RE: Degrading Hit Ratios

From: Larmour, Jonathan <>
Date: Tue, 14 Oct 1997 14:43:25 +0100

Hash: SHA1

You have to add the _number_ of hits, not the _percentage_, I think.

Jonathan L.
Origin, 323 Cambridge Science Park,Cambridge,UK. Tel:+44 (1223)
 ---[ It is impossible to enjoy idling thoroughly unless one has ]---
 ------------[ plenty of work to do - Jerome K. Jerome ]-------------
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- ----------
From: fatman
Sent: 14 October 1997 14:26
To: Larmour, Jonathan
Cc: ''
Subject: RE: Degrading Hit Ratios

On Tue, 14 Oct 1997, Larmour, Jonathan wrote:

> Are (some of) your users going to the parent directly? If so, then
> the hits will be less on the small cache as it is being
   already checked that, no user know of the second cache, and they
been denied in the ACL.

> Of course, are you looking at the _total_ hits? Now you've split
> things into two, the parent cache will get less hits as most of the

> hits will be satisfied by the child cache. To find out the overall
> hit ratio, you have to add the hits of the child cache to the hits
> the parent cache, and divide this by the number of requests of the
> child cache (unless there are other caches in the hierarchy).
   thats actualy diffrent from what i have, the parent has a 25% hit
rate, while the smaller one has only 15%... but mabey just my maths
bad, is that a total 40% hit rate, or only 20% ?

> I imagine you are doing this to save memory. Certainly I've already

> been stung by the multiple IE4 downloads from different sites!
   Ahh, we were luckaly saved from this, one user d/l'ed ie, when
quickly threw it on our ftp site.

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Received on Tue Oct 14 1997 - 06:46:50 MDT

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