CPU调度算法：SJF 西安交通大学 软件学院操作系统原理 Operating System Principle Operating System Principle 田丽华
OS.StudyLog.Ch8.CPU Scheduling.CPU调度 CPU调度的概念 调度时机 调度原则 一般系统中的调度算法 FCFS.先来先服务 SJF.短作业优先 HHRN.最高响应比优先 Round Robin(RR)轮循 MFQ多级反馈队列 FSS公平共享调度 实时调度 多处理调度与优先级反转 优先级反转 CPU调度的概念 进程都希望占用CPU去执行自己的工作,这就...
时间片轮转调度算法(RR) 时间片轮转调度算法(Round Robin Scheduling)是一种基于时间片的进程调度算法,旨在公平地分配CPU时间给各个就绪进程。 时间片轮转调度算法的工作过程如下: 将所有就绪进程按照到达时间的顺序放入就绪队列。 设定一个固定的时间片大小,通常为几十毫秒。 从就绪队列中选择一个进程,分配给它一个时...
Convoy Effec:假设有一个CPU密集型(大突发时间)进程,在准备队列中,其他几个进程的突发时间相对爆发时间较少,但有输入/输出(I/O)约束(经常需要I/O操作)。 然后会发生以下情况: I/O绑定的进程首先被分配CPU时间。由于它们的CPU密集度较低。由于它们的CPU密集度较低,很快就会被执行,然后转到I/O队列。 现在,CPU...
Performance and fairness are often at odds in scheduling.(性能和公平性在调度中往往是不一致的) 0x01 Algorithm1:先进先出 (FIFO) First Come, First Served (FCFS) (先到先得): Very simple and easy to implement. (简单且易于实施) Example: ...
OS Review Chapter 6: CPU Scheduling )◆Shortest-Job-First(SJF) ◆Priority ◆Round-Robin ◆Multilevel Queue ◆Multilevel Feedback QueueFCFSThe...Shortest-Remaining-Time-First(SRTF).SJFis provably optimal(最优的) – gives minimum average waiting time for a ...
In this tutorial, we will learn about the SJF i.e., Shortest Job First Scheduling Algorithm with the help of example.
"calculating the efficiency". are you talking in terms of cpu cycles, milliseconds, actual performance, perceived performance, etc. also, without more details about the processing environment, there really is no way to quantify the efficiency of any of these methods. for example, if t...
For example, suppose a size currently running process (Pold) is 150 KB and it takes 10 units of time for its execution. So, the burst time for any newly arrived process of size around 150 KB can be taken as 10 units of time.
A. P. U. Siahaan, "Comparison Analysis of CPU Scheduling FCFS, SJF and Round Robin," International Journal of Engineering Development and Research, vol. 4, no. 3, pp. 124-132, 20 November 2016.A. P. U. Siahaan, "Comparison Analysis of CPU Scheduling: FCFS, SJF and Round Robin," ...