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首页> 外文期刊>ACM Transactions on Design Automation of Electronic Systems >Lazy-RTGC: A Real-Time Lazy Garbage Collection Mechanism with Jointly Optimizing Average and Worst Performance for NAND Flash Memory Storage Systems
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Lazy-RTGC: A Real-Time Lazy Garbage Collection Mechanism with Jointly Optimizing Average and Worst Performance for NAND Flash Memory Storage Systems

机译：Lazy-RTGC：一种实时惰性垃圾收集机制，可以共同优化NAND闪存存储系统的平均性能和最差性能

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摘要

Due to many attractive and unique properties, NAND flash memory has been widely adopted in mission-critical hard real-time systems and some soft real-time systems. However, the nondeterministic garbage collection operation in NAND flash memory makes it difficult to predict the system response time of each data request. This article presents Lazy-RTGC, a real-time lazy garbage collection mechanism for NAND flash memory storage systems. Lazy-RTGC adopts two design optimization techniques: on-demand page-level address mappings, and partial garbage collection. On-demand page-level address mappings can achieve high performance of address translation and can effectively manage the flash space with the minimum RAM cost. On the other hand, partial garbage collection can provide the guaranteed system response time. By adopting these techniques, Lazy-RTGC jointly optimizes both the average and the worst system response time, and provides a lower bound of reclaimed free space. Lazy-RTGC is implemented in FlashSim and compared with representative real-time NAND flash memory management schemes. Experimental results show that our technique can significantly improve both the average and worst system performance with very low extra flash-space requirements.
机译：由于具有许多吸引人的独特特性，NAND闪存已在任务关键型硬实时系统和某些软实时系统中被广泛采用。但是，NAND闪存中的不确定性垃圾回收操作使得很难预测每个数据请求的系统响应时间。本文介绍了Lazy-RTGC，这是用于NAND闪存存储系统的实时惰性垃圾回收机制。 Lazy-RTGC采用两种设计优化技术：按需页面级地址映射和部分垃圾回收。按需页面级地址映射可以实现高性能的地址转换，并可以以最小的RAM成本有效地管理闪存空间。另一方面，部分垃圾回收可以提供有保证的系统响应时间。通过采用这些技术，Lazy-RTGC共同优化了平均响应时间和最差系统响应时间，并提供了较低的回收可用空间。 Lazy-RTGC在FlashSim中实现，并与代表性的实时NAND闪存管理方案进行了比较。实验结果表明，我们的技术可以以非常低的额外闪存空间要求显着提高平均和最差的系统性能。

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