Process Scheduling Strategies Quiz
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Questions and Answers

What is the main task of the Long-Term Scheduler?

  • Decide which process to run
  • Control the movement of tasks between the ready and run queues
  • Maximize throughput of the system
  • Select processes from the pool and maintain them in the ready queue (correct)

    • Which of the following is NOT a scheduling objective mentioned in the text?

  • Minimize response times (correct)
  • Balance resource use
  • Maximize throughput
  • Avoid indefinite postponement

    • Which scheduler is responsible for selecting jobs from the pool (secondary memory) and maintaining them in the ready queue?

  • Medium-Term Scheduler
  • Long-Term Scheduler (correct)
  • Job Scheduler
  • Short-Term Scheduler

    • What is the goal of the Long-Term Scheduler?

    <p>Select the best mix of IO and CPU bound processes</p> Signup and view all the answers

    Which type of scheduler decides which process to run on the system?

    <p>Short-Term Scheduler</p> Signup and view all the answers

    What is one of the responsibilities of the OS scheduler mentioned in the text?

    <p>Select jobs to be submitted into the system</p> Signup and view all the answers

    Why is it important to maximize CPU utilization?

    <p>To improve system efficiency and productivity</p> Signup and view all the answers

    What does a high throughput indicate?

    <p>Efficient task processing</p> Signup and view all the answers

    Why is it important to minimize waiting time in CPU scheduling?

    <p>As it reflects the efficiency of the scheduling algorithm</p> Signup and view all the answers

    What is the significance of maximizing throughput in batch processing systems?

    <p>Improving system efficiency and productivity</p> Signup and view all the answers

    How does minimizing turnaround time impact user satisfaction?

    <p>It reflects the overall efficiency of the system</p> Signup and view all the answers

    In CPU scheduling, why is it crucial to prioritize response time?

    <p>Because a long response time reduces system efficiency</p> Signup and view all the answers

    Which CPU scheduling algorithm aims to reduce response time for tasks that require immediate attention?

    <p>Round Robin</p> Signup and view all the answers

    Which criterion measures the amount of time a task or process waits in the ready queue before being processed by the CPU?

    <p>Waiting Time</p> Signup and view all the answers

    What is the main goal of multilevel queue scheduling in operating systems?

    <p>To strike a balance between fairness and performance</p> Signup and view all the answers

    Which type of processes are typically given the highest priority in the multilevel queue architecture?

    <p>System Processes</p> Signup and view all the answers

    What are batch processes in the context of multilevel queue scheduling?

    <p>Resource-intensive processes executed in the background</p> Signup and view all the answers

    Which queue is prioritized for interactive processes that need quick system responses?

    <p>Foreground Queue</p> Signup and view all the answers

    Why are system processes like device drivers and interrupt handlers placed in the System Queue?

    <p>Because they require special permissions for completion</p> Signup and view all the answers

    In multilevel queue scheduling, what is the purpose of sorting processes into different queues?

    <p>To group processes based on their priority and characteristics</p> Signup and view all the answers

    Which processes are executed before other types of processes in the multilevel queue architecture?

    <p><em>System Processes</em></p> Signup and view all the answers

    What is the major difference between interactive and batch processes in multilevel queue scheduling?

    <p><em>Interactive processes demand immediate user responses, while batch processes are non-interactive</em></p> Signup and view all the answers

    'Foreground Queue' in multilevel queue scheduling is primarily used for which type of processes?

    <p><em>Interactive processes demanding quick responses</em></p> Signup and view all the answers

    'Real-time Queue' in multilevel queue scheduling is reserved for which kind of processes?

    <p><em>Processes demanding lengthy execution times</em></p> Signup and view all the answers

    What is one advantage of using MLFQ scheduling in real-time systems?

    <p>Improved response time for procedures</p> Signup and view all the answers

    In what scenario is MLFQ commonly used to enhance the user experience?

    <p>Playing games</p> Signup and view all the answers

    What is a key feature of MLFQ scheduling that allows it to optimize CPU utilization?

    <p>Dynamic priority adjustment based on process behavior</p> Signup and view all the answers

    What is one disadvantage of MLFQ scheduling mentioned in the text?

    <p>Priority inversion causing delays for high-priority tasks</p> Signup and view all the answers

    How does MLFQ scheduling handle background tasks like listening to audio or communicating?

    <p>By giving them lower priority than other tasks</p> Signup and view all the answers

    What is a characteristic of MLFQ scheduling that makes it challenging to implement compared to simpler techniques?

    <p>Complex management of queues with varying priorities and time quantum</p> Signup and view all the answers

    What is the primary function of the Long-Term scheduler?

    <p>Controls the degree of multiprogramming by selecting processes</p> Signup and view all the answers

    What can happen if the Short-Term scheduler selects a job with a long CPU burst time?

    <p>The processes may experience hunger due to delays</p> Signup and view all the answers

    Which scheduler is responsible for removing processes from memory and handling swapped out-processes?

    <p>Medium-Term scheduler</p> Signup and view all the answers

    In CPU scheduling, what is the importance of maximizing CPU utilization and throughput?

