On Thu, 10 Jun 2004, senthil wrote:
> 1.I tried changing the working_set_cap to a constant value. The hits
> time acheived was very high about 15 seconds.
>
> I tried again with the polymix configuration for working_set_cap.
> But now the time for a hit was good about 1 second. Any specific
> reasons??
There can be many reasons. Is your constant value larger or smaller
than PolyMix-4 value for the request rate you are using? Smaller
working set sizes are easier for the cache to handle. Is it possible
that you also changed something other than working_set_cap between the
two tests?
> 2.And also I have set the ProxyCacheSize to be 500MB only such that
> the Fill phase will not extend for a long time.Does this have any
> impact on response time and hit ratio??
Not properly filling the cache often has a significant effect on the
quality/reliability of all measurements, including response time and
measured hit ratio. Many caches perform much better when they are not
filled. In real world, the cache will be filled after some initial
warmup time; we want to test under realistic conditions and fill the
cache (twice).
> 3.If I need to have a higher hit ratio i need to change the
> recurrence value.am i right??
Yes, increasing recurrence ratio will increase _offered_ hit ratio.
Increasing cachability ratio will have the same effect. If you want to
increase _measured_ hit ratio, you need to find out why it is lower
than you want and go from there.
HTH,
Alex.
-- Protocol performance, functionality, and reliability testing. Tools, services, and know-how. http://www.measurement-factory.com/
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