add high and low priority flags to lepton utility for more reliable benchmarking #66
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The later gen Intel CPUs can run threads on p-cores or e-cores, which have very different performance characteristics. Windows uses the thread priority to decide which core to run on, so if we set a high priority it will run on the p-core and if we set a low priority it will run on the e-core.
This allows us to run perf benchmarks with less variance on CPU time to make it easier to estimate performance differences.