2010-008-distgreencoop - A Green Distributed Cooperation...

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A Green Distributed Cooperation for Network and Content Management Luca Chiaraviglio a , Ibrahim Matta b a Dipartimento di Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy b Computer Science Department, Boston University, 111 Cummington Street, Boston, MA 02215, USA Abstract We propose a distributed approach in which an Internet Service Provider (ISP) and a Content Provider (CP) cooperate to minimize total power consumption. Our solution is distributed between the ISP and the CP to limit shared information, such as network topology and servers load. In particular, we develop different algorithms adopting dual decomposition and Benders decomposition techniques. We investigate the performance of the proposed solutions on realistic case-studies. We compare our algorithms with a centralized model, whose aim is to minimize total power consumption. We first adopt convex functions to model power consumption of devices: all the distributed algorithms find optimal solutions in this scenario. We then introduce the possibility of powering off devices. Results show that in this case the distributed algorithms are close to the optimal solution, with a power efficiency loss less than 18%. For the proposed algorithms we speculate on the trade-off between the complexity of cooperation and that of the implementation. In particular, with the dual decomposition approach only the Lagrange multi- pliers associated with the traffic demands and users delay are shared between the ISP and CP, but a real implementation requires a trusted third-party server and careful tuning of parameters. On the contrary, with a Benders decomposition technique both the traffic demands and the ISP power consumption need to be shared, but this information is exchanged directly. Moreover, the parameters are easy to set, but the computational time grows linearly with the number of iterations. Finally, we investigate improvements to balance the power savings between the ISP and the CP. 1. Introduction Energy-efficient communication has become a challenging problem in the last few years. According to recent studies [1] the average temperatures in the world will consistently rise in the next century, global warming being the principle cause of this phenomenon. Therefore, actions to mitigate the release of CO 2 gases in the atmosphere are becoming imperative, and key processes to achieve this goal are the reduction of power consumption and improvements in energy-efficiency. Technical Report BUCS-TR-2010-008. Email addresses: [email protected] (Luca Chiaraviglio), [email protected] (Ibrahim Matta) Preprint submitted to Elsevier March 31, 2010
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Current estimates [2] show that the Information and Communication Technology sector (ICT) consumes between 2% and 10% of the worldwide energy consumption, and this trend is expected to grow even more in the future due to the diffusion of both networked and networking devices. The main energy consumers in the ICT field are users’ terminals, large data centers and telecommunication networks, including the Internet.
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