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Cost-Efficient, Utility-Based Caching of Expensive Computations in the Cloud

Benjamin Byholm, Fareed Jokhio, Adnan Ashraf, S├ębastien Lafond, Johan Lilius, Ivan Porres, Cost-Efficient, Utility-Based Caching of Expensive Computations in the Cloud. TUCS Technical Reports 1121, TUCS, 2014.


We present a model and system to decide on computing versus storing trade-offs in the Cloud using von Neumann-Morgenstern lotteries. We use the decision model in a video-on-demand system providing cost-efficient transcoding and storage of videos. Video transcoding is an expensive computational process that converts a video from one format to another. Video data is large enough to cause concern over rising storage costs. In the general case, our work is of interest when dealing with expensive computations that generate large results that can be cached for future use. Solving the decision problem entails solving two sub-problems: how long to store cached objects and how many requests we can expect for a particular object in that duration. We compare the proposed approach to always storing and to our previous approach over one year using discrete-event simulations. We observe a 72 % cost reduction compared to always storing and a 13 % reduction compared to our previous approach. This reduction in cost stems from the proposed approach storing fewer unpopular objects when it does not regard it as cost-efficient to do so.


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BibTeX entry:

  title = {Cost-Efficient, Utility-Based Caching of Expensive Computations in the Cloud},
  author = {Byholm, Benjamin and Jokhio, Fareed and Ashraf, Adnan and Lafond, S├ębastien and Lilius, Johan and Porres, Ivan},
  number = {1121},
  series = {TUCS Technical Reports},
  publisher = {TUCS},
  year = {2014},

Belongs to TUCS Research Unit(s): Embedded Systems Laboratory (ESLAB), Software Engineering Laboratory (SE Lab)

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