What are scheduling algorithms in OS?
Round Robin is the preemptive process scheduling algorithm. Each process is provided a fix time to execute, it is called a quantum. Once a process is executed for a given time period, it is preempted and other process executes for a given time period. Context switching is used to save states of preempted processes.
Which scheduling algorithm gives a minimum average waiting time?
SJF
Which of the following scheduling algorithm may cause starvation?
As the Shortest remaining time first scheduling is a preemptive version of shortest job scheduling. It may cause starvation as shorter processes may keep coming and a long CPU burst process never gets CPU.
Can shortest remaining time first scheduling may cause starvation?
Explanation: I) Shortest remaining time first scheduling is a pre-emptive version of shortest job scheduling. In SRTF, job with the shortest CPU burst will be scheduled first. Because of this process, It may cause starvation as shorter processes may keep coming and a long CPU burst process never gets CPU.
Which of the following is preemptive algorithm?
Preemptive scheduling is used when a process switches from running state to ready state or from waiting state to ready state. Algorithms based on preemptive scheduling are: Round Robin (RR),Shortest Remaining Time First (SRTF), Priority (preemptive version), etc. 2.
What is the main function of the command interpreter?
A command interpreter allows the user to interact with a program using commands in the form of text lines. It was frequently used until the 1970’s. However, in modern times many command interpreters are replaced by graphical user interfaces and menu-driven interfaces.
What is FCFS algorithm?
First Come First Serve (FCFS) is an operating system scheduling algorithm that automatically executes queued requests and processes in order of their arrival. It is the easiest and simplest CPU scheduling algorithm. This is managed with a FIFO queue.
Which is the best page replacement algorithm?
Chosse a best algorithm for page replacement to reduce page fault and analysis their with c# 4. In the above fig-01 with 5 page frames, the number of page faults is 15. The advantage of FIFO page replacement algorithm is easy to implement and disadvantage is that it suffers from Belady’s anomaly.
How do you solve FIFO page replacement algorithm?
First In First Out (FIFO) – This is the simplest page replacement algorithm. In this algorithm, the operating system keeps track of all pages in the memory in a queue, the oldest page is in the front of the queue. When a page needs to be replaced page in the front of the queue is selected for removal.
Which of the following is the main drawback of FIFO page replacement algorithm?
6. Which of the following is the main drawback of FIFO page replacement algorithm? Explanation: The main drawback of FIFO page replacement algorithm is that it reduces the level of multiprogramming and also causes Belady’s anomaly.
What is the basic approach of page replacement?
What is the basic approach of page replacement? If no frame is free is available, find one that is not currently being used and free it. A frame can be freed by writing its contents to swap space, and changing the page table to indicate that the page is no longer in memory.
Which algorithm has lowest page fault rate?
Optimal page replacement algorithm
How does LRU algorithm work?
A good approximation to the optimal algorithm is based on the observation that pages that have been heavily used in the last few instructions will probably be heavily used again in the next few. This strategy is called LRU (Least Recently Used) paging. …
Which of the following is page replacement algorithm?
Optimal Page Replacement algorithm is the best page replacement algorithm as it gives the least number of page faults. It is also known as OPT, clairvoyant replacement algorithm, or Belady’s optimal page replacement policy.
Which of the following is the set of page replacement algorithm?
LRU page replacement algorithm is used. B. FIFO page replacement algorithm is used.