Impact of Thread and Frequency Scaling on Performance and Energy Efficiency: An Evaluation of Core i7-8700K Using SPEC CPU2017
Ranjan Hebbar S R, Aleksandar Milenković · 2019
This paper describes the results of measurement based studies focusing on performance and energy efficiency of SPEC CPU2017 speed and rate benchmark runs on the Intel's Core i7-S700K processor. We measure execution time and the total energy consumed during individual benchmark runs with 1 thread/copy (IT/IC) and 6 threads/copies (6T/6C) when the processor clock is set to its nominal frequency of 3.7 GHz. Next, we evaluate how changes in the processor clock frequency impact performance, energy efficiency, as well as a composite metric called PE that captures both performance and energy efficiency. We find that IT/IC benchmark runs at the nominal frequency achieve an optimal PE, whereas 6T/6C benchmark runs achieve optimal PE when running at 2.7 GHz.