    <p>Improves resource allocation efficiency</p> Signup and view all the answers

    What role do CPU scheduling algorithms play in ensuring fairness in multi-user environments?

    <p>Ensure all processes have equal access to the CPU</p> Signup and view all the answers

    Which criterion measures the percentage of time the CPU is busy processing a task?

    <p>CPU utilization</p> Signup and view all the answers

    What happens if the Short-Term scheduler makes a mistake in selecting work?

    <p>Processes may experience starvation due to delays</p> Signup and view all the answers

    How does the Medium-Term scheduler contribute to reducing the degree of multiprogramming?

    <p>[It reduces the degree of multiprogramming]</p> Signup and view all the answers

    What is the main purpose of assigning priorities to queues in multilevel queue scheduling?

    <p>To ensure that crucial tasks are executed first</p> Signup and view all the answers

    In multilevel queue scheduling, what happens if a process keeps getting assigned to a lower-priority queue and never gets a chance to run?

    <p>The process may experience starvation</p> Signup and view all the answers

    What benefit does multilevel queue scheduling provide for interactive processes?

    <p>Quick reaction times</p> Signup and view all the answers

    Why is careful selection of scheduling algorithms and priorities essential in multilevel queue scheduling?

    <p>To avoid subpar performance</p> Signup and view all the answers

    What is a major drawback of using multiple queues in multilevel queue scheduling?

    <p>Higher chances of process starvation</p> Signup and view all the answers

    How does multilevel feedback queue scheduling differ from multilevel queue scheduling?

    <p>MLFQ adjusts priorities based on process behavior</p> Signup and view all the answers

    What is the purpose of having shorter delay periods for higher priority queues in MLFQ?

    <p>To expedite the execution of high-priority tasks</p> Signup and view all the answers

    What is the formula for calculating waiting time in the SJN algorithm?

    <p>Service Time - Arrival Time</p> Signup and view all the answers

    What is a disadvantage of the SJN algorithm?

    <p>It is impossible to implement in systems where CPU time is unknown.</p> Signup and view all the answers

    In Priority Scheduling, what happens when a higher priority task arrives while a lower priority task is being executed?

    <p>The higher priority task is suspended until the lower priority task completes.</p> Signup and view all the answers

    What is a common disadvantage of the Preemptive Priority CPU Scheduling Algorithm?

    <p>Starvation Problem</p> Signup and view all the answers

    In Shortest Remaining Time First (SRTF), what happens if short processes are continually added?

    <p>Short processes may be held off indefinitely.</p> Signup and view all the answers

    What does Round Robin CPU Scheduling algorithm focus on?

    <p>Starvation-free balanced CPU allocation</p> Signup and view all the answers

    Which scheduling algorithm is based on the concept of 'First come, first serve'?

    <p>First-Come, First-Served (FCFS) Scheduling</p> Signup and view all the answers

    Which scheduling algorithm is known for supporting both preemptive and non-preemptive CPU scheduling?

    <p>First-Come, First-Served (FCFS) Scheduling</p> Signup and view all the answers

    What is a disadvantage of First-Come, First-Served (FCFS) Scheduling?

    <p>Convoy effect</p> Signup and view all the answers

    In SJN scheduling, what happens if two processes have the same burst time?

    <p>FCFS scheduling is used to break the tie</p> Signup and view all the answers

    What distinguishes Preemptive SJN from Non-Preemptive SJN scheduling?

    <p>Processes can be interrupted during execution</p> Signup and view all the answers

    Which scheduling algorithm is known for its simplicity and ease of implementation?

    <p>First-Come, First-Served (FCFS) Scheduling</p> Signup and view all the answers

    What factor contributes to the inefficiency of First-Come, First-Served (FCFS) Scheduling?

    <p>High average waiting time</p> Signup and view all the answers

    What is the main goal of the Long-Term Scheduler?

    <p>Selecting the best mix of IO and CPU bound processes</p> Signup and view all the answers

    Which type of scheduler primarily handles process scheduling in various ways?

    <p>Job Scheduler</p> Signup and view all the answers

    What is the primary function of the Short-Term Scheduler?

    <p>Deciding which process to run</p> Signup and view all the answers

    What does the OS scheduler govern regarding tasks in the ready and run queues?

    <p>Balancing resource use</p> Signup and view all the answers

    Which criterion mainly characterizes the responsibility of Schedulers in process scheduling?

    <p>Maximizing throughput</p> Signup and view all the answers

    Why is it important to minimize turnaround time in CPU scheduling?

    <p>To reflect the overall efficiency of the system and enhance user satisfaction.</p> Signup and view all the answers

    Which scheduling algorithm is effective in batch processing systems for completing shorter jobs first?

    <p>Shortest Job First (SJF)</p> Signup and view all the answers

    What is the significance of minimizing waiting time in CPU scheduling?

    <p>To increase system efficiency and improve user satisfaction.</p> Signup and view all the answers

    Which criterion measures the number of tasks completed within a specific period?

    <p>Throughput</p> Signup and view all the answers

    Why is it crucial to minimize response time in CPU scheduling?

