ChipletPart: Scalable Cost-Aware Partitioning for 2.5D Systems

Abstract: Industry adoption of chiplets has been increasing as a cost-effective option for making larger high-performance systems. Consequently, partitioning large systems into chiplets is increasingly important. In this work, we introduce ChipletPart - a cost-driven 2.5D system partitioner that addresses the unique constraints of chiplet systems, including complex objective functions, limited reach of inter-chiplet I/O transceivers, and the assignment of heterogeneous manufacturing technologies to different chiplets. ChipletPart integrates a sophisticated chiplet cost model with its underlying genetic algorithm-based technology assignment and partitioning methodology, along with a simulated annealing-based chiplet floorplanner. Our results show that: (i) ChipletPart reduces chiplet cost by up to 58% (20% geometric mean) compared to state-of-the-art min-cut partitioners, which often yield floorplan-infeasible solutions; (ii) ChipletPart generates partitions with up to 47% (6% geometric mean) lower cost as compared to the prior work Floorplet; and (iii) for the testcases we study, heterogeneous integration reduces cost by up to 43% (15% geometric mean) compared to homogeneous implementations. We also present case studies that show how changes in packaging or inter-chiplet signaling technologies can affect partitioning solutions. Finally, we make ChipletPart, the underlying chiplet cost model, and a chiplet testcase generator available as open-source tools for the community.