RE: [squid-users] Squid Performance (with Polygraph)

Hi Adrian,
        I've got diskd configured to be used for objects over 500k - the
datacomm run is all 13K objects so essentially it's doing nothing.
Interestingly though I see the same stuff if I use ufs only, or just diskd.

I am using kqueue - I will try to get you stats on what that shows. If I
push it too far (1800 RPS) I can see squid visibly failing - error messages,
too much drive load etc. But at 1200RPS it runs fine for > 10 minutes - I'd
really like to get this solved as I think there is potential for a lot of
performance.

I've just run a test now at 300RPS and it failed after 80 minutes -- very
weird...

I'll try to get you all the stats I can tomorrow morning

Thanks again for the help
Dave

-----Original Message-----
From: Adrian Chadd [mailto:adrian@creative.net.au]
Sent: Thursday, November 08, 2007 5:37 PM
To: Dave Raven
Cc: 'Adrian Chadd'; squid-users@squid-cache.org
Subject: Re: [squid-users] Squid Performance (with Polygraph)

On Thu, Nov 08, 2007, Dave Raven wrote:
> Hi,
> I've been looking for a way to do the profiling, but I'm stuck with
> FreeBSD 4 - any ideas? Cache_mem is at 96mb, its almost definitely getting
> filled immediately - I've also tried setting it to 8 just to be sure, no
> difference...

Hm. FreeBSD-4 doesn't have pmc, but pmc is proving to be a bit useless when
profiling high-syscall-throughput applications. tsk.

> It's a bit difficult to graph -- disk IO I can see with iostat, it seems
to
> stay the same even after my slow down period...

I'll assume you're running with kqueue. I'd run systat -vmstat 1 under
freebsd
and watch all the key values, see what peaks.

Also, are you using diskd when you're not using COSS?

Adrian

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