http://dx.doi.org/10.1109/TC.2013.52">
 

Document Type

Journal Article

Department/Unit

Department of Computer Science

Title

FD-Buffer: A cost-based adaptive buffer replacement algorithm for FlashMemory devices

Language

English

Abstract

© 2013 IEEE. In this paper, we present a design and implementation of FD-Buffer, a cost-based adaptive buffer manager for flash memory devices. Due to flash memory's unique hardware features, it has an inherent read-write asymmetry: writes involve expensive erase operations, which usually makes them much slower than reads. To address this read-write asymmetry, we revisit buffer management and consider the average I/O cost per page access as the main cost metric, as opposed to the traditional miss rate. While there have been a number of buffer management algorithms that take the read-write asymmetry into consideration, most algorithms fail to effectively adapt to the runtime workload or different degrees of asymmetry. In this paper, we develop a new replacement algorithm in which we separate clean and dirty pages into two pools. The size ratio of the two pools is automatically adapted based on the read-write asymmetry and the runtime workload. We evaluate the FD-Buffer with trace-driven experiments on real flash memory devices. Our trace-driven evaluation results show that our algorithm achieves 4.0-33.4 percent improvement of I/O performance on flash memory, compared to state-of-the-art flash-aware replacement policies.

Keywords

Buffer management, Flash memory, Read-write asymmetry, Solid-state drives

Publication Date

2014

Source Publication Title

IEEE Transactions on Computers

Volume

63

Issue

9

Start Page

2288

End Page

2301

Publisher

Institute of Electrical and Electronics Engineers

ISSN (print)

00189340

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