PACE

Past cache modeling techniques are typically limited to a cache system with a fixed cache line/block size. This limitation is not a problem for a hardware cache where the cache line size is uniform. However, modern in-memory software caches, such as Memcached and Redis, are able to cache varied-size data objects. A software cache supports update and delete operations in addition to only reads and writes for a hardware cache. Moreover, existing cache models often assume that the penalty for each cache miss is identical, which is not true especially for software cache targeting web services, and past cache management policies that aim to improve cache hit rate are no longer sufficient.