Re: Squid hangs weekly on SUN Ultra

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,
IMO.

D

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 |__________~~~~~~~~~~~~

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