SJF Scheduling:选择下一次CPU执行期最短的进程执行,分为两种,nonpreemptive 非抢占式的 和 preemptive 抢占式的。 抢占式-Shortest-Remainging-Time-First(SRTF) 最短剩余时间优先 SJF可以获得最小的平均等待时间。 Example of Non-Preemptive SJF: Example of Preeptive SJF: 确定下一次CPU执行期的长短(Determin...
Multi-level FeedBack queue-scheduling algorithm, however, allows a process to move between queues. The idea is to separate processes with different cpu-burst characteristics. If a process uses too much cpu time, ti will be moved to a lower-priority queue....
The aim of this assignment is to investigate the performance of different CPU scheduling algorithms. You will use a discrete event simulator to conduct experiments on different processor loads and schedulers, and analyse the results to determine in which situations each scheduling algorithm works most ...
waitingstate to the等待状态切换到readystate(for example, completion of I/O).就绪状态时(例如,I / O完成)。 terminates.终止时。 In circumstances 1 and 4, there is no choice in terms of scheduling. A new process(if one exists in the ready queue) must be selected for execution. There is ...
Scheduling Example: Process Burst Time P 1 24 P 2 3 P 3 3 Suppose that the processes arrive in the order(假定进程到达顺序如 下): P 1 , P 2 , P 3 The Gantt Chart for the schedule is(该调度的Gantt图为): Waiting time(等待时间)for P 1 = 0; P 2 = 24; P 3 = 27 Average...
A CPU Scheduling Algorithm Simulator[A].2007.S. Suranauwarat, "A CPU Scheduling Algorithm Simulator", Proceedings. of the 37th ASEE/IEEE Frontiers in Education Conference, Milwaukee, Wisconsin, USA(2007) :19-24Suranauwarat S.A CPU scheduling algorithm simulator. The 37~(th)Annual Frontiers ...
This scheduling method is used by the Microsoft Windows 3.1 and by the Apple Macintosh operating systems.It is the only method that can be used on certain hardware platforms because It does not require the special hardware(for example a timer) needed for preemptive scheduling....
CPUSchedulingTypes •Longtermscheduling –Thedecisiontoaddtothepoolofprocessestobeexecuted •Mediumtermscheduling –Thedecisiontoaddtothenumberofprocessesthatare partiallyorfullyinmainmemory •Shorttermscheduling –Thedecisionastowhichavailableprocesswillbeexecutedby ...
6.2 Explain the difference between preemptive and nonpreemptive scheduling. 解释一下抢占式调度和非抢占式调度的区别。 答: 教材P263 CPU-scheduling decisions may take place under the following four circumstances: When a process switches from the running state to the waiting state (for example, as ...
(CPU) or a range of CPUs, so that the process or thread will execute only on the designated CPU or CPUs rather than any CPU. This can be viewed as a modification of the native central queue scheduling algorithm in a symmetric multiprocessing operating system. Each item in the queue has ...