Re: Squid hangs weekly on SUN Ultra

From: Dancer <>
Date: Mon, 30 Mar 1998 17:46:58 +1000

Ermm, no. If a reboot won't fix it, then your operating system has blown
up. Squid _may_ have contributed to that, but ultimately, it ain't
squid's fault, IMO.

Your machine obviously has deeper problems, and any program that applies
that level of network/disk/cpu workload is going to break it. Again,


Andreas Strotmann wrote:
> Hi,
> we've been wrestling with this problem for months now, and it's not
> getting better. Can anybody help?
> We're running Squid 1.20 on a 2-processor (200 MHz) Sun UltraSparc running
> Solaris 2.5.1; the problem I'm reporting was first observed running Squid
> 1.15 and later running 1.18. Squid has been configured to use 4096 FDs,
> and has been observed using at least 2100 FDs.
> About once a week, apparently during a peak-load period, Squid will
> literally freeze. It can't be killed; only rebooting the machine works.
> Analyzing the system core dump has revealed that things are locked in an
> I/O wait state on that machine. After a while, if the "crash" has gone
> undetected that long, even logging in becomes impossible.
> The machine is a dedicated proxy server. It's got 16 GB of disk space on
> 4 disks, 700+ MB of main memory, fresh CPUs, ATM. It serves the
> equivalent of a 1.5-2Mbit connection during peak loads.
> According to a NetCache technical report I recently read, that appears to
> be more than a machine with this configuration running Squid ought to be
> able to deliver. However, while we used to see a slow-down and gradual
> fading of performance when the machine started to get near its performance
> limit when we started using squid, the current kind of sudden total
> breakdown that doesn't even cause an automatic reboot is a most
> frustrating situation. It is made the worse for the fact that we're a
> university that cannot afford to have its computer center offer a
> 24hr,365d service. Proxy-Autoconfig doesn't work in this situation,
> because the browser doesn't recognize that the proxy is a living-dead
> zombie...
> We've tried the following:
> - Sun sent new CPUs
> - the disks have been replaced
> - all (minor) other services have been removed from the machine
> to no avail. I'm writing this as the proxy server spent another weekend
> in this mode (Friday just after all the staff have left is a typical time
> for this to happen:-( ).
> I know that Squid is running at its very limits on our machine;
> unfortunately, that means that it can only service 25% or so of our total
> WAN traffic. Is this the kind of behaviour to expect when a machine
> running Squid reaches its limits?
> Any help is appreciated!!
> Thanks,
> Andreas
> --
> Andreas Strotmann / ~~~~~~ \________________A.Strotmann@Uni-Koeln.DE
> Universitaet zu Koeln /| University of Cologne \
> Regionales Rechenzentrum| Regional Computer Center \
> Robert-Koch-Str. 10 /| Tel: +49-221-478-5524 |\ Home: -221-4200663
> D-50931 Koeln __|__ FAX: +49-221-478-5590 |__________~~~~~~~~~~~~

Did you read the documentation AND the FAQ?
If not, I'll probably still answer your question, but my patience will
be limited, and you take the risk of sarcasm and ridicule.
Received on Sun Mar 29 1998 - 23:55:46 MST

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