Abstract
In this paper, we propose a system-level design methodology for the efficient exploration of the architectural parameters of the memory sub-systems, from the energy-delay joint perspective. The aim is to find the best configuration of the memory hierarchy without performing the exhaustive analysis of the parameters space. The target system architecture includes the processor, separated instruction and data caches, the main memory, and the system buses. To achieve a fast convergence toward the near-optimal configuration, the proposed methodology adopts an iterative local-search algorithm based on the sensitivity analysis of the cost function with respect to the tuning parameters of the memory sub-system architecture. The exploration strategy is based on the Energy-Delay Product (EDP) metric taking into consideration both performance and energy constraints. The effectiveness of the proposed methodology has been demonstrated through the design space exploration of a real-world case study: the optimization of the memory hierarchy of a MicroSPARC2-based system executing the set of Mediabench benchmarks for multimedia applications. Experimental results have shown an optimization speedup of 2 orders of magnitude with respect to the full search approach, while the near-optimal system-level configuration is characterized by a distance from the optimal full search configuration in the range of 2%.
William Fornaciari
Associate Professor
William Fornaciari has published six books and over 200 papers, earning five best paper awards, an IEEE certification, and three international patents on low power design. Since 1997, he has participated in 18 EU-funded projects. His research focuses on multi/many-core architectures, NoC, low power design, and more.
Vittorio Zaccaria
Associate Professor
I am an associate professor at Politecnico di Milano and I have worked in embedded processor architecture R&D for one of the top semiconductor companies in the world. My group is currently working on topics related to embedded systems (hardware and software), security, cryptography, operating systems.