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Re: Ordered 'opqque' validators

From: Alex Lopez-Ortiz <alopez-o@barrow.uwaterloo.ca>
Date: Wed, 7 Feb 1996 11:18:55 -0500 (EST)
Message-Id: <199602071618.LAA17909@barrow.uwaterloo.ca>
To: Z.Wang@cs.ucl.ac.uk (Zheng Wang)
Cc: luigi@labinfo.iet.unipi.it, http-caching@pa.dec.com
> >There is a theorem in statistics which says that the the combination of
> >large numbers of random variables yields to a gaussian distribution,
> >independently of the distribution of each single variable. Similarly,
> >when we have a national or continental cache, I expect the number of users
> >to be so large to make differences disappear and make the aggregate
> >result almost the same everywhere.
>A number of studies suggested a cache hit rate of 30-50% and
>the results seem to be very consistent. See the paper
>by Marc Abrams et al "Caching Proxies: Limitations and
>Potentials" in proceedings of WWW4 for references.

I would suggest as well

J. Gwertzman, M. Seltzer. The Case for Geographical Push-Caching, 
in VINO: The 1994 Fall Harvest, Technical Report TR-34-94, Center 
for Research in Computing Technology, Harvard University, December, 1994.

A. Bestavros, Demand-based Document Dissemination for the World-Wide Web. 
Technical Report 95-003, Computer Science Department, Boston University. 
February, 1995.

A. Bestavros, R. L. Carter, M. E. Crovella, C. R. Cunha, A. Heddaya, 
S. A. Mirdad, Application-Level Document Caching in the Internet.
Technical Report BU-CS-95-002, Computer Science Deparment, Boston
University, Revised March, 1995.

All of which are available on the Web...

Here at Waterloo we have also modelled push-caching, and obtained 
a cache hit rate of ~35%, as percentage of traffic volume, as opposed
to total number of hits. (This paper was submitted to WWW5).



Alex Lopez-Ortiz                             alopez-o@neumann.UWaterloo.ca
http://daisy.uwaterloo.ca/~alopez-o                     FAX (519)-885-1208
Department of Computer Science                      University of Waterloo
Waterloo, Ontario N2L 3G1                                           Canada
Received on Wednesday, 7 February 1996 16:58:40 UTC

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