By Raphael A. Finkel
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Post yr observe: First released September 30 2009
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Extra info for An Operating Systems Vade Mecum
We define ρ to be α / β. If ρ is 0, new processes never arrive, so the machine is completely idle. If ρ is 1, processes arrive on the average just exactly at the same rate as they can be finished. If ρ is greater than 1, processes are coming faster than they can be served. In this last case, we would expect the ready list to get longer and longer. In fact, even if ρ is just 1, the expected length of the ready list is unbounded. The value of ρ affects the response measures differently for different scheduling policies.
We will not discuss long-term scheduling as such in this book, but Chapter 4 is devoted to some of the resourcecontention issues that are central to that subject. Medium-term scheduling decides which running processes to block (deny service) temporarily, because resources (such as main store) are overcommitted or because a resource request cannot be satisfied at the moment. Chapter 3 discusses the intricacies of space management and describes policies for medium-term scheduling. Short-term scheduling, the subject of this chapter, decides how to share the computer among all the processes that currently want to compute.
It manages this feat by directing resources toward the process that will finish soonest, and will therefore shorten the ready list soonest. A short ready list means reduced contention, which leads to a low penalty ratio. 5 Highest penalty ratio next (HPRN) Non-preemptive scheduling policies seem to give unfair advantage either to very long processes (FCFS) or to very short ones (SPN). The HPRN method tries to be fairer and still not introduce preemption. As a new process waits in the ready list, its value of P , which starts at 1, begins to rise.
An Operating Systems Vade Mecum by Raphael A. Finkel