Abstract
We consider software architectural transformations in the context of the multi-process software style driven by an operating system (OS), which is very commonly employed in energy-sensitive embedded systems. We propose a systematic methodology for applying these transformations to derive an energy-optimized architecture for any given embedded software. It consists of: (i) constructing a software architecture graph representation, (ii) deriving initial energy and performance statistics using a detailed energy simulation framework, (iii) constructing sequences of atomic software architectural transformations, guided by energy change estimates derived from high-level energy macro-models, that result in maximal energy reduction, and (iv) generation of program source code to reflect the optimized software architecture. We employ a wide suite of software architectural transformations whose effects span the application-OS boundary, including how the program functionality is structured into architectural components (e.g., application processes, signal handlers, and device drivers) and connectors between them (inter-component synchronization and communication mechanisms).
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