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USENIX Technical Program - Abstract - Internet Technologies & Systems 99

Secondary Storage Management for Web Proxies

Evangelos P. Markatos, Manolis G.H. Katevenis, Dionisis Pnevmatikatos, and Michail Flouris, Institute of Computer Science (ICS) - FORTH


World-Wide Web proxies are being increasingly used to provide Internet access to users behind a firewall and to reduce wide-area network traffic. Recent results suggest that disk I/O is increasingly becoming the limiting factor for the performance of web proxies. In this paper we study the overheads associated with disk I/O for web proxies, and propose secondary storage management alternatives that improve performance. We use a combination of experimental evaluation and simulation based on traces from busy web proxies. We show that web proxies experience significant overheads due to disk I/O. We propose several file management methods that reduce the disk I/O overhead overhead by a factor of 25 overall, resulting in a single-disk service rate that exceeds 500 (URL-get) operations per second.
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Last changed: 25 Feb 2002 ml
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