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1

IISc CSA Written Test 2019
Given that a computer system has only 3 process.1st process is single threaded, 2nd process is two threaded and 3rd process is 4 threaded.So total how many number of page tables will be managed by the operating system?

asked Jun 4 in Operating System by Sourajit25 Junior (953 points) | 36 views

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2

Self Doubt:Operating System-Threads
User level threads doesnot require context switching- This is a true statement (Because OS cannot recognize user level threads) Can somebody elaborate more on it?? This given answer is wrong I think:https://gateoverflow.in/290648/made_easy_test_series Plz check

asked May 19 in Operating System by srestha Veteran (111k points) | 34 views

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3

Galvin Edition 9 Exercise 9 Question 36 (Page No. 456)
A system provides support for user-level and kernel-level threads. The mapping in this system is one to one (there is a corresponding kernel thread for each user thread). Does a multithreaded process consist of $(a)$ a working set for the entire process or $(b)$ a working set for each thread ? Explain

asked Mar 22 in Operating System by akash.dinkar12 Boss (40.4k points) | 36 views

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4

Galvin Edition 9 Exercise 4 Question 15 (Page No. 193)
Consider the following code segment: pid t pid; pid = fork(); if (pid == 0) { /* child process */ fork(); thread create( . . .); } fork(); a. How many unique processes are created? b. How many unique threads are created?

asked Mar 19 in Operating System by akash.dinkar12 Boss (40.4k points) | 17 views

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5

Galvin Edition 9 Exercise 4 Question 14 (Page No. 192-193)
A system with two dual-core processors has four processors available for scheduling. A CPU-intensive application is running on this system. All input is performed at program start-up, when a single file must be opened. Similarly, ... ? Explain. How many threads will you create for the CPU-intensive portion of the application ? Explain.

asked Mar 19 in Operating System by akash.dinkar12 Boss (40.4k points) | 12 views

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6

Galvin Edition 9 Exercise 4 Question 12 (Page No. 192)
Using Amdahl’s Law, calculate the speedup gain of an application that has a 60 percent parallel component for (a) two processing cores and (b) four processing cores.

asked Mar 19 in Operating System by akash.dinkar12 Boss (40.4k points) | 28 views

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7

Galvin Edition 9 Exercise 4 Question 11 (Page No. 192)
Is it possible to have concurrency but not parallelism ? Explain.

asked Mar 19 in Operating System by akash.dinkar12 Boss (40.4k points) | 21 views

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8

Galvin Edition 9 Exercise 4 Question 9 (Page No. 192)
Can a multithreaded solution using multiple user-level threads achieve better performance on a multiprocessor system than on a single processor system ? Explain.

asked Mar 19 in Operating System by akash.dinkar12 Boss (40.4k points) | 6 views

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9

Galvin Edition 9 Exercise 4 Question 8 (Page No. 192)
Which of the following components of program state are shared across threads in a multithreaded process ? a. Register values b. Heap memory c. Global variables d. Stack memory

asked Mar 19 in Operating System by akash.dinkar12 Boss (40.4k points) | 8 views

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10

Galvin Edition 9 Exercise 4 Question 7 (Page No. 192)
Under what circumstances does a multithreaded solution using multiple kernel threads provide better performance than a single-threaded solution on a single-processor system ?

asked Mar 19 in Operating System by akash.dinkar12 Boss (40.4k points) | 7 views

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11

Galvin Edition 9 Exercise 4 Question 6 (Page No. 192)
Provide two programming examples in which multithreading does not provide better performance than a single-threaded solution.

asked Mar 19 in Operating System by akash.dinkar12 Boss (40.4k points) | 8 views

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12

Galvin Edition 9 Exercise 4 Question 5 (Page No. 192)
Assume that an operating system maps user-level threads to the kernel using the many-to-many model and that the mapping is done through LWPs(Light Weight Processes). Furthermore, the system allows developers to create real-time threads for ... real-time systems. Is it necessary to bind a real-time thread to an LWP(Light Weight Process) ?Explain.

asked Mar 19 in Operating System by akash.dinkar12 Boss (40.4k points) | 7 views

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13

Galvin Edition 9 Exercise 4 Question 4 (Page No. 191)
What resources are used when a thread is created ? How do they differ from those used when a process is created ?

asked Mar 19 in Operating System by akash.dinkar12 Boss (40.4k points) | 4 views

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14

Galvin Edition 9 Exercise 4 Question 3 (Page No. 191)
Describe the actions taken by a kernel to context-switch between kernel level threads.

asked Mar 19 in Operating System by akash.dinkar12 Boss (40.4k points) | 4 views

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15

Galvin Edition 9 Exercise 4 Question 2 (Page No. 191)
What are two differences between user-level threads and kernel-level threads ? Under what circumstances is one type better than the other ?

