Re: ACL List Problems

From: Arjan de Vet <>
Date: Wed, 16 Oct 1996 21:07:29 +0200 (MET DST)

In article <> you write:

>I'm testing it right now with a list of 30,000 URLs. I don't get the
>same results--most of my requests are getting through.
>But the Squid process is taking 95% of the cpu.
>Seems like even a list of 4,000 is too many to put in the main Squid
>process. Would probably make more sense to put them in the redirector
>process, no? Then you might even do some fancy hashing, etc. to speed
>it up.

The simple speedup patch I made only works for ACLs where you have to
check that an entry *is* present in the list (e.g., whether an IP address
has access to the cache). It uses the fact that most requests from one
IP-address come in bursts and it implements Last Recently Used sorting of
the linked list.

When you have ACLs where you have to check that an entry *is not* present
(e.g., blocking certain sites on the Internet) my speedup patch absolutely
does not work because it still has to check the whole linked list :-(.

I've been playing with balanced binary trees recently and I'll see
if I can add this in the near future to Squid's ACL code (unless somebody
already started implementing something like this of course).

Received on Wed Oct 16 1996 - 12:36:02 MDT

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