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RACE: A Robust Adaptive Caching Strategy for Buffer Cache

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2 Author(s)
Yifeng Zhu ; Huazhong Univ. of Sci. & Technol., Wuhan ; Hong Jiang

Although many block replacement algorithms for buffer caches have been proposed to address the well-known drawbacks of the LRU algorithm, they are not robust and cannot maintain a consistent performance improvement over all workloads. This paper proposes a novel and simple replacement scheme, called the Robust Adaptive buffer Cache management schemE (RACE), which differentiates the locality of I/O streams by actively detecting access patterns that are inherently exhibited in two correlated spaces, that is, the discrete block space of program contexts from which I/O requests are issued and the continuous block space within files to which I/O requests are addressed. This scheme combines the global I/O regularities of an application and the local I/O regularities of individual files that are accessed in that application to accurately estimate the locality strength, which is crucial in deciding which blocks are to be replaced upon a cache miss. Through comprehensive simulations on 10 real-application traces, RACE is shown to have higher hit ratios than LRU and all other state-of-the-art cache management schemes studied in this paper.

Published in:

Computers, IEEE Transactions on  (Volume:57 ,  Issue: 1 )

Date of Publication:

Jan. 2008

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