TY - GEN AU - O'Sullivan,Barry AU - Tsachouridis,Vassilios A. AU - Rea,Susan AU - Ignacio Torrens,J. AU - Chen,Lydia Y. AU - Vojtech Zavrel,V AU - Pages,Enric AU - Grimes,Diarmuid AU - Townley,Jacinta AU - Scherer,Thomas AU - Lopez,Lara AU - Pesch,Dirk AU - Hensen,Jan AU - Engbersen,Ton TI - Chapter Globally Optimised Energy-Efficient Data Centres SN - 65988 PY - 2017/// PB - InTechOpen KW - Sustainability KW - bicssc KW - energy modelling, energy analysis, energy transparency, energy aware, software engineering N1 - Open Access N2 - A great deal of energy in Information and Communication Technology (ICT) systems can be wasted by software, regardless of how energy-efficient the underlying hardware is. To avoid such waste, programmers need to understand the energy consumption of programs during the development process rather than waiting to measure energy after deployment. Such understanding is hindered by the large conceptual gap from hardware, where energy is consumed, to high-level languages and programming abstractions. The approaches described in this chapter involve two main topics: energy modelling and energy analysis. The purpose of modelling is to attribute energy values to programming constructs, whether at the level of machine instructions, intermediate code or source code. Energy analysis involves inferring the energy consumption of a program from the program semantics along with an energy model. Finally, the chapter discusses how energy analysis and modelling techniques can be incorporated in software engineering tools, including existing compilers, to assist the energy-aware programmer to optimise the energy consumption of code UR - https://library.oapen.org/bitstream/20.500.12657/49192/1/53053.pdf UR - https://library.oapen.org/bitstream/20.500.12657/49192/1/53053.pdf UR - https://directory.doabooks.org/handle/20.500.12854/70484 ER -