asked Mar 19 in Operating System by akash.dinkar12 Boss (40.4k points) | 3 views

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16

Galvin Edition 9 Exercise 4 Question 1 (Page No. 191)
Provide two programming examples in which multithreading provides better performance than a single-threaded solution.

asked Mar 19 in Operating System by akash.dinkar12 Boss (40.4k points) | 8 views

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17

MadeEasy Subject Test 2019: Operating System - Threads

asked Jan 23 in Operating System by Anurag Parothia 1 (499 points) | 58 views

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1 answer

18

GATEBOOK-2019 Mock Test1-17
Which of the following statements is FALSE? Each thread has its own stack Starvation implies deadlock Smaller page size increases the page table size User level process can not modify its own page table entries

asked Jan 19 in Operating System by GATEBOOK Boss (11.4k points) | 105 views

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19

Process vs Threads
Identify Correct Statements : A. Forked Process shares the address space and other resources with parent. B. Forked Process can't use multiprocessor for parallel execution. C. Security is better in Process in comparison to threads. D. Thread switching doesn't require Kernel Support unlike threads. Explain Everyone of them (Mulitiple choices can be present)

asked Jan 8 in Operating System by Na462 Loyal (6.6k points) | 135 views

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1 answer

20

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?

asked Jan 7 in Operating System by Shivam Kasat Active (3k points) | 149 views

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21

Operating System
Why context switching between kernel level threads has high overhead? as compare to user level threads

asked Jan 3 in Operating System by Swapnil Naik Active (3k points) | 29 views

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1 answer

22

MadeEasy Full Length Test 2019: Operating System - Threads
Consider the following statements: S1 : Multiprogramming is used to increase CPU utilization, while time-sharing is used to increase CPU responsiveness in interacting with user. S2 : If a user-level thread is blocked for I/ ... to be assigned to different processors in a multi-processor computer system. Which of the following is true?

asked Dec 28, 2018 in Operating System by balraj_allam (89 points) | 155 views

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23

Zeal Test Series 2019: Operating System - Threads
The primary difference between process and thread? The number of I/O requests mode. The amount of overhead associated with creation and context switching The amount of memory allocation The average number of instructions executed

asked Dec 12, 2018 in Operating System by Prince Sindhiya Loyal (5.4k points) | 41 views

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24

MadeEasy Test Series: Operating System - Threads
Consider the following statements: S1: Multiprogramming is used to increase CPU utilization, while time-sharing is used to increase CPU responsiveness in interacting with user. S2: If a user-level-thread is blocked for I/O operation, then kernel of OS will ... of the following is true? Only S1 & S2 Only S2 & S3 Only S1 & S3 None of these

asked Dec 9, 2018 in Operating System by balraj_allam (89 points) | 91 views

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25

Threads
Which of the following is not a reason to create threads? A)To achieve true CPU concurrency B)Creating a new process is costly C)Communication between processes must go through operating system D)The process as a whole gets one time slice irrespective of the no of threads it has

asked Dec 7, 2018 in Operating System by minal Boss (16.9k points) | 72 views

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26

Threads
Consider following statements given below : S1 : User level thread does not require context switching. S2 : VM increases context switching overhead. Which of the following statements are TRUE ?

asked Dec 4, 2018 in Operating System by Na462 Loyal (6.6k points) | 102 views

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27

Interprocess Communication
Consider the following statements: S1 : Interprocess communication and sharing is easier in process rather than threads. S2 : There is no protection between threads of same process. Which of the following statements are Valid ?

asked Dec 2, 2018 in Operating System by Na462 Loyal (6.6k points) | 135 views

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28

Threads
Consider the following statements: S1 : Multiprogramming is used to increase CPU utilization, while time-sharing is used to increase CPU responsiveness in interacting with user. S2 : If a user-level thread is blocked for I/O operation, then kernel of ... several userlevel threads to be assigned to different processors in a multi-processor computer system. Which of the following is true?

asked Nov 26, 2018 in Operating System by Shivangi Parashar 2 (257 points) | 106 views

+1 vote

2 answers

29

Kernal level vs User level thread
Consider two processes X having P threads and Y having Q threads with equal time slices respectively.Threads are mixed with user level threads (ULT) and kernel level threads (KLT) with P > Q. Now consider the following statements I) If all threads are user level threads ... . III only 2. II and III only 3. I and II only 4.I, II and III How statement-1 Is true??

asked Nov 10, 2018 in Operating System by Sandy Sharma Active (1.2k points) | 104 views

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1 answer

30

threads
There is no protection between the threads of same process why ?

asked Nov 8, 2018 in Operating System by Gurdeep Saini Loyal (9.4k points) | 122 views

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