slab allocator (I - this article , II , III) is the core module of the cache system, which largely determines how efficient the bottleneck resource, memory, can be utilized. The other 3 parts, namely, LRU algorithm (I , II , III) for entry expiration; and an event driven model (I , II , III) based on libevent; and consistent hashing for data distribution, are built around it. Variants of slab allo