The International Conference for High Performance Computing, Networking, Storage, and Analysis
The International Conference for High Performance Computing, Networking, Storage, and Analysis
Workshop: 14th International Workshop on Runtime and Operating Systems for Supercomputers (ROSS 2025)
Authors: Shaochang Liu and Jie Ren (College of William & Mary)
Abstract: Page reclamation is critical for system performance. However, understanding and quantifying inner workings of reclamation policies remains challenging. In this work, we present a comprehensive analysis of Linux's Two-Queue LRU (2QLRU) and Multi-Generational LRU (MGLRU) policies using a lightweight profiler that measures decision overhead and reclamation effectiveness. Across seven diverse applications under various memory constraints, we quantify how MGLRU achieves better reclamation decisions despite its higher decision making cost, while its performance benefits diminish under severe memory constraint. These insights provide guidance for future memory management optimizations.
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