    <p>To ensure quick and efficient task processing for enhanced user satisfaction.</p> Signup and view all the answers

    What is one potential consequence of the Short-Term scheduler selecting a job with a long CPU burst time?

    <p>CPU will be idle for the majority of the time</p> Signup and view all the answers

    What is the main role of the Medium-Term scheduler?

    <p>Handle the swapping of processes between memory and secondary storage</p> Signup and view all the answers

    How does the Long-Term scheduler's speed compare to that of the Short-Term scheduler?

    <p>Long-Term scheduler's speed is slower than Short-Term scheduler</p> Signup and view all the answers

    What happens if a suspended process in the Medium-Term scheduler makes an I/O request?

    <p>It gets removed from memory and swapped out to secondary storage</p> Signup and view all the answers

    Why is efficient resource utilization important in CPU scheduling?

    <p>To improve system throughput and productivity</p> Signup and view all the answers

    What is a major drawback of Preemptive Shortest Job Next (SJN) scheduling compared to Non-Preemptive SJN scheduling?

    <p>Higher average waiting time</p> Signup and view all the answers

    Which statement best describes the Convoy effect as it relates to First-Come, First-Served (FCFS) scheduling?

    <p>It causes processes with short burst times to wait behind long processes.</p> Signup and view all the answers

    What is a key difference between Shortest Remaining Time and Shortest Job Next scheduling algorithms?

    <p>Use of preemptive vs. non-preemptive approaches</p> Signup and view all the answers

    What is the primary challenge of implementing Multilevel Queue scheduling in comparison to Round Robin (RR) scheduling?

    <p>Managing priority levels effectively</p> Signup and view all the answers

    How can the 'Convoy effect' observed in First-Come, First-Served (FCFS) scheduling be alleviated?

    <p>By implementing a preemptive scheduling algorithm</p> Signup and view all the answers

    What is a characteristic of Shortest Remaining Time First (SRTF) scheduling that distinguishes it from Shortest Job First (SJF)?

    <p>SRTF has a higher context switch overhead compared to SJF.</p> Signup and view all the answers

    What makes Round Robin CPU Scheduling algorithm different from First Come First Serve (FCFS) in terms of priority handling?

    <p>Round Robin allocates the CPU based on arrival time rather than priority.</p> Signup and view all the answers

    What is one significant drawback of implementing Priority Scheduling compared to other CPU scheduling algorithms?

    <p>Priority Scheduling may cause process starvation.</p> Signup and view all the answers

    How does Priority Scheduling differ from Round Robin in terms of handling task priorities?

    <p>Round Robin allocates CPU based on task priority levels.</p> Signup and view all the answers

    What distinguishes Shortest Remaining Time First (SRTF) scheduling from Round Robin in terms of process handling?

    <p>SRTF dynamically adjusts task priorities during execution.</p> Signup and view all the answers

    What is a potential consequence of not carefully selecting scheduling algorithms and priorities in multilevel queue scheduling?

    <p>System instability and subpar performance</p> Signup and view all the answers

    Why might a process experience starvation in a multilevel feedback queue scheduling system?

    <p>Being assigned to a lower-priority queue</p> Signup and view all the answers

    Which scenario is a drawback of using multiple queues in multilevel queue scheduling?

    <p>Inefficient resource use if not properly managed</p> Signup and view all the answers

    In the context of multilevel feedback queue scheduling, why are shorter delay periods beneficial for higher-priority queues?

    <p>To reduce the processing delay for important tasks</p> Signup and view all the answers

    What is a key advantage of using multilevel feedback queue scheduling in real-time systems?

    <p>Enhanced response time for critical tasks</p> Signup and view all the answers

    What is the main objective of multilevel queue scheduling?

    <p>Balancing fairness and performance in resource allocation</p> Signup and view all the answers

    Which type of processes are typically placed in the Background Queue in multilevel queue scheduling?

    <p>Batch processes</p> Signup and view all the answers

    What makes the Foreground Queue unique compared to other queues in multilevel queue scheduling?

    <p>Processes in this queue demand quick system responses</p> Signup and view all the answers

    Why are system processes typically granted the highest priority in the MLQ architecture?

    <p>Because they handle critical system operations</p> Signup and view all the answers

    What is the significance of prioritizing real-time processes in the Real-time Queue of multilevel queue scheduling?

    <p>For rapid response from the system</p> Signup and view all the answers

    What is a key advantage of MLFQ scheduling in terms of CPU utilization?

    <p>Automatically adjusting process priorities based on behavior</p> Signup and view all the answers

    Which aspect of MLFQ scheduling can lead to decreased system performance due to the need for constant tracking?

    <p>Overhead</p> Signup and view all the answers

    What is a common disadvantage associated with MLFQ scheduling due to its complexity?

    <p>Priority Inversion</p> Signup and view all the answers

    Why does MLFQ scheduling make it challenging to predict the completion time of processes?

    <p>Poor Predictability</p> Signup and view all the answers

    In what way does MLFQ scheduling optimize CPU utilization by preempting processes?

    <p>By preempting when allocated time quantum expires</p> Signup and view all the answers

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