CPU Scheduling Quiz and Flashcards: Operating System Basics

Podcast Beta

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the main responsibility of the CPU scheduler?

Switching the CPU between user mode and kernel mode

Handling I/O operations for processes in memory

Managing the dispatcher module

Selecting processes in memory ready to execute and allocating the CPU to one of them (correct)

When does a CPU scheduling decision take place?

When a process switches from running to waiting state

When a process switches from running to ready state

When a process switches from waiting to ready state

All of the above (correct)

Which type of scheduling is non-preemptive?

Scheduling when a process switches from running to ready state

Scheduling when a process switches from waiting to ready state

Scheduling when a process switches from running to waiting state

Scheduling when a process terminates (correct)

What does the dispatcher module do?

Gives control of the CPU to the process selected by the short-term scheduler Signup and view all the answers

What is dispatch latency?

The time it takes for the dispatcher to stop one process and start another running Signup and view all the answers

When does process execution consist of a cycle of CPU execution and I/O wait?

When a process switches from running to waiting state Signup and view all the answers

What is the main goal of CPU utilization in scheduling criteria?

To keep the CPU as busy as possible Signup and view all the answers

What does the turnaround time measure in scheduling criteria?

The amount of time to execute a particular process Signup and view all the answers

What is the implementation of the First-Come, First-Served (FCFS) scheduling algorithm based on?

A FIFO queue Signup and view all the answers

What is the average waiting time under the FCFS policy dependent on?

The order in which processes arrive at the ready queue Signup and view all the answers

What scenario may result when there is one CPU-bound process and many I/O-bound processes under FCFS scheduling?

The CPU will sit idle most of the time while waiting for I/O-bound processes to complete execution Signup and view all the answers

What effect is observed due to one CPU-bound process holding the CPU for an extended period under FCFS scheduling?

A convoy effect where all other processes wait for the one big process to get off the CPU Signup and view all the answers

What is the optimization criterion associated with FCFS scheduling?

Min waiting time Signup and view all the answers

In which order do processes get allocated the CPU under FCFS scheduling?

Based on their arrival time at the ready queue Signup and view all the answers

What type of scheduling algorithm is First-Come, First-Served (FCFS)?

Non-preemptive scheduling algorithm Signup and view all the answers

What type of queue is used to manage the implementation of FCFS policy?

FIFO queue Signup and view all the answers

Study Notes

CPU Scheduling

The main responsibility of the CPU scheduler is to allocate the CPU to a process among the available processes.
A CPU scheduling decision takes place when a process:
- Switches from running to waiting state
- Switches from waiting to ready state
- Terminates

Non-Preemptive Scheduling

FCFS (First-Come, First-Served) scheduling is a non-preemptive type of scheduling.

Dispatcher Module

The dispatcher module gives control of the CPU to the process selected by the CPU scheduler.
It is responsible for context switching.

Dispatch Latency

Dispatch latency is the time taken by the dispatcher to stop one process and start another.

Process Execution Cycle

Process execution consists of a cycle of CPU execution and I/O wait when the process spends some time on the CPU and then waits for I/O operations.

CPU Utilization

The main goal of CPU utilization in scheduling criteria is to maximize the CPU usage.

Turnaround Time

The turnaround time measures the total time taken by a process to complete its execution.

FCFS Scheduling

The implementation of the First-Come, First-Served (FCFS) scheduling algorithm is based on a queue.
The average waiting time under the FCFS policy is dependent on the order of arrival of the processes.
A scenario may result in CPU-bound process holding the CPU for an extended period, causing other processes to wait, when there is one CPU-bound process and many I/O-bound processes under FCFS scheduling.
This can lead to a convoy effect, where a long process holds the CPU for an extended period.
The optimization criterion associated with FCFS scheduling is to minimize the average waiting time.
Processes get allocated the CPU under FCFS scheduling in the order of their arrival.
FCFS is a non-preemptive scheduling algorithm.
A first-in, first-out (FIFO) queue is used to manage the implementation of the FCFS policy.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

Test your knowledge of CPU scheduling concepts such as scheduling criteria, algorithms, multiple-processor scheduling, real-time scheduling, and algorithm evaluation. This quiz covers basic concepts like maximum CPU utilization with multiprogramming and CPU-I/O burst cycle.

Operating System CPU Scheduling Basics