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Recent questions tagged context-switch

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#Operating system question #cpu scheduling
Consider arrival time and execution time for the following process:- P.id A.T B.T 1 2 5 2 7 9 3 8 3 4 10 4 Assume, each context switch requires 1ms time (excluding first and last context switch).then solve it using SRTF(shortest remaining time first)

Syntax-error asked in Operating System Mar 13

by Syntax-error

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3 votes

1 answer

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Operating System | Round Robin | Preemption & Context Switch
Suppose only a process P1 is executing, using Round Robin scheduling. After the time slice expires, the same process comes back into execution. This could be considered as: (Time Slice of RR is smaller than burst of P1) Only preemption Only context switch Both preemption and context switch None

Souvik33 asked in Operating System Nov 26, 2022

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1 answer

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Made Easy Test Series 2021: Operating System
Consider the following segment: Note : Assume the count = count + 1; will execute in 3' different instructions. Where, m[count] refers to memory value of count variable. Preemption can occur while executing the above instructions. Each of the tally function has a separate ... 15 b) Min = 2, Maximum = 15 c) Min = 1, Maximum = 15 d) Min = 15, Maximum = 15

DebRC asked in Operating System Sep 13, 2022

by DebRC

476 views

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0 answers

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Operating System
1. Write clearly the dinning philosopher and reader-writer classical problem of process synchronization

kidussss asked in Operating System Sep 1, 2022

96 views

1 vote

1 answer

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Made easy || Operating system
Consider a process P running on a system with non-preemptive Kernel design. Consider following actions by P : (i) A blocking system call. (ii) Servicing a timer interrupt. (iii) Exit system call. (iv) Servicing a disk interrupt, that results in another blocked process being marked as ready. Which of the above actions always result in context-switch of P?

Shreya2002 asked in Operating System Aug 5, 2022

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1 answer

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Operating System | Process Scheduling | Round Robin
Lets consider one situation where, OS is scheduling processes(P1,P2,P3...Pn) with Round Robin method and current running process is P1 and next scheduled process in queue is also P1 (this case is possible in Round Robin). ... take place in Round Robin scheduling method with quantum=3unit for the given data below. AT=Arrival Time, BT=Burst Time

anupamsworld asked in Operating System Jun 7, 2022

by anupamsworld

596 views

1 vote

1 answer

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#Self Doubt OS CPU scheduling?
Does non preemptive CPU scheduling needs hardware support. kindly explain.

iarnav asked in Operating System Jan 12, 2022

by iarnav

215 views

1 vote

1 answer

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#self doubt #round robin #cpu scheduling
in round robin algorithm if a process with burst time = 10 arrived at t=0 and time quantum is 2 units, context switch time is 2 units . Then completion time of the process will be?

jayadev asked in Operating System Oct 10, 2021

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2 answers

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NIELIT 2017 DEC Scientist B - Section B: 17
The time taken to switch between user and kernel modes of execution be $t1$ while the time taken to switch between two processes be $t2$. Which of the following is TRUE? $t1>t2$ $t1=t2$ $t1<t2$ nothing can be said about the relation between $t1$ and $t2$

Lakshman Bhaiya asked in Operating System Mar 30, 2020

by Lakshman Bhaiya

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1 answer

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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.

Lakshman Bhaiya asked in Operating System Oct 25, 2019

by Lakshman Bhaiya

1.7k views

1 vote

3 answers

11

Self doubt
Virtual memory increases context switching overhead ? Why why not ?

kman30 asked in Operating System Jan 19, 2019

by kman30

567 views

1 vote

1 answer

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made_easy_test_series
Consider the following statements given below: S1: User-level threads switching does not require context switching. S2: Virtual memory increases the context switching overhead. S3: Every thread has its own registers and stack but not program counter. which of the ... I know: Context switching is faster in user level threads than kernel level threads, Then how come S1 is true?

Shivam Kasat asked in Operating System Jan 7, 2019

by Shivam Kasat

1.7k views

0 votes

1 answer

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GATE Overflow | Mock GATE | Test 1 | Question: 37
Consider the context switch of a CPU from the context of process $P1$ to that of process $P2$. Consider the following two events in the chronological order of the events during the context switch. (P) The Stack Pointer (SP) shifts ... via an atomic hardware instruction The relative ordering of $P$ and $Q$ varies from one context switch to the other

Ruturaj Mohanty asked in Operating System Dec 27, 2018

by Ruturaj Mohanty

824 views

0 votes

1 answer

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Zeal Test Series 2019: Operating System - Context Switch

Shukrayani asked in Operating System Dec 12, 2018

468 views

1 vote

1 answer

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Process Management
Q.Consider the processes P1, P2, P3, P4 whose arrival times are 0, 1, 2, 3 and Burst times are 5, 2, 13, 7. If the Context Switching time is 1 unit (ms), what is the average waiting time if Shortest Job Next scheduling algorithm is used? (a) 7.5 (b) 6.25 (c) 6.5 (d) None

abhishek1995_cse asked in Operating System Oct 5, 2018

by abhishek1995_cse

1.0k views

1 vote

0 answers

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Context Switching Process Management
What is the least number of context switching required for 'n' number of processes?

anisha007 asked in Operating System Sep 25, 2018

524 views

0 votes

0 answers

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My doubt on context switch and preemption
What is the difference between context switch and preemption? In case of critical section between context switch and preemption which one is possible ? And if so happens then how does it save the system from data inconsistency?

