priority scheduling
时间: 2023-04-12 16:04:33 浏览: 69
优先级调度是一种进程调度算法,它根据进程的优先级来决定哪个进程先执行。优先级可以根据进程的重要性、紧急程度、资源需求等因素来确定。在优先级调度中,具有最高优先级的进程先执行,如果有多个进程具有相同的优先级,则按照先来先服务的原则进行调度。
相关问题
scheduling priority
调整调度优先级是一种操作系统提供的功能,可以控制进程或线程在系统中的调度顺序。通过提高或降低进程或线程的调度优先级,可以影响它们在系统中被执行的频率和顺序。
在大多数操作系统中,可以使用特定的系统调用或命令来修改进程或线程的调度优先级。具体的方法可能因操作系统而异。
在Linux系统中,可以使用nice命令来修改进程的优先级。该命令后面跟着要执行的
process p1 p2 p3 p4 p5 burst time 10 1 2 1 5 priority 3 1 3 4 2
There are different scheduling algorithms that can be used to schedule these processes based on their burst time and priority. Here are some examples:
1. Priority scheduling: In this algorithm, the processes are scheduled based on their priority. The process with the highest priority gets executed first. If two or more processes have the same priority, then the one with the shortest burst time is executed first. Using this algorithm, the order in which the processes will be executed is:
P2 (burst time: 1, priority: 1)
P5 (burst time: 5, priority: 2)
P1 (burst time: 10, priority: 3)
P3 (burst time: 2, priority: 3)
P4 (burst time: 1, priority: 4)
2. Shortest job first (SJF) scheduling: In this algorithm, the processes are scheduled based on their burst time. The process with the shortest burst time gets executed first. If two or more processes have the same burst time, then the one with the highest priority is executed first. Using this algorithm, the order in which the processes will be executed is:
P2 (burst time: 1, priority: 1)
P4 (burst time: 1, priority: 4)
P3 (burst time: 2, priority: 3)
P5 (burst time: 5, priority: 2)
P1 (burst time: 10, priority: 3)
3. Shortest job first with aging: This is a variation of the SJF algorithm where the priority of a process increases as it waits in the queue. This is done to prevent starvation of processes with high burst time. Using this algorithm, the order in which the processes will be executed is:
P2 (burst time: 1, priority: 1)
P4 (burst time: 1, priority: 2)
P3 (burst time: 2, priority: 4)
P5 (burst time: 5, priority: 5)
P1 (burst time: 10, priority: 6)