hit rate drops with time when simple workload is used

From: Shuowen Yang (syang@doongo.com)
Date: Fri Apr 13 2001 - 16:40:01 MDT

Hi,

I found that hit rate drops with time considrably when simple
workload is used. Our system has a very large disk to
cache objects, no swapping happened. Polygraph did not
show any error message or warning in the test period.
Testing period : 20 min
Req_rate : 20 /s
DHR: 55%
In the first five minute, hit rate is around 55%, at the end of
the test hit rate is around 22%.
Any suggestions. Thanks.

S. Yang

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