Design-space exploration and runtime resource management for multicores

  • Authors:
  • Giovanni Mariani;Gianluca Palermo;Vittorio Zaccaria;Cristina Silvano

  • Affiliations:
  • ALaRI - University of Lugano, Switzerland;Politecnico di Milano, Italy;Politecnico di Milano, Italy;Politecnico di Milano, Italy

  • Venue:
  • ACM Transactions on Embedded Computing Systems (TECS) - Special issue on application-specific processors
  • Year:
  • 2013

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Abstract

Application-specific multicore architectures are usually designed by using a configurable platform in which a set of parameters can be tuned to find the best trade-off in terms of the selected figures of merit (such as energy, delay, and area). This multi-objective optimization phase is called Design-Space Exploration (DSE). Among the design-time (hardware) configurable parameters we can find the memory subsystem configuration (such as cache size and associativity) and other architectural parameters such as the instruction-level parallelism of the system processors. Among the runtime (software) configurable parameters we can find the degree of task-level parallelism associated with each application running on the platform. The contribution of this article is twofold; first, we introduce an evolutionary (NSGA-II-based) methodology for identifying a hardware configuration which is robust with respect to applications and corresponding datasets. Second, we introduce a novel runtime heuristic that exploits design-time identified operating points to provide guaranteed throughput to each application. Experimental results show that the design-time/runtime combined approach improves the runtime performance of the system with respect to existing reference techniques, while meeting the overall power budget.