Re: Stop - Start - Stop - Start

Ah, now here's an off-the-wall suggestion. You could try loading the profiling
patches into squid, and see where it's spending all it's time _that_ way.
(alternatively, compile and link with -g, and when it goes for it's walk among the
fairies, poke it with a signal that'll cause it to core dump, then get a stack
backtrace from the core).

D

David Richards wrote:

> On Mon, 16 Feb 1998, Bruce Campbell wrote:
>
> > On Mon, 16 Feb 1998, David Richards wrote:
> >
> > > I have a problem that concerns me. Squid seems to work fine then,
> > > it will stop serving requests, eventually though, it will continue and
> > > serve the request.
> >
> > Hmmm, sounds like DNS lookups (normally what ours pause for anyway).
>
> I don't think ours is DNS lookups. Because it can pause for up to
> minutes sometimes, and in that time I can ping the site to check if it is
> responding, and yes it does.
>
> >
> > > When I do a "tail -f access.log", it seems to pause. A lot of the
> > > time it seems to do it after an ICP_QUERY but, that may just be a
> > > co-incidence, because I have seen it on non-ICP requests. This event is
> > > occurring on all three of our proxies, and I find that more often that not
> > > this event is occuring on two of three proxies simultaneously [No spell
> > > checker in pine :-) ]
> >
> > q: when multiple proxies block at the same time, is it only on an ICP
> > query, or on a normal end-user query (handled by that proxy)
>
> Yes it seems to be on an ICP query most times, not all time however.
>
> >
> > q2: If it is on an ICP query, is it just between them only, or to the
> > QuestNet proxies as well?
>
> We are currently not using the Questnet proxies as parents, currently they
> are just way too overloaded and slow.
>
> >
> > q3: anything consistent in the URL's being requested around such an error?
> > (remember, it could be before or after the log entry it pauses on.)
>
> No nothing. There is not consistency between HTTP headers either. On an
> intereseting note, we are using a variant of the authenitcation code.
>
> >
> > > What is going on?
> >
> > No idea to be honest ;)
> >
> > --==--
> > Bruce.
> >
> > Systems Administrator
> > Hub Communications.
> >
> > (*laugh* a mere 100 metres between QUT and us, and 12 hops (via sydney)
> > network-wise)
> >
>
> -#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-
> David Richards Ph: +61 7 3864 4347
> Network Programmer Fax: +61 7 3864 5272
> Computing Services E-mail: dj.richards@qut.edu.au
> Queensland University of Technology
> Brisbane, Australia
> -#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-

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