Running multiple applications optimally in terms of Quality of Service (e.g. performance and power consumption) on embedded multi-core platforms is a huge challenge. Moreover, current applications exhibit unpredictable changes of the environment and workload conditions which makes the task of running them optimally even more difficult. This dynamic trend in application runs will grow even more in future applications.
This Chapter presents an automated tool flow which tackles this challenge by a two-step approach: first at design-time, a Design Space Exploration (DSE) tool is coupled with a platform simulator(s) to get optimum operating points for the set of target applications. Secondly, at run-time, a lightweight Run-time Resource Manager (RRM) leverages the design-time DSE results for deciding an operating configuration to be loaded at run-time for each application. This decision is performed dynamically, by taking into consideration available platform resources and the QoS requirements of the specific use-case. To keep RRM execution and resource overhead at minimum, a very fast optimisation heuristic is integrated.
Application of this tool-flow on a real-life multimedia use case (described in Chap. 9) will demonstrate a significant speedup in optimisation process while maintaining desired Quality of Service.