**Problem Statement:**Four processes—\( P_1, P_2, P_3, \) and \( P_4 \)—are scheduled to use a single processor. The table below shows the arrival time and duration of each of the four processes.| Process | Arrival Time (seconds) | Duration (seconds) ||---------|------------------------|--------------------|| \( P_1 \) | 0 | 7 || \( P_2 \) | 2 | 4 || \( P_3 \) | 4 | 1 || \( P_4 \) | 5 | 4 |**Question:**If the system uses a preemptive shortest-job-first scheduling algorithm, what is the average waiting time for the four processes, in seconds?

Here in this question we have given four processes with thier arrival time and duration and we have…

Answered: 13. Four processes-R, P,, P, and P,-are…

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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rocess Arrival Time CPU Burst Time Priority PI P2 P3 P4 5 0 7 4 6 7 5 7 HIGH LOW VERY HIGH MEDIUM (a) Draw a Gantt chart of the process scheduling using preemptive, priority-based scheduling. Determine the waiting time & the turnaround time of individual processes and the average waiting time & the average turnaround time. In case of a tie, use arrival times to break the tie
a) Find out the average waiting time, average response time and average turnaround time of the following processes using a. Shortest Remaining Time First Scheduling b. Preemptive Priority Scheduling Process Arrival Time Priority Execution Time P1 2 7 P2 1 4 P3 1 1 3 P4 3 2
Part I Assume that the ready queue has just received for processes: P1, P2, P3, P4, in that order. All at time 0. The CPU execution times for these processes are as follows: Process Execution Time P1 P2 P3 P4 13 8 15 6 Draw the Gantt chart and calculate the metric listed in parentheses for each of the following scheduling algorithms: 1. First Come, First Served (Total Wait Time) 2. Shortest Job First (Total Wait Time) 3. Round Robin, with a time quantum of 5 ms (Total Wait and Response Times) Part II Now assume that P1 arrives in the ready queue at time 0, P2 arrives at time 4, P3 arrives at time 10, and P4 arrives at time 20. The CPU execution times for the processes are the same as in Part I: Process Execution Time P1 P2 P3 P4 P1 13 P2 8 P3 15 P4 6 Draw the Gantt chart and calculate the total wait time for each of the following scheduling algorithms: 1. Shortest Job First 2. Shortest Remaining Time Next (remember, this is a preemptive algorithm) 3. Preemptive priority with the…
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
Question 20 Please fill in the blank correctly.
Q)Two processes P1, and P2 arrive at time=0 in order and have Process(execution time) as follows. P1(4), P2(2). Find the average waiting time for these processes if they are scheduled as Round Robin with time quanta of 1 unit. a)2 b)1 c)3 d)4 Q)Three processes P1, P2 and P3 arrive at time=0 in order and have Process(execution time) as follows. P1(10), P2(4), P3(7). Find the average response time for these processes if they are scheduled as Shortest Job First. a)12 b)3.3 c)5 d)4 Q)A process has executed 3 ms in its last burst and our estimate of its last burst was 6 ms. Find our estimate for its next burst with a)4 ms b)4.5 ms c)3.5 ms d)5 ms
1. Consider the following task set scheduled according to the rate monotonic assignment and answer the questions accordingly. T1-(1, 0.5), T2= (1.5, 0.4) (a) Is the schedule feasible? (b) Do these tasks fully utilize the processor (based on RM scheduling)? Show your answer. (c) (if the answer to (b) is “no",) Change the run time of the first task so that the resulting set will maximize the utilization of the processor under RM scheduling. (d) What is the maximum achievable utilization if the period for the second task was changed from 1.5 to 2 (and the run times could also be modified to achieve maximum utilization)?
An operating system uses the Banker's algorithm for deadlock avoidance when managing the allocation of three resource types X, Ý, and Z to three processes PO, P1, and P2. The table given below presents the current system state. There are 3 instances of type X, 2 instances of type Y and 2 instances of type Z still available. The system is currently in a safe state. Answer the following questions! Allocation Max X Y z X Y PO 0 1 8 4 3 (a) If PO requests 2 instances of Z during the P1 3 2 current state, can it be granted? Explain! (b) If P1 requests 2 instances of X during the P2 2 1 1 3 3 3 current state, can it be granted? Explain! CO
Consider the following processes:Process Arrival Time Service Time A 0 3 B 1 1 C 3 3 D 4 2 E 5 5 Show how the above processes execute over time on a single CPU system (i.e., please drawthe schedule where the x-axis is the time). Compute the completion time for each process,and the average turnaround time for all processes under each of the following schedulers:(a) FCFS. (b) Round Robin with (q = 1). (c) Shortest Job First. (d) Shortest Remaining Time First. (e) HRRN.
Let the processes P1, P2, P3, P4, and P5 be given. They arrive in the system at the same time in this order. The processes have the attached service times (in time units) and priorities. For each of the scheduling methods (First Come, first served (FIFO), Shortest Job First, Round Robin, and Priority Scheduling), specify the execution order of the processes and the average execution time (average turnaround time) for all processes. First, determine and state the execution times of the individual processes and then calculate the average value. Note: • For Shortest Job First, If the required service time (CPU time) is the same for two or more processes, use First Come, first served to resolve the conflict. • For Round Robin, the time quantum q = one time unit. • For Priority Scheduling, low integer priority values signify high priorities, with O being the highest possible priority. If multiple processes have the same priority, use First Come, first served to resolve the conflict. Also,…
Q3: Suppose there are 4 processors that arrived in an order below, you are using Shortest Job First Scheduling (Preemptive), you are asked to draw a Gantt chart and also find the average waiting time Process Name Arrival Time Burst Time Processor 1 13 Processor 2 18 Processor 3 25 Processor 4 9. 4 Processor 10 31
1. Explain the Round-Robin Scheduling algorithm with examples.

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