What are the criteria for scheduling?

Scheduling Criteria
  • CPU utilization. We want to keep the CPU as busy as possible. …
  • Throughput. If the CPU is busy executing processes, then work is being done. …
  • Turnaround time. …
  • Waiting time. …
  • Response time.

What are the different criteria for measuring the performance of scheduling mechanism?

Throughput: The measure of work done in a unit time interval. Turnaround Time (tat): The sum of time spent waiting to get into the ready queue, execution time and I/O time. Waiting Time (wt): Time spent in ready queue. Processor scheduling algorithms only affect the time spent waiting in the ready queue.

What are 4 major scheduling algorithms?

Operating System Scheduling algorithms
  • First-Come, First-Served (FCFS) Scheduling.
  • Shortest-Job-Next (SJN) Scheduling.
  • Priority Scheduling.
  • Shortest Remaining Time.
  • Round Robin(RR) Scheduling.
  • Multiple-Level Queues Scheduling.

What are the three types of CPU scheduling?

Types of CPU scheduling Algorithm. First Come First Serve. Shortest Remaining Time. Priority Based Scheduling.

Which of the following is scheduling criteria of CPU utilization Mcq?

CPU utilization (use of CPU), Throughput (number of processes completed per unit time), and Response time (time taken in an interactive program from the issuance of a command to the commencement of a response to that command) are the CPU scheduling criterions. Other such criterions are Turnaround time and waiting time.

What is a CPU scheduler?

The short-term scheduler (also known as the CPU scheduler) decides which of the ready, in-memory processes is to be executed (allocated a CPU) after a clock interrupt, an I/O interrupt, an operating system call or another form of signal.

What are two scheduling criteria?

5.2 Scheduling Criteria

Throughput – Number of processes completed per unit time. May range from 10 / second to 1 / hour depending on the specific processes. Turnaround time – Time required for a particular process to complete, from submission time to completion. ( Wall clock time. )

Which is the best CPU scheduling algorithm?

The FCFS is better for a small burst time. The SJF is better if the process comes to processor simultaneously. The last algorithm, Round Robin, is better to adjust the average waiting time desired.

Which scheduling algorithm allocates the CPU first?

First come first serve scheduling algorithm states that the process that requests the CPU first is allocated the CPU first. It is implemented by using the FIFO queue.

Which of the following scheduling algorithms is preemptive scheduling *?

Algorithms based on preemptive scheduling are: Round Robin (RR),Shortest Remaining Time First (SRTF), Priority (preemptive version), etc. 2.

What is the simplest CPU scheduling algorithm?

First-Come, First-Served (FCFS) Scheduling is the simplest CPU scheduling algorithm. It is like customers waiting in line at the bank or the post office or at a copying machine. Under it, the process that requests the CPU first is allocated the CPU first. However, the average waiting time under FCFS is long.

Which is not a CPU scheduling criteria?

It only affects the waiting time of a process i.e. time spent by a process waiting in the ready queue. In an interactive system, turn-around time is not the best criteria. … Thus another criteria is the time taken from submission of the process of request until the first response is produced.

Which module gives control of the CPU to the process?

A) Dispatcher is the model that controls the CPU to the process selected by the short-term scheduler.

Which scheduling algorithm allocates CPU first process with smallest burst time?

4.2 Shortest-Job-First (SJF) Scheduling

Run the process with the shortest CPU burst first. When the CPU is available, it is assigned to the process that has the shortest CPU burst.

Which of the following is not an Optimisation criteria for scheduling algorithm?

Which of the following is not an optimization criterion in the design of a CPU scheduling algorithm? Explanation: Minimum CPU utilization is not an optimization criterion as various optimization techniques and scheduling algorithms are used to bring the best CPU performance.

Which of the following scheduling algorithm is non-preemptive scheduling?

6. Which of the following is non-preemptive algorithm? Explanation: Priority scheduling is a non-preemptive algorithm and one of the most common scheduling algorithms in batch systems. 7.

Which algorithm is called the shortest remaining time first?

SRTF, Which Stands for Shortest Remaining Time First is a scheduling algorithm used in Operating Systems, which can also be called as the preemptive version of the SJF scheduling algorithm. The process which has the least processing time remaining is executed first.

What is burst time in scheduling?

Burst Time refers to the time required in milli seconds by a process for its execution. The Burst Time takes into consideration the CPU time of a process. The I/O time is not taken into consideration. It is called as the execution time or running time of the process.

What is preemptive CPU scheduling?

Preemptive Scheduling is a CPU scheduling technique that works by dividing time slots of CPU to a given process. … This scheduling is used when the process switch to ready state. Algorithms that are backed by preemptive Scheduling are round-robin (RR), priority, SRTF (shortest remaining time first).

What is first come first serve scheduling algorithm?

First come first serve (FCFS) scheduling algorithm simply schedules the jobs according to their arrival time. The job which comes first in the ready queue will get the CPU first. The lesser the arrival time of the job, the sooner will the job get the CPU.

What is the difference between preemptive scheduling and non preemptive scheduling?

The basic difference between preemptive and non-preemptive scheduling is that in preemptive scheduling the CPU is allocated to the processes for the limited time. While in Non-preemptive scheduling, the CPU is allocated to the process till it terminates or switches to waiting state.