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Milan Broz authored
Code based on patch by Ondrej Mosnacek The new benchmark works as follows: Phase 1: It searches for smallest parameters, such that the duration is 250 ms (this part is quite fast). Then it uses that data point to estimate the paramters that will have the desired duration (and fulfill the basic constraints). Phase 2: The candidate parameters are then measured and if their duration falls within +-5% of the target duration, they are accepted. Otherwise, new candidate parameters are estimated based on the last measurement and phase 2 is repeated. When measuring the duration for given parameters, the measurement is repeated 3 or 4 times and a minimum of the measured durations is used as the final duration (to reduce variance in measurements). A minimum is taken instead of mean, because the measurements definitely have a certain lower bound, but no upper bound (therefore mean value would tend to be higher than the value with highest probability density). The actual "most likely" duration is going to be somewhere just above the minimum measurable value, so minimum over the observations is a better estimate than mean. Signed-off-by: Milan Broz <gmazyland@gmail.com>
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