By Raphael A. Finkel
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Extra info for An Operating Systems Vade Mecum
6, our Policies 41 simulation results, show that the penalty ratio and missed time for SPN are better than for RR, except for the shortest 15 percent of all processes, where the figures are still far better than for FCFS. 4 Preemptive shortest process next (PSPN) We saw that RR achieves a good penalty ratio by using preemption, and that SPN does even better by using extra information about each process. We would expect to do still better by combining these techniques. The PSPN preempts the current process when another process arrives with a total service time requirement less than the remaining service time required by the current process.
They require 1, 100, 1, and 100 seconds, respectively. 1 ❉ ❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉✂❉ ❊ ❊ ❊ ❊ ❊ ❊ ❊ ❊ ❊ ❊ ❊ The penalty ratio P for process C is indefensible. Any short process caught behind a long one will suffer a wait time much longer than the time it really needs to execute. Long processes, in contrast, will generally receive reasonable values for P , even if they have to wait behind a few other processes.
In fact, a minor improvement for short processes causes a disproportionate degradation for long processes. We will therefore be especially interested in comparing various policies with respect to how well they treat processes with different time requirements. The values we will get for the service measures under different policies will depend on how many processes there are, how fast they arrive, and how long they need to run. A fairly simple set of assumptions will suffice for our purposes. First, we will assume that processes arrive (into the view of the short-term scheduler) in a pattern described by the exponential distribution.
An Operating Systems Vade Mecum by Raphael A. Finkel
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