Web-conscious storage management for web proxies

  • Authors:
  • Evangelos P. Markatos;Dionisios N. Pnevmatikatos;Michail D. Flouris;Manolis G. H. Katevenis

  • Affiliations:
  • Institute for Computer Science (ICS), Crete, Greece;IEEE and Institute for Computer Science (ICS), Crete, Greece;Institute for Computer Science (ICS), Crete, Greece;IEEE and Institute of Computer Science (ICS), Crete, Greece

  • Venue:
  • IEEE/ACM Transactions on Networking (TON)
  • Year:
  • 2002

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Abstract

Many proxy servers are limited by their file I/O needs. Even when a proxy is configured with sufficient I/O hardware, the file system software often fails to provide the available bandwidth to the proxy processes. Although specialized file systems may offer a significant improvement and overcome these limitations, we believe that user-level disk management on top of industry-standard file systems can offer similar performance advantages. In this paper, we study the overheads associated with file I/O in web proxies, we investigate their underlying causes, and we propose Web-Conscious Storage Management, a set of techniques that exploit the unique reference characteristics of web-page accesses in order to allow web proxies to overcome file I/O limitations. Using realistic trace-driven simulations, we show that these techniques can improve the proxy's secondary storage I/O throughput by a factor of 15 over traditional open-source proxies, enabling a single disk to serve over 400 (URL-get) operations per second. We demonstrate our approach by implementing Foxy, a web proxy which incorporates our techniques. Experimental evaluation suggests that Foxy outperforms traditional proxies, such as SQUID, by more than a factor of four in throughput, without sacrificing response latency.