How to measure hit ratio

[Dmitry Kurochkin]

Hi Erico.

On Wed, 13 Jul 2011 17:52:40 -0300, Erico Augusto Cavalcanti Guedes <eacg at cin.ufpe.br> wrote:
> Dears,
> 
> is there a way to measure the hit ratio of a cache experiment using
> polygraph tools, resources...

Sure.

> I'm loading a cache cluster of 4 nodes, and find a way to process squid
> access.log files together to establish  isn't a trivial task.
> 
> Lab is composed of 6 machines: One to execute polygraph-server, another to
> polygraph-client and 4 on cache cluster. If there is a way to gather hit
> ratio on polygraph-client machine, I'll spend less time and, who knows,
> watch Brazilian soccer team tonight! It's missing 4 hours to match start!
> I'm looking for the solution in Google, Search PG docs and with you...
> 

You should start with reading [1] and [2].  That should give you
information on how to run basic tests.  Hit ratio is reported on client
console during the test, see [3] for console output format.  A more
detailed information can be obtained from Polygraph logs (--log option
for polygraph-client(1) and polygraph-server(1)).  The simplest way to
do that is using polygraph-reporter(1) tool, documented at [4].  Just
run the reporter on both client and server logs, open index.html page in
the generated report, and click "Hit ratios" link.

While 4 hours should be enough to run some basic tests, I am afraid it
would take much more time to create and run a complex workload.

Note that to test multiple proxies you need to set them through PGL
Robot.*proxies fields, --proxy command line option accepts only a single
proxy address.  Moreover proxy selection is sticky, which means that
each Robot selects a proxy on startup and uses it during the entire
test.  That means you need to use multiple Robots to test several
proxies.  See [5] for more information on PGL Robot.*proxies fields.

I hope this would help and keep you busy till the soccer match :)

Regards,
  Dmitry

[1] http://www.web-polygraph.org/test/docs/userman/start.html
[2] http://www.web-polygraph.org/test/docs/userman/simple.html
[3] http://www.web-polygraph.org/test/docs/reference/output/console.html
[4] http://www.web-polygraph.org/test/docs/userman/reporting.html
[5] http://www.web-polygraph.org/test/docs/reference/pgl/types.html#type:docs/reference/pgl/types/Robot

> Best regards,
> 
> Erico.
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