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Performance impact of large file transfer on web proxy caching: A case study in a high bandwidth campus network environment

Content Provider	IEEE Xplore Digital Library
Author	Kim, Hyun-Chul Lee, Dongman Chon, Kilnam Jang, Beakcheol Kwon, Taekyoung Choi, Yanghee
Copyright Year	2011
Abstract	Since large objects consume substantial resources, web proxy caching incurs a fundamental trade-off between performance (i.e., hit-ratio and latency) and overhead (i.e., resource usage), in terms of caching and relaying large objects to users. This paper investigates how and to what extent the current dedicated-server based web proxy caching scheme is affected by large file transfers in a high bandwidth campus network environment. We use a series of trace-based performance analyses and profiling of various resource components in our experimental squid proxy cache server. Large file transfers often overwhelm our cache server. This causes a bottleneck in a web network, by saturating the network bandwidth of the cache server. Due to the requests for large objects, response times required for delivery of concurrently requested small objects increase, by a factor as high as a few million, in the worst cases. We argue that this cache bandwidth bottleneck problem is due to the fundamental limitations of the current centralized web proxy caching model that scales poorly when there are a limited amount of dedicated resources. This is a serious threat to the viability of the current web proxy caching model, particularly in a high bandwidth access network, since it leads to sporadic disconnections of the downstream access network from the global web network. We propose a peer-to-peer cooperative web caching scheme to address the cache bandwidth bottleneck problem. We show that it performs the task of caching and delivery of large objects in an efficient and cost-effective manner, without generating significant overheads for participating peers.
Starting Page	52
Ending Page	66
Page Count	15
File Size	3624545
File Format	PDF
ISSN	12292370
Volume Number	12
Issue Number	1
Language	English
Publisher	Editorial Department of Journal of Communications and Networks
Publisher Date	2010-02-01
Publisher Place	South Korea
Access Restriction	Subscribed
Rights Holder	JCN
Subject Keyword	Bandwidth Servers Time factors Educational institutions Multimedia communication Internet Peer to peer computing workload characterization Peer-to-peer performance measurement web cache
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications Information Systems

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