The performance of caching systems in general, and Internet caches in particular, is evaluated by means of the user-perceived service speed, reliability of downloaded content, and system scalability. In this dissertation, we focus on optimizing the speed of service, as well as on evaluating the reliability and quality of data sent to users. In order to optimize the service speed, we seek optimal replacement policies in the first part of the dissertation, as it is well known that download delays are a direct product of document availability at the cache; in demand-driven caches, the cache content is completely determined by the cache replacement policy. In the literature, many ad-hoc policies that utilize document sizes.
http://lib.umd.edu/drum/bitstream/1903/3...d-3258.pdf