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Journal of Software:2017.28(8):1968-1981

一种基于小数据同步写的回写I/O调度器
刘星,江松,王洋,范小朋,须成忠
(中国科学院 深圳先进技术研究院, 广东 深圳 518055;中国科学院大学 深圳先进技术学院, 广东 深圳 518055;中国科学院 深圳先进技术研究院, 广东 深圳 518055;Department of Computer Science and Engineering, The University of Texas at Arlington, Arlington, TX 76010, USA;中国科学院 深圳先进技术研究院, 广东 深圳 518055;Department of Electrical and Computer Engineering, Wayne State University, Detroit, MI 48202, USA)
Writeback I/O Scheduler Based on Small Synchronous Writes
LIU Xing,JIANG Song,WANG Yang,FAN Xiao-Peng,XU Cheng-Zhong
(Shenzhen Institutes of Advanced Technology, The Chinese Academy of Sciences, Shenzhen 518055, China;Shenzhen College of Advanced Technology, University of Chinese Academy of Sciences, Shenzhen 518055, China;Shenzhen Institutes of Advanced Technology, The Chinese Academy of Sciences, Shenzhen 518055, China;Department of Computer Science and Engineering, The University of Texas at Arlington, Arlington, TX 76010, USA;Shenzhen Institutes of Advanced Technology, The Chinese Academy of Sciences, Shenzhen 518055, China;Department of Electrical and Computer Engineering, Wayne State University, Detroit, MI 48202, USA)
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Received:August 07, 2016    Revised:September 21, 2016
> 中文摘要: 小数据同步写普遍存在于各种计算机环境中,并且可以由计算机系统的不同层次软件产生,从底层操作系统一直到上层应用软件都可以生成小数据同步写请求.然而,操作系统的文件系统是以块作为最小逻辑可寻址单位,小数据写将会导致严重的写放大问题,使得系统的I/O性能大幅度降低.为了解决上述问题,提出了一种I/O调度器,并将其命名为Hitchhike.该调度器可以识别小数据写,并通过对其他数据块中的数据进行压缩,将小数据嵌入到压缩出来的空间中,从而将小数据和该数据块一起写入到磁盘上,以异步回写的方式完成小数据的同步写,不仅有效缓解了磁盘的写放大问题,也极大地提高了小数据同步写的效率.基于Linux 2.6.32的Deadline调度器实现了Hitchhike原型系统,并利用Filebench基准测试来测试调度器在吞吐量、I/O延迟等方面的性能.通过与传统I/O调度器的性能进行比较,可以发现,Hitchhike调度器能够显著地提高小数据同步写的性能高达48.6%.
中文关键词: 同步写  小数据写  I/O调度器  写放大
Abstract:Small and synchronous writes are pervasive in various environments and manifest in various levels of software stack, ranging from device drivers to application software. Given a block interface, small write can cause serious write amplifications, which can substantially degrade the overall I/O performance. To address this issue, this paper presents a block I/O scheduler, named Hitchhike. Hitchhike is able to identify small writes, and embed them into other data blocks through data compression. With Hitchhike, a writeback buffer for small synchronous writes can be enabled, not only removing the write amplification, but also dramatically improving the performance of small synchronous writes. Hitchhike is implemented based on the Deadline I/O schedulers in Linux 2.6.32, and evaluated by running Filebench benchmark. Testing results show that compared to traditional approaches, Hitchhike can significantly improve the performance of synchronous small writes up to 48.6%.
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基金项目:国家重点基础研究计划(973)(2015CB352400);国家自然科学基金(61572487,61672513,61572377,U1401258,6155 0110250);广东省自然科学基金(2015B010129011,2016A030313183);深圳市海外高层次人才创新创业专项(孔雀计划)(KQCX201 40521115045446);深圳市技术攻关项目(JSGG20150512145714248,JSGG20160229200957727) 国家重点基础研究计划(973)(2015CB352400);国家自然科学基金(61572487,61672513,61572377,U1401258,6155 0110250);广东省自然科学基金(2015B010129011,2016A030313183);深圳市海外高层次人才创新创业专项(孔雀计划)(KQCX201 40521115045446);深圳市技术攻关项目(JSGG20150512145714248,JSGG20160229200957727)
Foundation items:National Basic Research Program of China (973) (2015CB352400); National Natural Science Foundation of China (61572487, 61672513, 61572377, U1401258, 61550110250); Science and Technology Planning Project of Guangdong Province (2015B01 0129011, 2016A030313183); Shenzhen Overseas High-Caliber Personnel Innovation Funds (KQCX20140521115045446),Research Program of Shenzhen (JSGG20150512145714248, JSGG20160229200957727)
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刘星,江松,王洋,范小朋,须成忠.一种基于小数据同步写的回写I/O调度器.软件学报,2017,28(8):1968-1981

LIU Xing,JIANG Song,WANG Yang,FAN Xiao-Peng,XU Cheng-Zhong.Writeback I/O Scheduler Based on Small Synchronous Writes.Journal of Software,2017,28(8):1968-1981