Measuring Hyper-Threading and Turbo Boost

This post details an experiment measuring the performance impact of AMD's Simultaneous Multithreading (SMT) and Core Performance Boost (CPB) on AMD EPYC 7642 processors. It quantifies the improvements in requests per second and latency in both simulated and production environments, and analyzes power consumption. The findings indicate that SMT provides significant performance gains with minimal power increase, while CPB offers further throughput and latency improvements at a higher power cost. The experiment also highlighted tail latency issues with SMT alone and the importance of normalizing performance by CPU utilization for accurate comparisons.