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Recent questions tagged process-scheduling
4
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1
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91
NIELIT 2017 July Scientist B (IT) - Section B: 45
Consider three processes, all arriving at time zero, with total execution time of $10,20$ and $30$ units, respectively. Each process spends the first $20\%$ of execution time doing I/O, the next $70\%$ of time doing computation, and the last $10\%$ ... possible. For what percentage of time does the CPU remain idle? $0\%$ $10.6\%$ $30.0\%$ $89.4\%$
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Mar 30, 2020
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admin
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nielit2017july-scientistb-it
operating-system
process-scheduling
2
votes
1
answer
92
NIELIT 2017 July Scientist B (IT) - Section B: 46
Consider three CPU-intensive processes, which require $10,20$ and $30$ time units and arrive at times $0,2$ and $6$, respectively. How many context switches are needed if the operating system implements a shortest remaining time first scheduling algorithm? Do not count the context switches at time zero and at the end. $1$ $2$ $3$ $4$
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Operating System
Mar 30, 2020
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nielit2017july-scientistb-it
operating-system
process-scheduling
1
vote
1
answer
93
NIELIT 2017 July Scientist B (IT) - Section B: 47
Which of the following process scheduling algorithm may lead to starvation? FIFO Round Robin Shortest Job Next None of the option
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Operating System
Mar 30, 2020
by
admin
1.4k
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nielit2017july-scientistb-it
operating-system
process-scheduling
0
votes
2
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94
NIELIT 2017 July Scientist B (IT) - Section B: 48
A scheduling algorithm assigns priority proportional to the waiting time of a process. Every process starts with priority zero (the lowest priority). The scheduler re-evaluates the process priorities every $T$ time units and ... to the shortest-job-first algorithm. This algorithm is equivalent to the shortest-remaining time-first algorithm.
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Operating System
Mar 30, 2020
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admin
1.2k
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nielit2017july-scientistb-it
operating-system
process-scheduling
0
votes
4
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95
NIELIT 2017 DEC Scientist B - Section B: 12
Consider the following four processes with their corresponding arrival time and burst time: ... turn around time (in ms) for these processes using FCFS scheduling algorithm? $15$ $12.8$ $13$ none of the options
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Operating System
Mar 30, 2020
by
admin
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nielit2017dec-scientistb
operating-system
process-scheduling
0
votes
2
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96
UGC NET CSE | December 2006 | Part 2 | Question: 37
____________ is one of pre-emptive scheduling algorithm. Shortest-Job-first Round-robin Priority based Shortest-Job-next
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Operating System
Mar 27, 2020
by
go_editor
839
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ugcnetcse-dec2006-paper2
operating-system
process-scheduling
0
votes
1
answer
97
UGC NET CSE | December 2006 | Part 2 | Question: 38
A software to create a Job Queue is called ____________ . Linkage editor Interpreter Driver Spooler
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Operating System
Mar 27, 2020
by
go_editor
536
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ugcnetcse-dec2006-paper2
operating-system
process-scheduling
0
votes
1
answer
98
UGC NET CSE | June 2005 | Part 2 | Question: 39
Which is the correct definition of a valid process transition in an operating system ? Wake up : Ready $\rightarrow$ Running Dispatch: Ready $\rightarrow$ Running Block : Ready $\rightarrow$ Running Timer run out: Ready $\rightarrow$ Blocked
go_editor
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Operating System
Mar 26, 2020
by
go_editor
506
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ugcnetcse-june2005-paper2
operating-system
process-scheduling
0
votes
3
answers
99
UGC NET CSE | January 2017 | Part 3 | Question: 52
Some of the criteria for calculation of priority of a process are: Processor utilization by an individual process. Weight assigned to a user or group of users Processor utilization by a user or group of processes In fair scheduler, priority is calculated based on: only (i) and (ii) only (i) and (iii) (i) ,(ii) and (iii) only (ii) and (iii)
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Operating System
Mar 24, 2020
by
go_editor
1.2k
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ugcnetcse-jan2017-paper3
operating-system
process-scheduling
16
votes
6
answers
100
GATE CSE 2020 | Question: 12
Consider the following statements about process state transitions for a system using preemptive scheduling. A running process can move to ready state. A ready process can move to running state. A blocked process can move to running state. A blocked process can move to ready state. ... TRUE? I, II, and III only II and III only I, II, and IV only I, II, III and IV only
