An Trace-Driven Performance Prediction Method for Exploring NoC Design Optimization

The performance prediction for a NoC-based Chip Multi-Processor (CMP) is one of the main design concerns. Generally, there is a trade-off between accuracy and time overhead on the performance prediction of computer systems. In particular, the time overhead is proportional or exponential to the number of cores when using a cycle-accurate full-system simulation, such as gem5. In this study, we propose an accurate and scalable method to predict the influence of design NoC parameters on its performance. Our method counts the number of execution cycles when employing the target NoC based on the statistics of one-time execution of a full-system simulation using a fully-connected NoC. To evaluate the accuracy and execution time overhead, we use the case that randomly generates allocations of processors with 3D mesh topology NoC. Its Mean Absolute Percentage Error of the estimated cycles is about 4.7%, and the Maximum Absolute Percentage Error is about 8.5%.