当数据库遇到新的存储设备:通过配置理解和暴露性能不匹配

Haochen He, Erci Xu, Shanshan Li, Zhouyang Jia, Si Zheng, Yue Yu, Jun Ma, Xiangke Liao
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引用次数: 0

摘要

NVMe SSD极大地提高了I/O速度,具有高达GB/s的吞吐量和微秒级的延迟。不幸的是,DBMS用户经常会发现,与传统存储设备相比,他们的高性能存储设备往往提供的性能低于预期,甚至更差。虽然许多工作都集中在提出新的DBMS设计来充分利用NVMe ssd,但很少有系统地研究现有数据库上这种性能不匹配的症状、根本原因和可能的检测方法。在本文中,我们从一项实证研究开始,通过受控的配置调优,系统地揭示和分析了六个流行数据库上的性能不匹配。从研究中,我们发现所有六个数据库都存在性能不匹配的问题。此外,我们得出结论,根本原因可以归类为数据库在I/O大小、I/O并行性和I/O顺序性方面对新存储设备特征的不了解。我们向开发人员报告了17个不匹配项,其中15个已确认。此外,我们意识到测试所有配置旋钮的效率很低。因此,我们提出了一个快速的性能不匹配检测框架,评估表明我们的框架在不牺牲效率的情况下比基线提高了两个数量级的速度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
When Database Meets New Storage Devices: Understanding and Exposing Performance Mismatches via Configurations
NVMe SSD hugely boosts the I/O speed, with up to GB/s throughput and microsecond-level latency. Unfortunately, DBMS users can often find their high-performanced storage devices tend to deliver less-than-expected or even worse performance when compared to their traditional peers. While many works focus on proposing new DBMS designs to fully exploit NVMe SSDs, few systematically study the symptoms, root causes and possible detection methods of such performance mismatches on existing databases. In this paper, we start with an empirical study where we systematically expose and analyze the performance mismatches on six popular databases via controlled configuration tuning. From the study, we find that all six databases can suffer from performance mismatches. Moreover, we conclude that the root causes can be categorized as databases' unawareness of new storage devices characteristics in I/O size, I/O parallelism and I/O sequentiality. We report 17 mismatches to developers and 15 are confirmed. Additionally, we realize testing all configuration knobs yields low efficiency. Therefore, we propose a fast performance mismatch detection framework and evaluation shows that our framework brings two orders of magnitude speedup than baseline without sacrificing effectiveness.
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