The intention is to establish a theoretical limit for the expense,
given some degree of concurrency. In reality, the expense should always
be greater, since the time is not just split by the number of cores;
rather we need to chain up existing jobs of various weight on the available
cores (which is a special case of the box packing problem).
With this formula, an ideal weight factor can be determined for each level,
and then summing up the sequence of levels gives us a guess for a sensible
timing for the overall scheduler
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