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http://dx.doi.org/10.9708/jksci.2020.25.02.001

2WPR: Disk Buffer Replacement Algorithm Based on the Probability of Reference to Reduce the Number of Writes in Flash Memory  

Lee, Won Ho (Dept. of Computer Engineering, Yeungnam University)
Kwak, Jong Wook (Dept. of Computer Engineering, Yeungnam University)
Publication Information
Journal of the Korea Society of Computer and Information / v.25, no.2, 2020 , pp. 1-10 More about this Journal
Abstract
In this paper, we propose an efficient disk buffer replacement policy which improves hit ratio and reduces writing operations of flash based storages. The flash based storage has many advantages, including a small form factor, non-volatility and high reliability, but there are problems caused by own limitations, like not-in-place update, short life cycle and asymmetric I/O latencies. To redeem these problems, this paper proposes the write weighted probability of reference(2WPR) policy. 2WPR policy predicts re-referencing probability and calculates localities of each page. Furthermore, by weighting write operations to every pages, 2WPR can reduce write operations to flash based storage. In addition, we can improve the performance with higher hit ratio and reduce the number of write operations and consequently shorten the latencies of each operation. The results show that our policy provides improvements of up to 10% for the hit ratio with the reduction of up to 5% for the flash writing operation compared with other policies.
Keywords
Buffer replacement policy; Flash based storage; Localities of pages; Weighted write; Probability of reference;
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