Computer Science Scheduling Algorithms
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Computer Science Scheduling Algorithms

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Questions and Answers

What is the average turnaround time for the given processes?

  • 6.4 time units
  • 8.2 time units
  • 7.6 time units (correct)
  • 5.8 time units
  • How is turnaround time calculated?

  • Turnaround = Completion Time - Burst Time
  • Turnaround = Completion Time - Arrival Time (correct)
  • Turnaround = Burst Time + Arrival Time
  • Turnaround = Arrival Time - Completion Time
  • Which of the following statements best describes the Shortest Remaining Time First (SRTF) algorithm?

  • It runs processes based on their arrival sequence only.
  • It treats all processes equally and runs them in a strict order.
  • It always allows the longest job to run first.
  • It chooses the process with the shortest remaining time to run next. (correct)
  • What happens when a process's quantum expires in a Round-Robin scheduling algorithm?

    <p>The process is pre-empted and moved to the end of the ready queue.</p> Signup and view all the answers

    Which process has the highest turnaround time based on the given data?

    <p>P4</p> Signup and view all the answers

    What is the formula for calculating response time in a scheduling algorithm?

    <p>Response Time = Time of First CPU Allocation - Arrival Time</p> Signup and view all the answers

    Which is a key characteristic of the Round-Robin scheduling algorithm?

    <p>It uses a fixed time quantum for all processes.</p> Signup and view all the answers

    In the context of performance metrics, what does a lower average turnaround time indicate?

    <p>Processes are completing more quickly.</p> Signup and view all the answers

    What is the main principle used in the Round-Robin scheduling algorithm?

    <p>First In, First Out (FIFO) principle</p> Signup and view all the answers

    A quantum in the Round-Robin scheduling algorithm is defined as what?

    <p>The time slice allocated to each process</p> Signup and view all the answers

    Which of the following statements about small quantum sizes in Round-Robin scheduling is true?

    <p>They can reduce CPU efficiency due to high switching overhead</p> Signup and view all the answers

    If a process has a service time of 6 ms and arrives at time 2 ms, how long will the process wait in the Ready Queue after its service starts?

    <p>4 ms</p> Signup and view all the answers

    What is the average response time for processes that arrive at times 0 ms, 2 ms, and 4 ms with respective service times of 3 ms, 6 ms, and 4 ms?

    <p>3 time units</p> Signup and view all the answers

    What is the purpose of calculating turnaround time in scheduling algorithms?

    <p>To compute the total time taken from arrival to completion</p> Signup and view all the answers

    Which performance metric indicates the time from the completion of a process until the next one starts?

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

    Which scheduling algorithm focuses on the process with the shortest remaining service time?

    <p>Shortest Remaining Time First</p> Signup and view all the answers

    Which scheduling type would most likely lead to poor response times?

    <p>Large quantum size</p> Signup and view all the answers

    In Round-Robin scheduling, how can a larger quantum improve CPU efficiency?

    <p>By minimizing overhead from context switching</p> Signup and view all the answers

    If Process P1 has a burst time of 4 and arrives at time 0, what is its response time if it starts executing immediately?

    <p>0 time units</p> Signup and view all the answers

    Which of the following statements is true regarding the Round-Robin scheduling method?

    <p>It assigns a fixed time quantum for each process</p> Signup and view all the answers

    What is the average turnaround time for the processes given with a set of burst times of 4, 1, 6, 2, 5, and 2, in a Round-Robin schedule?

    <p>9 time units</p> Signup and view all the answers

    What criteria does the Shortest Remaining Time First scheduling algorithm use to select the next process to execute?

    <p>The process with the least amount of burst time remaining</p> Signup and view all the answers

    If a process has a burst time of 6 and arrives at time 3, how is its turnaround time affected in a Round-Robin scheduling scenario?

    <p>It may increase depending on other processes' execution</p> Signup and view all the answers

    How is the average response time calculated across multiple processes?

    <p>Total response times divided by the number of processes</p> Signup and view all the answers

    Study Notes

    Shortest Remaining Time First Algorithm

    • The shortest remaining time first algorithm is a preemptive scheduling algorithm which selects the job with the smallest remaining burst (or service) time.
    • The algorithm is efficient as it provides the lowest average waiting time.
    • Performance Metrics:
      • Turnaround Time: The difference between completion time and the arrival time of a process; it is the amount of time a process is in the system.
      • Average Turnaround: The average time it takes for a process to complete.

    Round-Robin Algorithm

    • The Round-Robin algorithm is a scheduling algorithm that assigns equal time intervals to each process, known as quantum.
    • This algorithm uses preemption based on a clock.
    • The algorithm runs in the following situations:
      • When the currently running process is finished.
      • When the CPU is available.
      • When the quantum for the running process has expired.
    • If a process is not finished after its quantum, it is added to the end of the ready queue and waits to run again.

    Round-Robin Algorithm Performance Metrics

    • Response Time: This is the amount of time it takes for a process to start execution after it arrives in the system.
    • Average Response Time: This is the average time it takes for a process to start after arriving.
    • Turnaround Time: Similar to the SRTF algorithm, this is the time it takes for a process to compete.
    • Average Turnaround Time: The average time it takes for all processes to complete.

    Exercises

    • Exercise 1:
      • The exercise requires the user to simulate CPU scheduling using SRTF and Round Robin algorithms as well as calculate turnaround and response time for six processes.
    • Exercise 2:
      • The exercise requires the user to simulate CPU scheduling using SRTF and Round Robin algorithms as well as calculate turnaround and response time for three processes.

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    Description

    This quiz covers essential scheduling algorithms in computer science, focusing on the Shortest Remaining Time First and Round-Robin methods. It explores their efficiency, turnaround times, and performance metrics. Test your understanding of these crucial concepts in process management!

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