WIOWIZ hacks OpenROAD routing with parallel regions for 5.6x speedup—no code changes, just like every PM's dream pivot from hell

WIOWIZ has successfully parallelized OpenROAD detailed routing at the process level without modifying TritonRoute or OpenROAD itself, achieving a 5.6 times speedup. The company explored this approach as multithreading support was insufficient for large designs. By partitioning the design into routing regions and launching multiple OpenROAD processes in parallel, each routing a portion of the design, WIOWIZ overcame the limitations of shared routing state and unevenly distributed routing complexity. The key insight was to balance region partitioning by complexity, ensuring that routing effort was balanced across regions. This approach resulted in a significant reduction in routing time, from 644 seconds to 116 seconds. The achievement demonstrates that OpenROAD can scale beyond its default execution model, and significant routing speedups are possible without modifying the tool. This breakthrough has implications for the electronics design automation industry, showcasing the potential for external orchestration to extend open-source EDA tools safely and efficiently.