Generating Energy-Efficient Source Code by Refactoring

Masterarbeit in der Abteilung Softwaretechnik


The increasing number of mobile devices, like smartphones and tablets, in households and industry is partly responsible for the increasing energy consumption. Meanwhile, the energy consumption for ICT exceeds 10 % of the total energy consumption in Germany. This 10 % can be categorized as households, industry, server and data centers, and mobile devices. The category mobile devices represent 11,6 % of the 10 %, so that it is the fourth biggest energy consumer of ICT. Thereby, the energy consumption of mobile devices accounts approximately 1 % of the German energy consumption. Furthermore, the prognosis for sale of mobile devices is positive and increases every year. On account of high energy consumption and demand of mobile devices, it is important to improve the energy-efficiency in this area to reduce energy costs for users and to save the environment.


One possibility to improve the energy-efficiency for mobile devices is to restructure applications in a way that they still use less energy. In this master thesis, it is done by a refactoring process. Thereby, energy-inefficient code parts are defined as energy refactorings and their analyzing and restructuring are described. Furthermore, applications will be validated by an energy measurement after restructuring to show their energy saving.

Prof. Dr. Andreas Winter (
M.Sc. Jan Jelschen (

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