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Implications of proxy caching for provisioning networks and servers

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Title Implications of proxy caching for provisioning networks and servers
 
Creator RAUNAK, MOHAMMAD S
SHENOY, PRASHANT
GOYAL, PAWAN
RAMAMRITHAM, KRITHI
 
Subject bandwidth
internet
world wide web
telecommunication traffic
 
Description In this paper, we examine the potential benefits of web proxy caches in improving the effective capacity of servers and networks. Since networks and servers are typically provisioned based on a high percentile of the load, we focus on the effects of proxy caching on the tail of the load distribution. We find that, unlike their substantial impact on the average load, proxies have a diminished impact on the tail of the load distribution. The exact reduction in the tail and the corresponding capacity savings depend on the percentile of the load distribution chosen for provisioning networks and servers—the higher the percentile, the smaller the savings. In particular, compared to over a 50% reduction in the average load, the savings in network and server capacity is only 20-35% for the 99th percentile of the load distribution. We also find that while proxies can be somewhat useful in smoothing out some of the burstiness in web workloads; the resulting workload continues, however, to exhibit substantial burstiness and a heavy-tailed nature. We identify large objects with poor locality to be the limiting factor that diminishes the impact of proxies on the tail of load distribution. We conclude that, while proxies are immensely useful to users due to the reduction in the average response time, they are less effective in improving the capacities of networks and servers.
 
Publisher Association for Computing Machinery
 
Date 2009-07-03T04:44:33Z
2011-11-28T08:41:16Z
2011-12-15T09:57:45Z
2009-07-03T04:44:33Z
2011-11-28T08:41:16Z
2011-12-15T09:57:45Z
2000
 
Identifier Proceedings of the ACM SIGMETRICS International Conference on Measurement and Modeling of Computer Systems, Santa Clara, California, USA, 17-21 June 2000, 66-77
1-58113-194-1
10.1145/339331.339357
http://hdl.handle.net/10054/1586
http://dspace.library.iitb.ac.in/xmlui/handle/10054/1586
 
Language en