分析flash 文件系統的損耗均衡問題，指出損耗均衡的觸發條件對系統I/O 性能的影響。在最新UBIFS 文件系統上運行測試程序，
結果證明在不同損耗均衡觸發條件下，系統I/O 性能的最大差距超過20%。針對現有損耗均衡算法的不足提出一種改進的自適應算法。
關鍵詞：損耗均衡；垃圾回收；系統I/O 性能；flash 文件系統
Impact of UBIFS Wear-leveling on System I/O Performance
HAN Chun-xiao, CHEN Xiang-lan, LI Xi, GONG Yu-chang
(Department of Computer Science and Technology, University of Science and Technology of China, Hefei 230027)
【Abstract】This paper analyzes the problem of file system wear-leveling, and points out that the wear-leveling trigger condition will impact system
I/O performance. Benchmark is performed on a latest flash file system——UBIFS, and the results show that system I/O performances vary by 20%
under different trigger threshold. Aiming at the shortcoming of existing wear-leveling algorithm, it proposes an improved self-adapting algorithm.
【Key words】wear-leveling; garbage-collection; system I/O performance; flash FS