Which scheduling algorithm is best?
Table of Contents
Which scheduling algorithm is best?
The calculation of three algorithms shows the different average waiting time. 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.
What is Process Scheduling and its types?
Six types of process scheduling algorithms are: First Come First Serve (FCFS), 2) Shortest-Job-First (SJF) Scheduling 3) Shortest Remaining Time 4) Priority Scheduling 5) Round Robin Scheduling 6) Multilevel Queue Scheduling. The CPU uses scheduling to improve its efficiency.
What are the three levels of process scheduling?
There are mainly three types of Process Schedulers:
- Long Term.
- Short Term.
- Medium Term.
What is short time 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.
Which one is not a type of scheduler?
Discussion Forum
| Que. | Which of the following is not a type of a schedule? |
|---|---|
| b. | Dependent schedule |
| c. | Recoverable schedule |
| d. | None of the mentioned |
| Answer:None of the mentioned |
How many states are there in process life cycle?
five states
Which one is not a scheduling algorithm?
Multiple-level queues are not an independent scheduling algorithm. They make use of other existing algorithms to group and schedule jobs with common characteristics. Multiple queues are maintained for processes with common characteristics. Each queue can have its own scheduling algorithms.
How do you do round robin scheduling?
Example of Round-robin Scheduling
- Step 1) The execution begins with process P1, which has burst time 4.
- Step 2) At time =2, P1 is added to the end of the Queue and P2 starts executing.
- Step 3) At time=4 , P2 is preempted and add at the end of the queue.
- Step 4) At time=6 , P3 is preempted and add at the end of the queue.
What are the scheduling criteria for CPU scheduling?
The criteria include the following:
- CPU utilisation – The main objective of any CPU scheduling algorithm is to keep the CPU as busy as possible.
- Throughput – A measure of the work done by CPU is the number of processes being executed and completed per unit time.
- Turnaround time –
- Waiting time –
- Response time –
What are the characteristics of a good scheduling algorithm?
Various criteria or characteristics that help in designing a good scheduling algorithm are:
- CPU Utilization − A scheduling algorithm should be designed so that CPU remains busy as possible.
- Throughput − Throughput is the amount of work completed in a unit of time.
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.
What is waiting time in CPU scheduling?
Waiting time is the total time spent by the process in the ready state waiting for CPU. For example, consider the arrival time of all the below 3 processes to be 0 ms, 0 ms, and 2 ms and we are using the First Come First Serve scheduling algorithm.
How is process waiting time calculated?
Calculating Average Waiting Time
- Hence, waiting time for P1 will be 0.
- P1 requires 21 ms for completion, hence waiting time for P2 will be 21 ms.
- Similarly, waiting time for process P3 will be execution time of P1 + execution time for P2, which will be (21 + 3) ms = 24 ms .
