W3C home > Mailing lists > Public > http-caching-historical@w3.org > February 1996

Re: Ordered 'opqque' validators

From: Luigi Rizzo <luigi@labinfo.iet.unipi.it>
Date: Tue, 6 Feb 1996 21:04:48 +0100 (MET)
Message-Id: <199602062004.VAA24460@labinfo.iet.unipi.it>
To: pjc@trusted.com (Peter J Churchyard)
Cc: fielding@avron.ICS.UCI.EDU, sjk@amazon.com, http-caching@pa.dec.com
> Is anybody planning to do any modelling of these protocols?
> As I understand it, millions of http clients and servers may be
> expected to implement a protocol thats designed to be used in a
> continental mega cache  - continental mega cache  situation. Wouldn't this
> rather special situation better be handled by a specific protocol for that
> environment?

you raise an interesting point.

Another thing I would really like to know, to what extent we can
expect hierarchical caching to be effective ?

We know that there are some very popular servers on the internet,
so that caching traffic to these servers might look effective. But
the objects are single files/documents. What percentage of the
millions of files of these servers gets really accessed let's say
10 or more times (within a reasonable time frame, say 1 week .. 1
month), so that caching really turns out to be a significant saving ?

And, especially, how many of these files get accessed just once,
so that no caching policy is going to help ? I suspect getting
these info from some very large server would really help in
determining what we could expect from our cache, the depth of the
hierarchy, etc.

Luigi Rizzo                     Dip. di Ingegneria dell'Informazione
email: luigi@iet.unipi.it       Universita' di Pisa
tel: +39-50-568533              via Diotisalvi 2, 56126 PISA (Italy)
fax: +39-50-568522              http://www.iet.unipi.it/~luigi/
Received on Tuesday, 6 February 1996 20:29:58 UTC

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