Rybkas kn/s figure doesn increase much when she runs on machines with more processors, compared to other programs. Does this mean that she scales worse on such hardware?
No. Rybka’s kn/s on multi-processor machines reflects the estimated multi-processor efficiency, so that her kn/s figures provides a true speedup. Other engines typically display literal node counts, which include many “wasted” nodes, and this can give a false impression of a better multi-processor scaling.
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