基于文件布局的文件碎化检测与评估研究

摘要

The paper analyses the file fragmentation problem of a file system caused by its long use and the file fragmentation' s serious influence on the performance of the file system, and then focuses on file fragmentation detection and estimation, and proposes a novel fragmentation measurement model; file fragmentation grade model. This model can accurately estimate the file fragmentation situation through file layout, and simulate the detailed effects of fragmentation on I/O performance such as sequential reading, which provides a novel practical policy for the detection of file fragmentation.%针对文件系统由于长期使用导致文件碎化,严重影响文件系统性能问题进行了文件碎化的检测与评估研究,提出并验证了一种新颖的碎化评估模型——碎化因子模型.该模型能根据文件的磁盘几何布局判断文件碎化情况,同时能较为精确地模拟出这种碎化情况对文件性能如顺序读的具体影响,为评估文件碎化的状况及其对文件性能的影响提供了一种更为新颖实用的策略.