Abstract-The complexity of large Chip Multiprocessors (CMP) makes design reuse a practical approach to reduce the manufacturing and design cost of high-performance systems. This paper proposes techniques for static task mapping onto general-purpose CMPs with multiple pre-defined voltage islands for power management. The CMPs are assumed to contain different classes of processing elements with multiple voltage/frequency execution modes to better cover a large range of applications. Task mapping is performed with awareness of both on-chip and off-chip memory traffic, and communication constraints such as the link and memory bandwidth. Besides proposing a linear programming model for small systems, a novel mapping approach based on Extremal Optimization is proposed for large-scale CMPs. This new combinatorial optimization method has delivered very good results in quality and computational cost when compared to the classical simulated annealing.
The architecture definition, design, and validation of the interconnect networks is a key step in the design of modern on-chip systems. This paper proposes a mathematical formulation of the problem of simultaneously defining the topology of the network and the message routes for the traffic among the processing elements of the system. The solution of the problem meets the physical and performance constraints defined by the designer. The method guarantees that the generated solution is deadlock free. It is also capable of automatically discovering topologies that have been previously used in industrial systems. The applicability of the method has been validated by solving realistic size interconnect networks modeling the typical multiprocessor systems.
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