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From Stefano Mazzocchi <stef...@apache.org>
Subject Re: [RT] Adaptive Caching
Date Mon, 21 Jul 2003 22:42:58 GMT

On Friday, Jul 18, 2003, at 08:16 America/Guayaquil, Andreas Hochsteger 
wrote:

> Stefano Mazzocchi wrote:
>> Exactly! I came to that same exact conclusion from this very point: I
>> tried to come up with an optimal way to know which object to throw 
>> aaway
>> when the cache is full, and I found out that we were heuristically
>> trying to estimate which one was saving more resources... but without
>> even trying to measure it and thinking that time is the only valuable
>> resource.
>
> Throwing away a resource should be determined by the same cost function
> and not only by 'time' as the following example shows:
>
> There is a resource R1 in the cache, which consumes a quite high 
> ammount
> of cache memory and many other resource R2..Rx with low cache memory
> consumption, where each takes slightly less production time then R1.
>
> If you only take time as the measurement, then you have to purge some 
> of
> R2..Rx, since their cache efficiency is little less than R1.
>
> If you look at the global cache efficiency, you're likely see that
> removing just R1 might be a better solution, since you can use the free
> space to cache much more other resources.
>
> I don't know, if your RT suggests such a behaviour (although I've read
> it completely, but I forget fast these days ;-), I wanted to express it
> in my own less academic (an perhaps less accourate) words.

Thanks. You are right on target.

--
Stefano, happy to see the academic language barrier diminishing and the 
info coming across :-)


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