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We introduce a task-based programming model and runtime system that exploit the observation that not all parts of a program are equally significant for the accuracy of the end-result, in order to trade off the quality of program outputs for increased energyefficiency. This is done in a structured and flexible way, allowing for easy exploitation of different points in the quality/energy space, without adversely affecting application performance. The runtime system can apply a number of differentdoi:10.1145/2688500.2688546 dblp:conf/ppopp/VassiliadisPCALBVN15 fatcat:3iryidbhjvbqhacnzb3reyy3qq