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Nodes per second (NPS)
a measure of the chess program's speed. But whereas comparing different version of the same program is fine, comparisons between different engines are more difficult, since programmers use different schemes of counting nodes. The reciprocal of NPS is time per node, which translates to processor cycles per node.
RPM gauge [1]

Counting Nodes

Some programs include incrementing the counter after a call to:

The first approach suffers from the fact that most of selectivity techniques, where a node is pruned completely, tend to improve nodes per second. The second approach is heavily dependent on the fact whether evaluation function is called in interior nodes or in the quiescence search only. The third overemphasizes the difference between legal and pseudo-legal move generation.

See also


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References

  1. ^ RPM gauge of an electric driven air compressor in the machine hall of Zollern II/IV Colliery, Dortmund Bövinghausen, Germany - part of The Industrial Heritage Trail, Image by Gerd Isenberg, September 18, 2016

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