USENIX 2003 Annual Technical Conference, FREENIX Track Abstract
|Pp. 91-100 of the Proceedings|
In-Place Rsync: File Synchronization for Mobile and Wireless Devices
David Rasch and Randal Burns, Johns Hopkins University
The open-source rsync utility reduces the time and bandwidth required to update a file across a network. Rsync uses an interactive protocol that detects changes in a file and sends only the changed data [18,19]. We have modified rsync so that it operates on space constrained devices. Files on the target host are updated in the same storage the current version of the file occupies. Space-constrained devices cannot use traditional rsync because it requires memory or storage for both the old and new version of the file. Examples include synchronizing files on cellular phones and handheld PCs, which have small memories. The in-place rsync algorithm encodes the compressed representation of a file in a graph, which is then topologically sorted to achieve the in-place property. We compare the performance of in-place rsync to rsync and conclude that in-place rsync degrades performance minimally.
- View the full text of this paper in HTML and
Until June 2004, you will need your USENIX membership identification in order to access the full papers. The Proceedings are published as a collective work, © 2003 by the USENIX Association. All Rights Reserved. Rights to individual papers remain with the author or the author's employer. Permission is granted for the noncommercial reproduction of the complete work for educational or research purposes. USENIX acknowledges all trademarks within this paper.
- If you need the latest Adobe Acrobat Reader, you can download it from Adobe's site.