Re: 1.2.20beta async-io

From: Henrik Nordstrom <>
Date: Wed, 13 May 1998 00:15:38 +0200

Dirk Vleugels wrote:

> How much of a performance improve in comparison to a 1.1 squid? Does the
> threading pay of?

This is best answered with some hard numbers from my test machine:

                fill(1) read read
Squid 1.1.21 : 35 42 34
Squid 1.2b20-1: 42 105(2) 60

(1) Cache fill probably injured a major penalty from the local HTTP
server sharing one of the disks.
(2) Sequential read using 1.2b20-1 was CPU bound.

The test machine is a

Pentium 133, 32MB memory, RetHat Linux 5.0
local HTTP server (Apache)
No real network. All running local on one machine.

The test data consists of ~5500 objects with a total size of ~30MB.

Both Squid versions used identical squid.conf settings (apart from the
syntax difference).

Squid 1.1.21 is a stock Squid without any (or very small) modifications.
Squid 1.2b20-1 is my development version of Squid 1.2b20-1. See for a complete listing of all changes.
NUMTHREADS was set to 64.

All three tests is measured by tcp-banger. The fill test is utilizing 10
simultaneous connections and the read tests uses 60 (-n option to

sequential read == in the same order as used when filling the cache.
random read == in random order.

Henrik Nordström
Sparetime Squid Hacker
Received on Tue May 12 1998 - 15:35:44 MDT

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