SchedulingThe method of exponential averaging can be used to increase the priority of jobsaccording to their waiting time.The average waiting time for a given set of processes is minimal when ShortestJob First (SJF) scheduling algorithm is used.0Priority inversion means that high-priority processes can be delayed or blockedby lower-priority processes.The service time is also known as the CPU burst.Round Robin (RR) scheduling can lead to starvation.

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Scheduling The method of exponential averaging can be used to increase the priority of jobs according to their waiting time. The average waiting time for a given set of processes is minimal when Shortest Job First (SJF) scheduling algorithm is used. Priority inversion means that high-priority processes can be delayed or blocked by lower-priority processes. The service time is also known as the CPU burst. Round Robin (RR) scheduling can lead to starvation.

Scheduling The method of exponential averaging can be used to increase the priority of jobs according to their waiting time. The average waiting time for a given set of processes is minimal when Shortest Job First (SJF) scheduling algorithm is used. Priority inversion means that high-priority processes can be delayed or blocked by lower-priority processes. The service time is also known as the CPU burst. Round Robin (RR) scheduling can lead to starvation.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Q 6:- an operating system uses SJF scheduling algorithm for preemptive scheduling of processes, consider the following set of processes, with their arrival times and length of the CPU burst times given in milliseconds and the priority of each process: Process Arrival Time Burst Time priority PO 1 5 1 P1 3 2 P2 1 P3 7 2 P4 2 1
The following processes are being scheduled using a preemptive, roundrobin scheduling algorithm. Each process is assigned a numericalpriority, with a higher number indicating a higher relative priority.In addition to the processes listed below, the system also has an idle task (which consumes no CPU resources and is identified as Pidle). Thistask has priority 0 and is scheduled whenever the system has no otheravailable processes to run. The length of a time quantum is 10 units.If a process is preempted by a higher-priority process, the preemptedprocess is placed at the end of the queue.
Suppose that the following processes arrive for execution at the time given below. Each process will run for the amount of time listed. Calculate average turnaround and average waiting time for these processes under Shortest remaining time first (SRTF)(preemptive) scheduling AlgorithmHints: turnaround time: The interval from the time of arrival of a process to the time of completionWaiting time: The sum of the periods spent waiting by a process in the ready queue
Consider the following processes schedule using RR Scheduling algorithm If the CPU scheduling policy is Round Robin with time quantum = 3 unit: Process Arrival time Burst Time P1 P2 P3 P4 P5 5 P6 4 3 1 2 5 6 6 7 9 2 Turn around time 3 Draw the ready queue, Gantt Chart for the schedule and find the TAT, WT, RT for each process then, find the Average waiting time, Response Time and the average turnaround time. Waiting Time Response Time
The following processes are being scheduled using a preemptive, roundrobin scheduling algorithm. Each process is assigned a numerical priority, with a higher number indicating a higher relative priority. In addition to the processes listed below, the system also has an idle task (which consumes no CPU resources and is identified as Pidle ). This task has priority 0 and is scheduled whenever the system has no other available processes to run. The length of a time quantum is 10 units. If a process is preempted by a higher-priority process, the preempted process is placed at the end of the queue. Thread Priority Burst Arrival P1 P2 P3 40 20 30 25 25 30 25 30 P4 P5 35 15 60 10 100 Р 10 10 105 a. Show the scheduling order of the processes using a Gantt chart. b. What is the turnaround time for each process? c. What is the waiting time for each process? d. What is the CPU utilization rate?
Given the list of processes, their CPU burst times, arrival times and priorities implement SJF,Priority and Round Robin scheduling algorithms on the processes with preemption. For each ofthe scheduling policies, compute and print the completion Time(CT), Turnaround Time(TAT),and Waiting Time(WT) for each process using C Programming.Waiting time: Processes need to wait in the process queue before execution starts and inexecution while they get preempted. Turnaround time: Time elapsed by each process to get completely served. (Difference betweensubmission time and completion time).
Stride scheduling is in Section 9.6. Please read that section. Consider the following mix of jobs running on a system using stride scheduling: Job # 1 2 3 Stride 40 60 30 If we wish to add a job #4 that will run twice as often as job #1, what is an appropriate stride for the job?
3. Job Scheduling: Consider the problem of scheduling n jobs of known durations t1, t2, ..., tn, for execution by a single processor. The jobs can be executed in any order, one job at a time. You want to find a schedule that minimizes the total time spent by all the jobs in the system. (The time spent by one job in the system is the sum of the time spent by this job in waiting plus the time spent on its execution.) Design a greedy algorithm for this problem. Does the greedy algorithm always yield an optimal solution?
Apply the following CPU scheduling algorithms and be able to compare the output based on the following parameters identified below. CPU scheduling algorithms: 1 First-Come First-Serve Scheduling, FCFS. 2 Shortest-Job-First Scheduling, SJF. 3 Priority Scheduling. 4 Round Robin Scheduling. ... Job Arrival Time Burst Time Priority J1 0 5 1 J2 1 3 2 J3 2 2 3 J4 3 6 4 J5 4 4 5 Use this parameters with each CPU scheduling: CPU utilization Throughput Turn-around time of each job Turn-around time Average Waiting time of each job Waiting time Average Response time Answer and explain the following questions: What scheduling system is the best performer? Define your parameters or attributes or basis in selecting the best performer CPU Scheduling system. What scheduling system needs enhancement/improvement. Explain the needed improvements based on your parameters/attributes/basis. What additional parameters or attributes…
Implement the following scheduling algorithms in C First-come, first-served (FCFS), which schedules tasks in the order in which they request the CPU. Shortest-job-first (SJF), which schedules tasks in order of the length of the tasks' next CPU burst. Priority scheduling, which schedules tasks based on priority. Round-robin (RR) scheduling, where each task is run for a time quantum (or for the remainder of its CPU burst). This is pre-emptive by default Priorities range from 1 to 10, where a higher numeric value indicates a higher relative priority. For round-robin scheduling, the length of a time quantum is 10 milliseconds. It never changes from this value.
Calculate the average waiting time using the following scheduling algorithms.i. Shortest-Job-First (SJF)ii. Non-preemptive priority (a smaller priority number implies a higher priority, so priority = 1 will be first)iii. Round-Robin (RR) with Time quantum = 4
Differentiate between Preemptive and Non-Preemptive Scheduling. Apply MLQ scheduling for following set of processes of two queues Q1 and Q2 where Priority of Q1 is greater than that of Q2 and Q1 uses Round Robin (Time Quantum = 2) and Q2 uses FCFS. AT BT Queue Number 0 5 1 2 12 2 5 3 1 10 6 1 Construct Gantt Chart and compute average TAT for above scenario. Process P1 P2 P3 P4