Impact of traffic distribution on web cache performance
by Manuel Gómez Zotano; Jorge Gómez-Sanz; Juan Pavón
International Journal of Web Engineering and Technology (IJWET), Vol. 10, No. 3, 2015

Abstract: Caches are a critical element of web-based information systems. Understanding the expected behaviour of cache policies is especially important for achieving good quality of service. Existing works have suggested that the behaviour of the web demand can be modelled as a Zipf distribution with α ≤ 1. New evidence, which is presented in this paper, shows that today websites are following Zipf distributions with α > 1. This article analyses real logs obtained from the client layer of high traffic websites. The main result of this article is that under these conditions, the cache hit ratio can be extremely high with a very small cache size. This means that a very expensive and high resource demanding cache is not needed for effective implementation: a cache size equal to 0.6% of the working set is enough to reach more than 80% of hit ratio, once the right replacement policy has been chosen.

Online publication date: Fri, 09-Oct-2015

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Web Engineering and Technology (IJWET):
Login with your Inderscience username and password:

Username:        Password:          Forgotten your password?

Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com