inotify를 이용한 SSD기반 사용자수준 프리페처

초록

Prefetching is a technique designed to enhance the slow response time of applications. The problem with the technique is the periodic I/O monitoring which decides the prefetching time hence causing monitoring overhead. Meanwhile, applying the previous HDD based prefetcher to high-performance SSD has limits. In this paper, we propose a new prefetcher reflecting the characteristic of SSD, low monitoring overhead, activated at a given time. We merge I/O request to improve I/O operation. Moreover, we reduce I/O bottlenecks by prefetching when the application has few I/O requests. Furthermore, we use an inotify system call to reduce monitoring overhead by eliminating periodic monitoring. We conduct as experiment on the four applications and our result depicted that, the prefetcher reduce an application’s launch time by up to 40% and loading time by up to 9%.

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