When Every Bit Counts: How Valkey Rebuilt Its Hashtable for Modern Hardware

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Posted on Tue Apr 7 2026 | 7:10 pm

Madelyn Olson discusses the evolution of Valkey's data structures, moving away from "textbook" pointer-chasing HashMaps to more cache-aware designs. She explains the implementation of "Swedish" tables to maximize memory density. She shares insights on systems intuition, memory prefetching, and the rigorous testing needed for mission-critical caches.

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