Thèse soutenue

Contribution à l'étude de l'efficacité énergétique des services TIC

FR
Auteur / Autrice : Sébastien Schinella
Direction : Jean-Pierre Frangi
Type : Thèse de doctorat
Discipline(s) : Sciences de la terre, de l'environnement et des planètes
Date : Soutenance en 2014
Etablissement(s) : Paris 7

Résumé

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This thesis deals with modeling and optimizing the energy efficiency of the ICT (Information and Communication Technologies) services, and applies a transparent and modular method, which is recognized for the energetic fields. A service is split into generic and independent operations for which specific consumptions are calculated with accessible and qualified raw data. Then we determine the natural specific variables that act on the consumption, in order to target ways to optimize the energy consumption. The method has been tested on a telemeeting service : its use phase consumes 1230 kJ of electricity per hour of meeting and per user. This consumption has been compared with the one of a business trip. For a 2 hours meeting, it appears for a user that for a trip of more than 5 km with public transport, it is better to use the tele-meeting. The parameters that act the most on the consumption have been put ahead : the utilization rate of the equipment and their idle consumption. The variation of the consumption with the load (for the PCs, servers and access networks) has been included to the model. The manufacturing consumption has been assessed at 933 kJ of electricity per hour of meeting and per user. A huge part is caused by the chips which constitute the equipment (CPU and RAM). We have shown that to manufacture them, the consumption per cm2 of chip had been overestimated by a factor 5 in the studies and databases still used, which caused an overestimation of the computer manufacturing consumption; The method has then been extended to another service : the e-mail.