1. A method of assessing energy efficiency of a High-performance computing (HPC) system, comprising: selecting a plurality of HPC workloads to run on a system under test (SUT) with one or more power constraints, wherein the SUT includes a plurality of HPC nodes in the HPC system; executing the plurality of HPC workloads on the SUT; and generating a benchmark metric for the SUT based on a baseline configuration for each selected HPC workload and a plurality of measured performance per power values for each executed workload at each selected power constraint.