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Summary: The Multicast Bandwidth Advantage in Serving
a Web Site
Yossi Azar 1 , Meir Feder 2 , Eyal Lubetzky 3 , Doron Rajwan 4 , and Nadav
Shulman 5
1 Dept. of Computer Science, Tel-Aviv University, Tel-Aviv, 69978, Israel.
azar@tau.ac.il
2 Bandwiz, Israel and Department of Electrical Engineering - Systems, Tel Aviv
University, Tel-Aviv, 69978, Israel. Meir@bandwiz.com
3 Bandwiz, Israel. EyalL@bandwiz.com
4 Bandwiz, Israel. Doron@bandwiz.com
5 Bandwiz, Israel. Nadav@bandwiz.com
Abstract. Delivering popular web pages to the clients results in high
bandwidth and high load on the web servers. A method to overcome this
problem is to send these pages, requested by many users, via multicast.
In this paper, we provide an analytic criterion to determine which pages
to multicast, and analyze the overall saving factor as compared with
a unicast delivery. The analysis is based on the well known observation
that page popularity follows a Zipf-like distribution. Interestingly, we can
obtain closed-form analytical expressions for the saving factor, that show
the multicast advantage as a function of the site hit-rate, the allowed
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