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arXiv · 2606.06145

Workload-Aware Autotuning of Block Size in Square-Root Decomposition

Ruize Zhao
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Abstract

The textbook choice B=sqrt(n) for square-root decomposition is asymptotically natural, but it is not always the fastest implementation choice. We study block-size autotuning as a reproducible algorithm-engineering problem. On 3,840 generated workloads with repeated grouped cross-validation, the selected KNN-9 policy reduces mean regret from 1.2769 to 1.0478 and yields a paired geometric-mean speedup of 1.158x over fixed sqrt(n) blocking. A separate Docker/Linux confirmation over 960 workloads gives the same direction of effect (1.112x). We retain two trace-derived checks: the six-window Baleen study improves by 1.104x, whereas the three-workload Wikidata smoke study is slower than fixed blocking. These contrasting results delimit the contribution: workload-aware selection can improve an already chosen block-decomposition implementation, but it is neither a universal replacement for fixed blocking nor a replacement for BIT.

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Ruize Zhao. 2026-07-28. Workload-Aware Autotuning of Block Size in Square-Root Decomposition. https://arxiv.org/abs/2606.06145

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