In preemptive multitasking you are trying to get all the work done as quickly as possible, but with FAIR and similar systems you want to make sure that a single

In preemptive multitasking you are trying to get all the work done as quickly as possible, but with FAIR and similar systems you want to make sure that a single client/user/resource cannot steal an inordinate amount of capacity. I do not think languages/runtimes typically implement that kind of prioritization/limiting mechanism.