Analysis of Differential Synchronisation's Energy Consumption on Mobile Devices

Synchronisation algorithms are central to collaborative editing software. As collaboration is increasingly mediated by mobile devices, the energy eÿciency for such algorithms is interest to a wide community of application developers. In this paper we explore the dierential synchronisation (disync) algorithm with respect to energy consumption on mobile devices. Discussions within this paper are based on real usage data of PDF annotations via the Mendeley iOS app, which requires realtime synchronisation. We identify three areas for optimising disync: a.) Empty cycles in which no changes need to be processed b.) tail energy by adapting cycle intervals and c.) computational complexity. Following these considerations, we propose a push-based disync strategy in which synchronisation cycles are triggered when a device connects to the network or when a device is notified of changes.