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Re: Conventions for Sharing User Agent Profiles

From: Simon Spero <ses@tipper.oit.unc.edu>
Date: Tue, 13 Aug 1996 10:29:51 -0400 (EDT)
To: Koen Holtman <koen@win.tue.nl>
Cc: mogul@pa.dec.com, jg@zorch.w3.org, http-wg%cuckoo.hpl.hp.com@hplb.hpl.hp.com
Message-Id: <Pine.SUN.3.91.960813101018.19825A-100000@tipper.oit.unc.edu>
On Tue, 13 Aug 1996, Koen Holtman wrote:

> Simon Spero:

> I'm particularly interested in what you propose to include in the UA
> profile.  There is a tradeoff between covering a larger area of
> negotiation and getting more `profile cache misses' with your scheme,

With NG, there isn't quite a strong a division between the UA profile and 
the individual user's profile; profiles can be modified dynamically; 
the server has the option of either caching the whole modified profile, 
or just the 'base class' profile; the client just needs to know and note  
what profile has been cached. 

> where do you stop exactly?  How many `profile cache misses' do you
> estimate under your proposal?

The question of where you stop is up to the server; just caching the UA 
specific base profiles wins big; spending  the extra effort to cache 
per-user profiles is an even bigger win - the tradeoff depends on how 
much perisistent storage you wan tto dedicate to the problem. 

I would expect to see a big win with a cache size of around 20 (enough for
the most popular Nevergethere, Exploder, and Slosaic versions to be safe
from getting flushed by the small fry. There'd be a bigger win around 
2000, as even the small-fry get to stay put.

For a big site with a regular audience, it might be worth spending a 
hundred dollars or so on this and dedicating up to a gig or to profile 
caching; this keeps things really fast for caching.

Simon (more later)


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Received on Tuesday, 13 August 1996 07:33:31 EDT

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