Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: Thrashing occurs when a process spends more time on paging than executing. Reason R: It happens when the degree of multiprogramming is too low and frames are insufficient. In the light of the above statements, choose the most appropriate answer from the options given below
Assertion A Analysis: Thrashing Definition
Assertion A states that thrashing occurs when a process spends more time on paging than executing. This is the standard definition of thrashing in operating systems. Excessive paging activity leads to a decrease in useful work done by the process.
Therefore, Assertion A is correct.
Reason R Analysis: Causes of Thrashing
Reason R claims thrashing happens when the degree of multiprogramming is too low and frames are insufficient.
Thrashing occurs due to a high degree of multiprogramming, not a low one. When too many processes compete for limited physical memory (frames), each process may not have enough frames to hold its working set. This leads to frequent page faults and excessive paging activity, which is thrashing. An insufficient number of frames is a contributing factor, but it usually exacerbates the problem when the system is already trying to run too many processes (high multiprogramming degree).
Therefore, Reason R is incorrect.
Conclusion: Choosing the Correct Option
Based on the analysis:
- Assertion A is correct.
- Reason R is incorrect.
This corresponds to the option stating that A is correct, but R is not correct.
Important Questions from Virtual Memory
Which of the following cloud concept/s is/are related to pooling and sharing of resources?
(A) Virtual Memory
(B) Service
(C) Virtualization
Choose the correct answer from the options given below:
The time required to wait until Read/Write head comes under a desired sector is known as ______
Size of virtual memory depends on
If two non-continuous free partition of size ‘a’ and ‘b’ are available. A process of size ‘c’ cannot be allocated even when a + b > c, a < c and b < c. This problem is known as _______.
- Arrange the process of virtualization in cloud environments.
A. Hypervisor installed on physical server
B. Virtual machines created
C. Resources allocated to Virtual machines
D. Virtual machines run isolated workloads
Choose the correct answer from the options given below:
