Sampling frequency
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Lockstep sampling
https://stackoverflow.com/questions/45470758/what-is-lockstep-sampling
Samples do not need to be frequent. If some "bottleneck" takes 30% of time, then even if only 20 random samples are taken, the chance that it will be exposed on two or more of those samples is 99.2% Check here.
https://stackoverflow.com/questions/45470758/what-is-lockstep-sampling#comment77932049_45471031