標題: File Fragmentation in Mobile Devices: Measurement, Evaluation, and Treatment
作者: Ji, Cheng
Chang, Li-Pin
Hahn, Sangwook Shane
Lee, Sungjin
Pan, Riwei
Shi, Liang
Kim, Jihong
Xue, Chun Jason
資訊工程學系
Department of Computer Science
關鍵字: Measurements;flash memory;file fragmentation;I/O performance
公開日期: 1-Sep-2019
摘要: Mobile devices, such as smartphones, have become a necessity in our daily life. However, users may notice that after being used for a long time, mobile devices begin to exhibit a sluggish response. Based on an empirical study on a collection of aged smartphones, this work identified that file fragmentation is among the key factors that contribute to the progressive degradation of response time. This study takes a three-step approach: First, this study designed a set of reproducible file-system aging processes based on User-Interface (UI) script replay. Through the aging processes, it confirmed that file fragmentation quickly emerged, and SQLite files were among the most severely fragmented files. Second, based on the workloads of a selection of popular mobile applications, this study observed that file fragmentation did have an impact on user-perceived latencies. Specifically, the launching time of Chrome on an aged file system was 79 percent slower than it was on a pristine file system. Third, this study evaluated existing treatments of file fragmentation, including space preallocation, persistent journal, and file defragmentation to understand their efficacies and limitations. This study also evaluated a state-of-the-art copyless defragmenter, janusd, to show its advantage over the existing methods.
URI: http://dx.doi.org/10.1109/TMC.2018.2869737
http://hdl.handle.net/11536/152592
ISSN: 1536-1233
DOI: 10.1109/TMC.2018.2869737
期刊: IEEE TRANSACTIONS ON MOBILE COMPUTING
Volume: 18
Issue: 9
起始頁: 2062
結束頁: 2076
Appears in Collections:Articles