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From Apache Wiki <wikidi...@apache.org>
Subject [Db-derby Wiki] Update of "DerbyLruCacheManager" by GokulSoundararajan
Date Mon, 31 Jul 2006 18:47:55 GMT
Dear Wiki user,

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The following page has been changed by GokulSoundararajan:

   1. '''CLOCK-Pro: an effective improvement of the CLOCK replacement''' - Song Jiang, Feng
Chen, and Xiaodong Zhang [http://www.cs.wm.edu/hpcs/WWW/HTML/publications/papers/TR-05-3.pdf
  == Status/Updates ==
+ === July 31, 2006 ===
+ With some simple code changes, I modified the mirrored cache implementation to have almost
no overhead (only 1% now).
+ I have posted the results of my Zipf workload that I execute through the {{{T_CacheService}}}
unit test. I'm using an approximation to ClockPro which gives pretty good performance. It
is comparable to my earlier results that I got from simulation. The ClockPro approximation
is like 2Q but the LRU lists are replaced with Clock. This avoids the overhead of shifting
items to the top of the stack. I'll post more details later.
+ See the results of the mirrored cache implementation compared to the original Clock already
in Derby.
+ Graphs:
+ [http://www.eecg.toronto.edu/~gokul/soc/final-impl-results.png PNG]
+ [http://www.eecg.toronto.edu/~gokul/soc/final-impl-results.pdf PDF]
  === July 21, 2006 ===

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