Re: [squid-users] What load can SQUID cope with in accelerator mode?

From: Joe Cooper <>
Date: Wed, 14 Mar 2001 12:36:24 -0600

In my tests, hardware like yours will max out at about 400-500 reqs/sec,
most likely, for accelerating a site that will mostly fit in RAM (the
popular stuff anyway--rarely accessed objects can pull from disk). The
second CPU in your systems is almost useless for Squid at this time
(unless you run two squids and use policy routing to roughly evenly
divide your traffic between them).

Of course the redirectors may or may not effect this...some are faster
than others, and it also depends on how many rules are being checked on
your redirectors. Obviously a large number of regex rules will slow
things down.

You should be aware, however, that Squid's CPU behavior isn't linearly
scalable. Up to some point it is, but eventually a poll loop begins to
show its flaws (one of which is the inability to scale to multiple
processors without using multiple processes).

Simon Morley wrote:

> Hi,
> I am trying to work out how much load I can expect to handle using SQUID in
> accelerator mode. It would very much help if people could give me an idea of
> what load they are coping with for a given hardware configuration and OS.
> For example we have the following hardware:-
> Dual PIII 800Mhz with 1GB RAM and 8GB SCSI for the cache.
> This is running Linux with a 2.2 kernel.
> SQUID is in accelerator mode and is running with a pool of 30 redirectors
> which munge URL's from public to internal representation. This all front
> end's a pool of Windows 2000 servers which runs our service.
> At peak load we are getting about 100 requests a second, of which I am
> getting a 95% hit rate with the average object size being around 6KB. This
> uses about 6 to 7% CPU and around 2 or 3 of the redirectors to be in
> permanent use.
> This does suggest that we will run out of bandwidth before SQUID runs out of
> power, but I want to get more *real world* values.
> Any help would be very much appreciated.
> Simon

                      Joe Cooper <>
                  Affordable Web Caching Proxy Appliances
Received on Wed Mar 14 2001 - 11:55:00 MST

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