Arjun
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Operating System
Feb 12, 2020
by
Arjun
12.7k
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gatecse-2020
operating-system
process-scheduling
1-mark
easy
14
votes
3
answers
101
GATE CSE 2020 | Question: 50
Consider the following set of processes, assumed to have arrived at time $0$. Consider the CPU scheduling algorithms Shortest Job First (SJF) and Round Robin (RR). For RR, assume that the processes are scheduled in the order$P_1, P_2, P_3, P_4$ ... of the difference between the average turnaround times (in ms) of SJF and RR (round off to $2$ decimal places is_______
Arjun
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Operating System
Feb 12, 2020
by
Arjun
10.3k
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gatecse-2020
numerical-answers
operating-system
process-scheduling
2-marks
3
votes
3
answers
102
TIFR CSE 2020 | Part B | Question: 8
Jobs keep arriving at a processor. A job can have an associated time length as well as a priority tag. New jobs may arrive while some earlier jobs are running. Some jobs may keep running indefinitely. A $\textsf{starvation free}$ ... job-scheduling policies is starvation free? Round - robin Shortest job first Priority queuing Latest job first None of the others
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Operating System
Feb 10, 2020
by
admin
1.2k
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tifr2020
operating-system
process-scheduling
round-robin-scheduling
4
votes
2
answers
103
ISRO2020-31
Three CPU-bound tasks, with execution times of $15,12$ and $5$ time units respectively arrive at times $0,t$ and $8$, respectively. If the operating system implements a shortest remaining time first scheduling algorithm, what should be the value of $t$ to have $4$ context switches? Ignore the context switches at time $0$ and at the end. $0<t<3$ $t=0$ $t<=3$ $3<t<8$
Satbir
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in
Operating System
Jan 13, 2020
by
Satbir
4.1k
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isro-2020
operating-system
process-scheduling
normal
2
votes
1
answer
104
ISRO2020-27
Which of the following algorithms defines time quantum? shortest job scheduling algorithm round robin scheduling algorithm priority scheduling algorithm multilevel queue scheduling algorithm
Satbir
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Operating System
Jan 13, 2020
by
Satbir
5.9k
views
isro-2020
operating-system
process-scheduling
easy
0
votes
0
answers
105
Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 63 (Page No. 179)
A process can be put into a round-robin queue more than once to give it a higher priority. Running multiple instances of a program each working on a different part of a data pool can have the same effect. First write a ... but on a system with other processes, you should be able to grab a bigger share of the CPU this way.
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in
Operating System
Oct 25, 2019
by
admin
328
views
tanenbaum
operating-system
process-and-threads
process-scheduling
descriptive
0
votes
0
answers
106
Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 53 (Page No. 178)
Consider a system in which it is desired to separate policy and mechanism for the scheduling of kernel threads. Propose a means of achieving this goal.
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in
Operating System
Oct 25, 2019
by
admin
575
views
tanenbaum
operating-system
process-and-threads
process-scheduling
threads
descriptive
0
votes
1
answer
107
Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 52 (Page No. 178)
A real-time system needs to handle two voice calls that each run every $6$ msec and consume $1$ msec of CPU time per burst, plus one video at $25$ frames/sec, with each frame requiring $20$ msec of CPU time. Is this system schedulable?
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Operating System
Oct 25, 2019
by
admin
1.3k
views
tanenbaum
operating-system
process-and-threads
process-scheduling
descriptive
1
vote
2
answers
108
Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 50 (Page No. 178)
A soft real-time system has four periodic events with periods of $50, 100, 200,$ and $250$ msec each. Suppose that the four events require $35, 20, 10,$ and $x$ msec of CPU time, respectively. What is the largest value of $x$ for which the system is schedulable?
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Operating System
Oct 25, 2019
by
admin
2.7k
views
tanenbaum
operating-system
process-and-threads
process-scheduling
descriptive
1
vote
1
answer
109
Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 49 (Page No. 178)
The aging algorithm with $a = 1/2$ is being used to predict run times. The previous four runs, from oldest to most recent, are $40, 20, 40,$ and $15$ msec. What is the prediction of the next time?
admin
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in
Operating System
Oct 25, 2019
by
admin
2.1k
views
tanenbaum
operating-system
process-and-threads
process-scheduling
descriptive
0
votes
0
answers
110
Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 48 (Page No. 178)
For the above problem, can another video stream be added and have the system still be schedulable?
