikipedia.org/wiki/LIRS_caching_algorithm ), much like the CLOCK page replacement algorithm is an approximation of LRU. This implementation is based on the python code from https://bitbucket.org/SamiLehtinen/pyclockpro . Slides describing the algorithm: https://fr.slideshare.net/huliang64/clockpro The original paper: https://static.usenix.org/event/usenix05/tech/general/full_papers/jiang/jiang_html/html.html It is MIT licensed, like the original.