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:- use_module(library(thread)).(can be autoloaded)
cpu_count. If this flag is absent or 1 or List has less than two elements, this predicate calls the corresponding maplist/N version using a wrapper based on once/1. Note that all goals are executed as if wrapped in once/1 and therefore these predicates are semidet.
Note that the the overhead of this predicate is considerable and therefore Goal must be fairly expensive before one reaches a speedup.