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in
Operating System
Oct 25, 2019
by
admin
297
views
tanenbaum
operating-system
process-and-threads
process-scheduling
descriptive
0
votes
1
answer
111
Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 47 (Page No. 178)
Consider a real-time system with two voice calls of periodicity $5$ msec each with CPU time per call of $1$ msec, and one video stream of periodicity $33$ ms with CPU time per call of $11$ msec. Is this system schedulable?
admin
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Operating System
Oct 25, 2019
by
admin
1.3k
views
tanenbaum
operating-system
process-and-threads
process-scheduling
descriptive
1
vote
1
answer
112
Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 46 (Page No. 178)
A process running on $CTSS$ needs $30$ quanta to complete. How many times must it be swapped in, including the very first time (before it has run at all)?
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Operating System
Oct 25, 2019
by
admin
696
views
tanenbaum
operating-system
process-and-threads
process-scheduling
descriptive
0
votes
0
answers
113
Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 45 (Page No. 177 - 178)
Five batch jobs. $A$ through $E$, arrive at a computer center at almost the same time. They have estimated running times of $10, 6, 2, 4,$ and $8$ ... through $(d),$ assume that only one job at a time runs, until it finishes. All jobs are completely CPU bound.
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Operating System
Oct 25, 2019
by
admin
584
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tanenbaum
operating-system
process-and-threads
process-scheduling
descriptive
0
votes
1
answer
114
Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 44 (Page No. 177)
Five jobs are waiting to be run. Their expected run times are $9, 6, 3, 5,$ and $X$. In what order should they be run to minimize average response time? $($Your answer will depend on $X.)$
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in
Operating System
Oct 25, 2019
by
admin
2.8k
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tanenbaum
operating-system
process-and-threads
process-scheduling
descriptive
1
vote
1
answer
115
Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 43 (Page No. 177)
Measurements of a certain system have shown that the average process runs for a time $T$ before blocking on $I/O$. A process switch requires a time $S$, which is effectively wasted (overhead). For round-robin scheduling with quantum $Q$, give a formula ... $Q > T$ $S < Q < T $ $Q = S$ $Q\: \text{nearly}\: 0$
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Operating System
Oct 25, 2019
by
admin
1.9k
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tanenbaum
operating-system
process-and-threads
process-scheduling
round-robin-scheduling
descriptive
0
votes
1
answer
116
Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 42 (Page No. 177)
Explain how time quantum value and context switching time affect each other, in a round-robin scheduling algorithm.
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in
Operating System
Oct 25, 2019
by
admin
2.2k
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tanenbaum
operating-system
process-and-threads
context-switch
process-scheduling
round-robin-scheduling
descriptive
0
votes
3
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117
Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 40 (Page No. 177)
Round-robin schedulers normally maintain a list of all runnable processes, with each process occurring exactly once in the list. What would happen if a process occurred twice in the list? Can you think of any reason for allowing this?
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in
Operating System
Oct 25, 2019
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admin
1.4k
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tanenbaum
operating-system
process-and-threads
process-scheduling
descriptive
0
votes
0
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118
Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 26 (Page No. 175)
In Sec. $2.3.4$, a situation with a high-priority process, H, and a low-priority process, $L$, was described, which led to $H$ looping forever. Does the same problem occur if round-robin scheduling is used instead of priority scheduling? Discuss.
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in
Operating System
Oct 24, 2019
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admin
332
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tanenbaum
operating-system
process-and-threads
process-scheduling
descriptive
0
votes
0
answers
119
Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 24 (Page No. 175)
Does Peterson’s solution to the mutual-exclusion problem shown in Fig. $2-24$ work when process scheduling is preemptive? How about when it is nonpreemptive?
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Operating System
Oct 24, 2019
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admin
1.6k
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tanenbaum
operating-system
process-and-threads
process-scheduling
descriptive
5
votes
5
answers
120
UGC NET CSE | June 2019 | Part 2 | Question: 45
Consider three CPU intensive processes, which require $10$, $20$ and $30$ units of time and arrive at times $0$, $2$ and $6$ respectively. How many context switches are needed if the operating system implements a shortest remaining time first scheduling algorithm? Do not count the context switches at time zero and at the end. $4$ $2$ $3$ $1$
Arjun
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in
Operating System
Jul 2, 2019
by
Arjun
3.7k
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ugcnetcse-june2019-paper2
process-scheduling
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