Discussion
Why is the number of nodes expanded used to compare search algorithms?
Answer: C
Counting expansions gives a measure that does not change with processor speed, programming language or coding style, so published comparisons remain meaningful. Wall clock time still matters in practice and both are usually reported. Generation, testing and frontier management are also performed, and memory follows the frontier rather than the expansions. Choosing a machine independent measure is what allows results from different laboratories and decades to be compared at all.
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