Re: About the web polygraph to test squid performance

On Fri, 2007-06-01 at 09:05 +0800, Leon Xiang Li wrote:
> Thanks a lot for your helpful reply. I will try mix-4 instead .
>
> Actually I just set a simple test: three server , one running squid ,
> another two running ploysrv , poylclt seperately.
>
> Can you give me some clue about how to modify PolyMix-4.pg?
>
>
> how can I set IP ?
>
> client_side = {
> addr_space = [ 'lo0::10.101.0-123.1-250/22' ];
> hosts = [ '172.16.101.61-62' ]; // replace with IPs of
> your PCs
> };
> server_side = {
> addr_space = [ 'lo0::10.101.128-251.1-250:80/22' ];
> hosts = [ '172.16.101.191-192' ]; // replace with IPs of
> your PCs
> };
>

You can usually leave the addr_space intact (unless the hard coded
addresses conflict with other local addresses or the interface name is
wrong). The hosts need to be set to the primary IP addresses of the
client and server box. The HOWTO describes these modifications in
Section 5:

http://www.measurement-factory.com/docs/PolyMix-4/

> What is the reasonable value for peak_req_rate & FillRate ?

Depends on your Squid and its box. I would start with 10 requests per
second, just to make sure everything works. Filling at that rate will
take for ever so stop the test once you see that it is making progress
without errors. See cache-off results for some ideas regarding Squid
(and other proxy) performance; adjust to take into the account modern
hardware:

http://www.measurement-factory.com/results/

As for the fill rate, you can try setting it to 100% of peak, but Squid
may not survive mostly-misses loads if your peak rate is high. 50% is
probably safe; you may want to double check with Squid configs at the
cache-off. Please note that the value may depend on your Squid cache_dir
type.

> How about if I have no dns server in my private network?
> Can I ignore it?

You can disable DNS. Searching Polygraph site yields the following email
with specific instructions. I hope it is still valid:
http://www.web-polygraph.org/mail-archive/users/200203/0004.html

Good luck,

Alex.

> Alex Rousskov wrote:
> > On Thu, 2007-05-31 at 20:19 +0800, Leon Xiang Li wrote:
> >
> >> I use polymix-1.pg to test the squid preformance.
> >
> > You really should not. Please use PolyMix-4 or, at the very least,
> > PolyMix-3.
> >
> >> But there is no much document available about the meaning of pgl
> >> configuration file and working theory of polygraph.
> >
> > You will find workload descriptions and PGL reference at
> > http://www.web-polygraph.org/docs/workloads/
> > http://www.web-polygraph.org/docs/reference/pgl/
> >
> > The HOWTO documents and cache-off reports linked from the workload pages
> > may be very useful as well. You will find all our public benchmarking
> > results at http://www.measurement-factory.com/results/
> >
> > Finally, Appendix D of Duane Wessel's Squid book talks about Squid
> > performance testing with Polygraph: http://squidbook.org/
> >
> >> But after 1 hour, it still runing and in i-warm phase.
> >
> > I do not remember much about PolyMix-1 (it was written even before PGL),
> > but it is possible that your robots cannot contact all the origin
> > servers and keep trying. If you insist on using PolyMix-1, please use
> > verbosity level 10 and post console logs for further assistance. I would
> > not recommend relying on PolyMix-1 results though.
> >
> > Thank you,
> >
> > Alex.
> >
> >
Received on Fri Jun 01 2007 - 17:18:36 MDT