On Wed, 22 May 2002 chin60@pchome.com.tw wrote:
> Our proxy server is based on polymix-3.pg and
> polygraph-2.5.4. We find the larger peak request rate is,
> the less hit ratio occurs. For example, our cache disk is 35GB
> peak request rate 200 => hit ratio 57%
> peak request rate 400 => hit ratio 49%
>
> And the response time of the two test results are OK, both under
> 2800 msec. Could someone tell us the reasons? thanks!
There may be several reasons, including the following:
- higher peak rate means larger working set size;
you proxy may need larger cache to keep more
objects that could be revisited
- some proxies serve fewer hits to reduce disk
bottleneck under overload conditions
Also, please note that a "good" mean response time for PolyMix-3
should be below 2 seconds (2.8sec is good for misses only; hits should
be much faster). Perhaps you were quoting miss response time
statistics though; ignore this paragraph in that case.
Alex.
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