内存文件系统综述

发布时间：2018-03-14 10:13

本文选题：文件系统　切入点：内存　出处：《计算机研究与发展》2015年S2期 　论文类型：期刊论文

【摘要】：随着处理器和存储器之间性能差距越来越大,特别是处理器和外存之间的巨大差距使得I/O瓶颈问题日益突出.利用内存来缓解I/O瓶颈的传统做法是在内存中设置磁盘文件cache(buffer cache),从而减少访问外存的次数.但数据爆炸式的增长对内存容量的需求越来越大,传统方法通过增加cache容量带来的效益反而会减少,而且在内外存之间频繁交换数据会产生较大的开销,因此在内存上直接建立内存文件系统的方法应运而生.此外,随着工业技术的进步,新型非易失性存储介质逐渐出现在人们的视野中,它可字节寻址和非易失的特性使得数据在内存级就可以持久化存储.由于文件系统总是和介质本身紧密相连的,分别讨论了基于易失性内存和非易失性内存的文件系统,阐述了它们各自的主要特点,如存储特性、访问方法、读写性能等方面,并通过比较发现内存文件系统在性能上比磁盘文件系统有巨大的提升,将是一种缓解I/O瓶颈更有效的途径.
[Abstract]:As the performance gap between processors and memory grows, In particular, the huge gap between processor and external memory makes the problem of I / O bottleneck more and more serious. The traditional method of using memory to ease I / O bottleneck is to set up disk file cache(buffer cache in memory so as to reduce the number of times of accessing external memory. According to the explosive growth, the demand for memory capacity is increasing. The traditional method can reduce the benefits by increasing the cache capacity, and the frequent exchange of data between internal and external memory will result in a large amount of overhead. Therefore, the method of building memory file system directly on the memory has emerged as the times require. With the development of industrial technology, new non-volatile storage media has gradually appeared in people's vision. It is byte addressable and nonvolatile so that data can be persisted at the memory level. Since file systems are always closely related to the medium itself, file systems based on volatile memory and non-volatile memory are discussed, respectively. Their main characteristics, such as storage characteristics, access methods, read and write performance, etc., are described. Through comparison, it is found that the performance of memory file system is greatly improved than that of disk file system. It would be a more effective way to ease the I / O bottleneck.
【作者单位】：高性能计算国家重点实验室(国防科学技术大学);国防科学技术大学计算机学院;
【基金】：国家“八六三”高技术研究发展计划基金项目(2015AA015305)
【分类号】：TP333.1

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