benchmark on a thermal limited, turbo-boost enabled machine is usually a very bad idea. (single socket, etc.) Edit: If you wish to microbenchmark - lock the CP

benchmark on a thermal limited, turbo-boost enabled machine is usually a very bad idea. (single socket, etc.) Edit: If you wish to microbenchmark - lock the CPU frequencies (core/uncore for intel), lock the voltage too and measure the power draw as well. You wish to use taskset too, depending how many cores the benchmark utilizes.