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arXiv · 2508.16023

PIPQ: Strict Insert-Optimized Concurrent Priority Queue

Olivia Grimes·Ahmed Hassan·Panagiota Fatourou·Roberto Palmieri
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Abstract

This paper presents PIPQ, a strict and linearizable concurrent priority queue whose design differs from existing solutions in literature because it focuses on enabling parallelism of insert operations as opposed to accelerating delete-min operations, as traditionally done. In a nutshell, PIPQ's structure includes two levels: the worker level and the leader level. The worker level provides per-thread data structures enabling fast and parallel insertions. The leader level contains the highest priority elements in the priority queue and can thus serve delete-min operations. Our evaluation, which includes an exploration of different data access patterns, operation mixes, runtime settings, and an integration into a graph-based application, shows that PIPQ outperforms competitors in a variety of cases, especially with insert-dominant workloads.

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Olivia Grimes, Ahmed Hassan, Panagiota Fatourou, Roberto Palmieri. 2025-08-22. PIPQ: Strict Insert-Optimized Concurrent Priority Queue. https://arxiv.org/abs/2508.16023

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