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After sorting the step stack so that dependencies can be popped before their dependants are popped, there is still a situation left to handle correctly: Example: A depends on: B C D depends on: E F They will be ordered like this: A B C D E F If there are 6+ cores, then all of them will be evaluated at once, incorrectly evaluating A and D before their dependencies. Starting evaluation of F and then E is correct, but waiting until they are done is not correct because it should start working on B and C as well. This commit solves the problem by computing dependants in the dependency loop checking logic, and then having workers queue up their dependants when they finish their own work.