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Jun 14, 2021 · Backend Development

How Redis Evolved from Single‑Threaded to Multi‑Threaded: VM, BIO, and IO Thread Deep Dive

This article traces Redis’s transition from its original single‑threaded design to a multi‑threaded architecture by examining the historical VM thread, the BIO background‑job threads introduced in Redis 2.4 and 4.0, and the network IO threads added in Redis 6.0, complete with source‑code excerpts and detailed explanations of each component’s purpose and implementation.