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@PROCEEDINGS{Peer-to-Peer Networking and Applications,
     author = {Rizzo, Gianluca},
   keywords = {algorithms, energy efficiency, file distribution, P2P, performance},
      month = apr,
      title = {Energy-Optimal Collaborative File Distribution in Wired Networks},
       year = {2016},
  publisher = {Springer},
       issn = {1936-6442},
        url = {http://link.springer.com/article/10.1007%2Fs12083-016-0453-4},
        doi = {10.1007/s12083-016-0453-4},
   abstract = {The impact of the ICT sector in worldwide power consumption is an increasing
concern, motivating the research community to devote an important effort to devise
novel energy efficient networking solutions. Despite file distribution is responsible for a
major portion of the current Internet traffic, little effort has been dedicated to address
the issue of its energy efficiency so far. Most of the previous literature focuses on
optimizing the download time of file distribution schemes (e.g. centralized server-based
or distributed peer-to-peer solutions) while it is yet unclear how to optimize file
distribution schemes from the point of view of energy consumed.
In this paper, we present a general modelling framework to analyze the energy
consumption of file distribution systems in a controlled environment. First, we show that
the general problem of minimizing energy consumption in file distribution is NP-hard.
Then, for restricted versions of the problem, we establish theoretical bounds to minimal
energy consumption. Furthermore, we define a set of optimal algorithms for a variety of
system settings, which exploit the service capabilities of hosts in a P2P fashion. We
show that our schemes are capable of reducing at least 50\% of the energy consumed
by traditional (yet largely used) centralized distribution schemes, even when
considering effects such as network congestion and heterogeneous access speed
across nodes.}
}