Variable QoS from shared Web caches User-centered design and value-sensitive replacement.pdf

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Variable QoS from shared Web caches User-centered design and value-sensitive replacement.pdf

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Variable QoS from shared Web caches User-centered design and value-sensitive replacement

Variable QoS from Shared Web Caches: User-Centered Design and Value-Sensitive Replacement Terence P. Kelly Sugih Jamin Jeffrey K. MacKie-Mason ftpkelly,jaming@ jmm@ Electrical Engineering Computer Science Economics School of Information University of Michigan Ann Arbor, Michigan 48109 USA November 12, 1999 Abstract Due to differences in server capacity, external bandwidth, and client demand, some Web servers value cache hits more than others. Assuming that a shared cache knows the extent to which different servers value hits, it may employ a value-sensitive replacement policy in order to generate higher aggregate value for servers. We consider both the prediction and value aspects of this problem and introduce a novel value-sensitive LFU/LRU hybrid that biases the allocation of cache space toward documents whose origin servers value caching most highly. We compare our al- gorithm with others from the Web caching literature and discuss from an economic standpoint the problems asso- ciated with obtaining servers’ private valuation informa- tion. 1 Introduction Since the inception of the World Wide Web, caching has helped to reduce server load, network traffic, and latency at the client end. However, among researchers no clear consensus exists on the relative importance of these goals or of related performance metrics such as hit rate and byte hit rate. Furthermore, Web caches currently provide only “best-effort” service, in the sense that they do not account MIT Workshop on Internet Service Quality Economics, Cambridge, Massachusetts, USA, 2–3 December 1999. Details available at /isqe/ Research funded by DARPA/ITO grant F30602-97-1-0228. Trace data courtesy NLANR (NSF grants NCR-9616602 and NCR-9521745). Jamin supported in part by NSF Career Award ANI-9734145, Presiden- tial Early Career Award for Scientists and Engineers (PECASE) 1998, and equipment support from Sun Microsystems Inc. and Compaq (Digi- tal Equipment) Corp. MacKie-Mason supported in part by an IB