Akash Kumar Roy asked in Operating System Mar 30, 2018

by Akash Kumar Roy

1.3k views

8 votes

3 answers

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Self Doubt Context Switching Threads
S1: Context Switching occurs only in kernel mode. :TRUE S2: Context Switching in user mode is faster as compared to context switching in kernel mode. : TRUE If Context Switching occurs only in kernel mode, then how is CS in user mode faster ... switching and then change back to user mode which means more time should be taken as compared to CS in kernel mode.

_jerry asked in Operating System Jan 26, 2018

by _jerry

2.2k views

2 votes

0 answers

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CONTEXT SWITCH
Context switches can occur only in kernel mode. So for process switches first we have to move from user to kernel mode. Then we have to save the PCB of the process from which we are taking off CPU and then we have to load PCB of the required ... only for process switches, not for threads are the above-given statement and its explanation is true or not??if not please correct it!

learner_geek asked in Operating System Jan 2, 2018

by learner_geek

967 views

2 votes

1 answer

20

Context switch
Consider 4 processes sharing the CPU in round robin fashion. If context switch time is 1 sec , what must be the time quantum q such that the number of context switches are reduced , but at the same time each process is guaranteed to get the turn at the CPU for every 10 secs? ---------- ... ---------------------- Ans 2 or 1.5 . Is here any formula used like (n-1)q+ns explain in detail

srestha asked in Operating System Jan 2, 2018

1.7k views

0 votes

1 answer

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round robin scheduling
Choose correct answer from the below options: If the following jobs are to be executed on a single processor system The jobs are arrived at time 0 and in the order a, b, c, d, e. Calculate the departure time (completion time) for job ‘a’ if scheduling is round robin with time slice 1 15 5 9 11

Parshu gate asked in Operating System Dec 10, 2017

878 views

1 vote

2 answers

22

Paging ,os. Galvin book page no. 332
Paging increases context switch time how and why ???

royal shubham asked in Operating System Dec 6, 2017

by royal shubham

5.9k views

6 votes

1 answer

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CPU efficiency in round robin algorithm
Measurements of a certain system have shown that a process runs, on the average, for time T before blocking for Input/Output. Process switch requires time S which is overhead. For round robin scheduling with quantum Q, give a formula for the ... Can somebody please explain option c and hence option D with example ,Thanks and sorry if it is naive question :)

sunil sarode asked in Operating System Nov 15, 2017

by sunil sarode

9.6k views

2 votes

1 answer

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made easy practice booklet

charul asked in Operating System Nov 11, 2017

by charul

208 views

1 vote

2 answers

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MadeEasy Subject Test: Operating System - Process Schedule
I encountered 1 question on context switching in Made Easy test series where it is mentioned: Scheduling policy is preemptive priority. Context switch time is 1 unit. So while preempting one process and loading another should there be a 1-time unit gap or they can be done simultaneously in the gantt chart?

Tuhin Dutta asked in Operating System Oct 8, 2017

431 views

1 vote

1 answer

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Context Switch
Let P1 and P2 are two processes , the Context Switch happens from P1 to P2 . Meaning : Now what happens is CPU saves the state of P1 and loads the state of P2. Who raises interrupt to cause a Context Switch? But where CPU can find all these information ? Is it available in PCB or in Stack?

Anjan asked in Operating System Sep 26, 2017

by Anjan

230 views

8 votes

5 answers

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OS:- Round Robin scheduling
If we have only one process in ready queue with burst time "m", then how many context switching will happen using round robing scheduling with time quantum q ,where q<m.Assume that dispatching the process first time is not counted as a context switch.

rahul sharma 5 asked in Operating System Aug 26, 2017

by rahul sharma 5

3.7k views

4 votes

2 answers

28

Context switches in round robin
Here what are the number of context switches ? Is it 5 or 6? Do we consider context switch before P1 (i.e during the start) ?

Xylene asked in Operating System Aug 12, 2017

by Xylene

10.9k views

1 vote

3 answers

29

Context Switch Question
Out of the following actions by a process running on a system the actions (i) (fill ALL possible correct choices) will always result in a context switching out of the running process. (a) Servicing an interrupt. (b) A blocking system call. (c) A non-blocking system call. (d) The system call exit, to terminate the current process.

kauray asked in Operating System May 8, 2017

by kauray

4.6k views

1 vote

1 answer

30

Doubt OS - Round Robin- Context Switch
How many time context switch in Round Robin? ( if only one process remain in ready queue at end of scheduling does that count every time, when time slice over or only one time?)

sanyam53 asked in Operating System Jan 7, 2017

1.5k views

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Recent questions tagged context-switch