> The biggest constraint I've seen with scaling up these simulations is maintaining coherence of population dynamics across all of the processing units Agreed.

> The biggest constraint I've seen with scaling up these simulations is maintaining coherence of population dynamics across all of the processing units Agreed. For mine I purposefully avoided this problem by making the population+world relatively small (<100 creatures and a relatively finite space they could move in) so each pc handled one instance of a world and after each generation there was a process of sharing data so successful brains were available to each world for continued evolution. My dream was to scale this thing up significantly, but life intervened, maybe someday.