Urgent solve it please A single processor system has to execute sixjobs L, M, N, O, P and Q having priorities 4,7(high), 6, 6, 1(low) and 3 with arrival time(AT) at5, 4, 3, 1, 2 and 6 units respectively. Their bursttime(BT) requirements are 5, 6, 7, 9, 2 and 3units respectively. If two process comes at sametime in a queue then order is followed i.e, L hasthe highest priority and P has the lowest priority.Let the average waiting time by using RoundRobin scheduling with time slice of 3-time unit is"x" unit and using Priority based (Non pre-emptive) scheduling is "y" unit. Then find thevalue of y - x. (Answer up to 2 decimal place)?

A single processor system has to execute six jobs L, M, N, O, P and Q having priorities 4, 7(high), 6, 6, 1(low) and 3 with arrival time(AT) at 5, 4, 3, 1, 2 and 6 units respectively. Their burst time(BT) requirements are 5, 6, 7, 9, 2 and 3 units respectively. If two process comes at same

A single processor system has to execute six jobs L, M, N, O, P and Q having priorities 4, 7(high), 6, 6, 1(low) and 3 with arrival time(AT) at 5, 4, 3, 1, 2 and 6 units respectively. Their burst time(BT) requirements are 5, 6, 7, 9, 2 and 3 units respectively. If two process comes at same

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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Suppose there are four processes (P1 - P4) with respective arrival times of 0, 10, 30, and 40, and burst times of 30, 20, 50, and 20 ms. These processes are scheduled from a ready queue on first come first served. The average waiting time is?
Problem: A single process, with execution time of BT time units, is detected by the system that uses Round Robin algorithm with time quantum of QT time units. Every time the time quantum elapses; a context switch is always performed with CS time units. Assume that the process come at time equal to zero (0). 1) If BT is 25, QT is 10 and CS is 2, what is the CPU utilization of the system? a. Below 70% b. 70-79% c. 90- 100% d. 80-89% 2) If BT is 20, QT is 6 and CS is 1, what is the CPU utilization of the system? a. 95- 100% b. 90- 94% c. Below 85% d. 85-89% 3) What is the CPU utilization if BT is equal QT and QT is equal to CS? a. 100% b. 50% c. 75% d. 60% 4) What is the system’s throughput if BT is less than QT? a. 3/BT b. Undetermined c. 1/BT d. 2/BT 5) What is the system’s turnaround time (TAT) if BT is less than QT? a. BT/QT b. BT c. CS d. QT
Consider the FCFS, SJF, and RR (quantum = 8 milliseconds) scheduling algorithms for this set of processes. Process Burst Time P1 8 P2 25 P3 3 P4 7 P5 11 The processes are assumed to have arrived in the order P1, P2, P3, P4, P5, all at time 0. a) Draw Gantt charts that illustrate the execution of these processes using the following scheduling algorithms: FCFS, SJF, and RR. b) What is the waiting time of each process for each of these scheduling algorithms? c) Which of the algorithms results in the minimum average waiting time (overall processes)? d) Derive the Need (max-Alloc) matrix. It should be presented like the Allocation or Maximum matrices above. e) If the request from process P1 arrives for (0,1,2,0), can the request be granted? Why?
Four processes arrive at the same time with their priorities, execution times and I/O times given in the table below. Assuming a Round-Robin Scheduling works with a quantum time of 3, but the scheduler selects the process with highest priority from the queue (NOT those arrived earliest), other than currently pre-empted process, at each turn; a-)Draw the timeline for CPU- and I/O- bursts for these processes b-)Calculate average turn-around time
Real-time scheduling: In a system consisting of two processes, P1 and P2, suppose process P1 has a period p1 of 50, an execution time t1 of 25, and a deadline that matches its period (50). Further, suppose that P2 has a period p2 of 75, an execution time t2 of 30, and a deadline that matches its period (75). Is this real-time system schedulable under rate-monotonic scheduling? Explain your answer using the concept of overall CPU utilization and schedulability.
a single process, with execution time of BT time units, is detected by the system that uses Round Robin algorithm with time quantum of QT time units. Every time the time quantum elapses; a contect switch is always performed with CS time units. Assume that the process come at time equal to zero(0) If BT is 25, QT is 10 and CS is 2, what is the Cpu utilization of the system? If BT is 20, QT is 6 and CS is 1 what is the CPU utilization of the system? What is the CPU utilization if BT is equal QT and QT is equal to CS? What is the system's throughput if BT is less than QT? What is the system's turnaround time (TAT) if BT is less than QT?
Draw a Gantt chart to illustrate the execution of P1, P2, P3, P4 and P5 using MultilevelFeedback Queue in single core computing system (Quantum = 8) with the following arrivaltime and burst requirements in the table below.
In the working set model, the idea is to examine the most recent delta page referances. It is also known as an approximation of the Program's Locality. If the total demand is greater than the total number of available frames (D>m) then it will cause thrashing, because in this case, some processes will not have enough frames. Below you see 3 processes and their excepted memory references during their execution. When will the thrashing happen to occur according to the working set model? Assume total memory(m) is 10 and Delta is 5
In your opinion what does the term semaphore mean in terms of managing concurrent processes in operating systems. a) consider the case of a non negative counting semaphore S. During an execution, 18P(S) operations and 13 V (S) operations were carried out in some order. What is the largest initial value of S for which at least two P(S) operations are blocked?
Transcribed Image Text Consider the following set of processes, with arrival times and the length of the CPU burst time given in milliseconds. a. Draw a Gantt chart that illustrates the execution of these processes using the Shortest-Remaining Time First (SRTF) scheduling algorithm. b. Give the average waiting time of Shortest-Remaining Time First (SRTF) scheduling algorithm. Note: Preempted processes are added to the end of the ready queue. Process Arrival Time Burst Time A 4 B 1 3 1 D 3 4 3
In this exercise, we consider the execution of a loop in a statically scheduled superscalar processor that has full forwarding. Loop: lw $t3, 0($s1) lw $t4, 0($s2) mul $t1, $t3, $t4 add $s0, $t1, $s0 addi $s1, $s1, -8 addi $s2, $s2, -8 bne $s1, $zero, Loop Unroll this loop so that three iterations of it are done at once and schedule it for a 2-issue pipelined processor. This processor can issue one ALU/branch instruction and one lw/sw instruction each cycle. Assume that the loop always executes a number of iterations that is a multiple of 3. You can use any unused registers when changing the code to eliminate dependencies.
In the picture attached, the Say that the system is running 3 jobs, A, B, and C, and that all of them are CPU-intensive (i.e., each one does one infinitely long CPU burst). The system begins with A on the CPU at the beginning its time quantum while B and C are in the Ready Queue, in that order. a) Show the execution pattern (as a string of A’s, B’s, C’, and o’s) assuming that the scheduler time quantum is equal to 4 ms. Show the execution for more than 20ms (but less than 30ms). b) In the long run (i.e, assuming jobs don’t ever terminate), what percentage of the CPU time is wasted doing context-switching/scheduling? The answers I came up with is as follows: a) AAAAoBBBoCCCoAAAoBBBoCCCoAAA, because for the first 4ms, A gets to execute it's full time quantum, however, when context-switching to the next job, the switch is included in the time quantum. b) 2.77% spent context switching, divide the number of o's by the total amount of runtime.