> I'm no supercomputer expert. But for reliability, a lot of supercomputer simulations step through twice to "verify" the results. That means both simulations must be setup with the same settings, so that your floats all line up.
In such cases, the result of one simulation is not enough, and we do several ones with slightly different initial conditions, just to make sure that we don’t spend time analysing an outlier. Exact reproducibility is important to validate the codes running test suites, but for the purpose of using simulations to make predictions, it does not really matter as long as each simulation is physically accurate enough.
In such cases, the result of one simulation is not enough, and we do several ones with slightly different initial conditions, just to make sure that we don’t spend time analysing an outlier. Exact reproducibility is important to validate the codes running test suites, but for the purpose of using simulations to make predictions, it does not really matter as long as each simulation is physically accurate enough.