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From "Gerhard Froehlich" <g-froehl...@gmx.de>
Subject RE: Adaptive Caching [was Re: initial checkin of the Scheme code]
Date Fri, 14 Dec 2001 17:44:53 GMT
>From: Stefano Mazzocchi [mailto:stefano@apache.org]
>

<skip/>

>
>Everytime a request comes, I have the information on the 'estimated'
>time the resource will need to be generated on the different routes.
>Once the decision is taken, I have the information on how much it took
>to get it and I can compare it with the "assumed" time that would have
>taken on the other path. Then I know how much time I *saved* with this
>choice.
>
>But we don't stop here: we also have a way to measure the efficiency of
>the cache itself between cache hits and cache misses.
>
>This information might be used to estimate the RAM a server would
>require to obtain near-maximum efficiency.
>
>And all this without even touching a single configuration!!!
>
>A wonderful example of the advancement of adaptivity on caching is that
>you have an immediate feedback (with numbers!!!) on how much a change,
>say, in your database monitoring code, influences caching efficiency.
>
>This is a completely innovative approach because the decision whether or
>not to cache something is estimated a-priori by system administrators,
>but in complex systems, very few people can make this decision and tune
>it for every change in the system.
>
>Consider this as a hotspot caching machine.

Berin, you introduced some days ago a Profiler in Avalon Excalibur. Is that
Component designed to handle such things?

  Gerhard (still trying to get the big picture of caching)

-------------------------------------------
Beer is God's way of showing us he loves us 
and wants us to be happy...
-------------------------------------------









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