一种固态盘的读写性能优化调度方法

发布时间：2018-03-07 18:02

本文选题：闪存　切入点：固态盘　出处：《计算机科学》2017年06期 　论文类型：期刊论文

【摘要】：相比于传统机械硬盘,基于NAND Flash的固态盘由于具有非易失性、高性能、低功耗等优点,被广泛应用于数据中心、云计算、在线事务交易等场景。然而,由于NAND Flash中的读操作速度远远快于写操作速度,当读写请求并发执行时,读请求可能被写请求阻塞,从而表现出极大的读延时。在许多以读请求为主的场合,尤其是在线事物交易中(读请求占总请求的比例超过90%),读延时的急剧增加严重影响了系统的整体性能。提出一种读写性能优化调度的策略,通过在闪存转换层之下动态调整读写请求的优先序列,使读性能获得显著的提升。实验中,通过对固态盘仿真器的设计与实现,对读写调度策略的有效性进行了系统的评估。实验结果表明,在该调度策略下,系统中读延时的最大值和平均值均得到了显著的减少,且降幅分别达到了72%和41%。
[Abstract]:Compared with traditional mechanical hard disk, solid state disk based on NAND Flash is widely used in data center, cloud computing, online transaction and other scenarios because of its advantages of non-volatile, high performance and low power consumption. Because the read operation in NAND Flash is much faster than the write operation, when the read / write request is executed concurrently, the read request may be blocked by the write request, thus showing a great read delay. Especially in online transaction (the proportion of read request to total request is more than 90%), the sharp increase of read delay seriously affects the overall performance of the system. By dynamically adjusting the priority sequence of read and write requests under the flash memory conversion layer, the read performance is greatly improved. In the experiment, the solid-state disk simulator is designed and implemented. The effectiveness of the read-write scheduling policy is systematically evaluated. The experimental results show that the maximum and average read delay in the system are significantly reduced by 72% and 41 respectively.
【作者单位】：武汉光电国家实验室;信息存储系统教育部重点实验室;
【基金】：国家自然科学基金(61300047) 中央高校基本科研业务费(HUST:2016YXMS019)资助
【分类号】：TP333

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