Modeling and Optimization of Meta-Caching
Dongyu Liu, Songqing Chen, Bo Shen · 2008
Abstract— The increase of aggregate Internet bandwidth andthe rapid development of 3G wireless networks demand ef-ficient delivery of multimedia objects to all types of wirelessdevices. To handle requests from wireless devices at runtime, thetranscoding-enabled caching proxy has been proposed to savetranscoded versions to reduce the intensive computing demandedby online transcoding. Constrained by available CPU and storage,existing transcoding-enabled caching schemes always selectivelycache certain transcoded versions, expecting that many futurerequests can be served from the cache. But such schemes treatthe transcoder as a black box, leaving no room for flexible controlof joint resource management between CPU and storage. In thispaper, we first introduce the idea of meta-caching by lookinginto a transcoding procedure. Instead of caching certain selectedtranscoded versions in full, meta-caching identifies intermediatetranscoding steps from which certain intermediate results (called metadata