Re: [squid-users] slow reconfigure on squid3

From: Mr J Potter <>
Date: Wed, 4 Jul 2012 08:49:23 +0100

Hi all,

thanks for your responses...

versions - I use the standard ones with Debian squeeze (2.7.stable9 and 3.1.6)

Yes there are lots of helpers - 25 NTLM helpers and 10 squiduguard
helpers, so this could account for slow reconfig.

Upgrading to 3.2 seems like a good bet - are there ready-rooled squid
3.2 debs available for Squeeze or do I have to make my own?

We currently run squid in 3 different flavours of authentication -
NTLM for PCs, ident for macs and digest for guest network, so have 3
distinct squid setups running on our proxy server. Would it be worth
setting these all up as non-caching, then set up a parent caching
server, or will setting them up as cache peers make them share their
caches at all?



On 2 July 2012 14:44, Marcus Kool <> wrote:
> Squid reconfigure can indeed take a long time. Especially when Squid
> uses lots of memory and starts helpers. Starting helpers takes a
> large amount of kernel resources when Squid is large, e.g. 2+ GB
> since it forks itself and replaces its copy by a new process. The
> fork can take a long time. If you use a URL rewritor you can
> easily have 24 or more of them and this makes 24 copies of a large
> process.
> How large is squid ?
> Can you post the output of
> ps -o pid,stime,sz,vsz,rss,args -C squid
> I wrote a test program to test the performance of forking X times
> a large process. I can post it if you are interested.
> Marcus
> On 07/02/2012 05:08 AM, Mr J Potter wrote:
>> Hi all,
>> Does anyone have any tips on how to fix this issue:
>> We've just moved to squid3 from squid2, and now when we do squid3 -k
>> reconfigure we get about 30 seconds of squid refusing/failing to
>> forward requests while it rejigs itself. I don't know if this is
>> squid3 rescanning the cache or doing something with squidguard (we
>> have a fairly complex+large squidguard setup)? I don't think this
>> happened with squid2.
>> What can we do to make this less noticeable?
>> - make it reconfigure faster?
>> - multiple squid servers - can we do failover somehow (either proxy
>> DNS record points to them both, or they automatically redirect (is
>> this what cache peers are for?))?
>> - go back to squid 2 - I didn't see any end user benefits of squid3
>> over squid2...
>> any help would be greatly appreciated.
>> thanks
>> Jim Potter
>> UK
Received on Wed Jul 04 2012 - 07:49:31 MDT

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