Fragmentation Degree Research Based on File’s Layout

Abstract

Numerous resource allocating and releasing will cause fragmentation which will seriously affect the I/O performance of file systems. One method to solve this problem is file defragmentation. This paper focuses on fragmentation detection, the key part of the file defragmentation. We estimate file fragmentation situation through file’s layout, and then analyze the detailed effects of the situation on performance measurement. Then we quantize this by the file’s “fragmentation degree” through theoretical and experimental analyses. Finally we use it to estimate the file’s fragmentation and decide whether the file needs to be defragmented.

Comprehensive Value Discovery of Land Consolidation Projects: An Empirical Analysis of Shanghai, China

“…(4) Changes in the degree of landscape fragmentation The degree of landscape fragmentation (FS) primarily refers to the degree of fragmentation of the landscape, which reflects the complexity of the spatial structure of the landscape and to some extent reflects the degree of human disturbance to the landscape [71,[76][77][78][79]. The FS in Langxia Town decreased from 0.7763 to 0.7550, indicating that, after land consolidation, Langxia Town not only reduced idle construction land but also that the layout of rural settlement became more concentrated.…”