Battery-aware dynamic voltage scaling in multiprocessor embedded system

Abstract — In a battery powered system, a primary design consideration is the battery lifetime. Profile of current drawn from a battery determines its lifetime. Recently in [4] dynamic voltage scaling has been applied to alter the battery load current profile in distributed systems to reduce battery charge consumption. Load current profile is changed by utilizing the slack in the execution of the scheduled tasks. In this paper we propose a new dynamic voltage scaling procedure that alters load current profile by considering the total battery current instead of the method of [4] that considers the current dawn by individual task with the latest finish times in the schedule. The task schedule is partitioned into steps defined in this work and the load currents during selected steps are targeted for reduction by scaling the supply voltage of the processing elements. Experimental results on a large set of task graphs show that battery charge consumption reductions of up to 89.80 % are achieved by the new algorithm. I