Podcast
Questions and Answers
What is the main responsibility of the CPU scheduler?
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 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?
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?
What does the dispatcher module do?
What is dispatch latency?
What is dispatch latency?
When does process execution consist of a cycle of CPU execution and I/O wait?
When does process execution consist of a cycle of CPU execution and I/O wait?
What is the main goal of CPU utilization in scheduling criteria?
What is the main goal of CPU utilization in scheduling criteria?
What does the turnaround time measure in scheduling criteria?
What does the turnaround time measure in scheduling criteria?
What is the implementation of the First-Come, First-Served (FCFS) scheduling algorithm based on?
What is the implementation of the First-Come, First-Served (FCFS) scheduling algorithm based on?
What is the average waiting time under the FCFS policy dependent on?
What is the average waiting time under the FCFS policy dependent on?
What scenario may result when there is one CPU-bound process and many I/O-bound processes under FCFS scheduling?
What scenario may result when there is one CPU-bound process and many I/O-bound processes under FCFS scheduling?
What effect is observed due to one CPU-bound process holding the CPU for an extended period under FCFS scheduling?
What effect is observed due to one CPU-bound process holding the CPU for an extended period under FCFS scheduling?
What is the optimization criterion associated with FCFS scheduling?
What is the optimization criterion associated with FCFS scheduling?
In which order do processes get allocated the CPU under FCFS scheduling?
In which order do processes get allocated the CPU under FCFS scheduling?
What type of scheduling algorithm is First-Come, First-Served (FCFS)?
What type of scheduling algorithm is First-Come, First-Served (FCFS)?
What type of queue is used to manage the implementation of FCFS policy?
What type of queue is used to manage the implementation of FCFS policy?
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.
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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.
