How Memcached Manages Memory: Slab Allocation, Eviction, and High‑Availability Design

This article explains Memcached's slab allocator memory management, key concepts like items, chunks, and pages, illustrates allocation and eviction processes, and discusses high‑availability architectures such as master‑slave and L1 caching layers for scalable distributed systems.

MemcachedSlab Allocation

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How Memcached Manages Memory: Slab Allocation, Eviction, and High‑Availability Design

Qunar Tech Salon

Jun 20, 2015 · Backend Development

Understanding Memcached Slab Allocation and LRU Behavior

This article explains how to start Memcached with specific parameters, describes the resulting slab class configuration, illustrates memory allocation with pages, chunks, and slabs, and discusses item placement, waste, and the per‑slab LRU eviction policy in detail.

LRUMemcachedSlab Allocation

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Understanding Memcached Slab Allocation and LRU Behavior