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As the software has a profound impact on power dissipation, the information scarcity of dynamic power dissipation impedes the progress of energy-efficient software design. We propose a set of software function level power analysis tools, SPAN to enable instrumentation for power analysis so that code "hot region" can be spotted for further optimization. Since the diversity of applications, we use different techniques to generate fine-grained power profile for applications.
On the other hand, we developed a light-weighted library, Safari( http://sourceforge.net/projects/mistsafari ) which is the original SPAN function APIs to profile an application. SPAN uses IPC as model input and generate power profile for the insrumented functions, e.g. to instrument the benchmark of IS in NPB benchmark suite, first, SPAN_initialize() is invoked. Then, use SPAN_start("function_name") right before the function entrance. Call SPAN_stop("function_name") after the function. Also, SPAN_stop() at the end.