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don't perform costly 'difference_update' on dependencies...
don't perform costly 'difference_update' on dependencies Scheduler: set1.difference_update(set2) can be very slow if set2 is large, even if set1 is empty, so use faster set1 = set1.difference(set2), and don't perform any difference operation on empty dependencies. The result was a dramatic reduction in throughput after the scheduler has routed many thousands of tasks, even with no task dependencies.
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r4141:6443bc1b
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