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arXiv · 2508.18422

Improving Pinwheel Density Bounds for Small Minimums

Ahan Mishra·Parker Rho·Robert Kleinberg
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Abstract

The density bound for schedulability for general pinwheel instances is $\frac{5}{6}$, but density bounds better than $\frac{5}{6}$ can be shown for cases in which the minimum element $m$ of the instance is large. Several recent works have studied the question of the 'density gap' as a function of $m$, with best known lower and upper bounds of $O \left( \frac{1}{m} \right)$ and $O \left( \frac{1}{\sqrt{m}} \right)$. We prove a density bound of $0.84$ for $m = 4$, the first $m$ for which a bound strictly better than $\frac{5}{6} = 0.8\overline{3}$ can be proven. In doing so, we develop new techniques, particularly a fast heuristic-based pinwheel solver and an unfolding operation.

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Ahan Mishra, Parker Rho, Robert Kleinberg. 2025-08-25. Improving Pinwheel Density Bounds for Small Minimums. https://arxiv.org/abs/2508.18422

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