Preemptive and Non-Preemptive Scheduling in Operating Systems
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Questions and Answers

What is the primary drawback of the First Come First Serve (FCFS) scheduling algorithm?

  • It is a variant of the Round Robin scheduling algorithm
  • It is non-preemptive and does not allow for context switching
  • It is not suitable for multi-threading environments
  • It is biased in favor of long processes (correct)

    • What is the main advantage of the Shortest Job First (SJF) scheduling algorithm?

  • It reduces the bias in favor of long processes (correct)
  • It is a preemptive scheduling algorithm
  • It is a variant of the Priority scheduling algorithm
  • It is a non-preemptive scheduling algorithm

    • What is the name of the scheduling algorithm that is a variant of SJF and takes into account the remaining burst time of a process?

  • Shortest Remaining Time (SRT) (correct)
  • Shortest Process Next (SPN)
  • Shortest Job First (SJF)
  • Highest Response Ratio Next (HRRN)

    • What is the primary difference between the non-preemptive and preemptive SJF scheduling algorithms?

    <p>The non-preemptive algorithm does not allow for context switching</p> Signup and view all the answers

    What is the main difficulty with implementing the SJF scheduling algorithm?

    <p>Estimating the required processing time of each process</p> Signup and view all the answers

    What is the term used to describe the phenomenon where a process is continuously delayed and never gets a chance to execute?

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

    What is the name of the scheduling algorithm that selects the process with the highest response ratio next?

    <p>Highest Response Ratio Next (HRRN)</p> Signup and view all the answers

    What is the main advantage of the preemptive SJF scheduling algorithm over the non-preemptive algorithm?

    <p>It allows for context switching</p> Signup and view all the answers

    What is the term used to describe the time it takes for a process to complete its execution?

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

    What is the term used to describe the time a process spends waiting in the ready queue?

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

    Study Notes

    Scheduling

    • Preemptive scheduling: a process can be interrupted and resumed, allowing for more flexible scheduling.
    • Non-preemptive scheduling: a process cannot be interrupted once it starts executing, and must run to completion.

    Characteristics of Preemptive Scheduling

    • A process can be interrupted and resumed.
    • CPU utilization is more efficient compared to non-preemptive scheduling.
    • Waiting and response times are shorter compared to non-preemptive scheduling.
    • Highest priority process is executed first.

    Characteristics of Non-preemptive Scheduling

    • A process cannot be interrupted once it starts executing.
    • CPU utilization is less efficient compared to preemptive scheduling.
    • Waiting and response times are higher compared to preemptive scheduling.

    Scheduling Algorithms

    • First Come First Serve (FCFS): process that arrives first is executed first.
    • Shortest Job First (SJF): process with the shortest burst time is executed next.
    • Round Robin Scheduling: each process is given a fixed time slice (called a time quantum) to execute before switching to the next process.
    • Highest Response Ratio Next (HRRN): process with the highest response ratio is executed next.

    Shortest Job First (SJF)

    • Non-preemptive SJF: process with the shortest burst time is executed next, and cannot be interrupted until completion.
    • Preemptive SJF (Shortest-Remaining-Time-First (SRTF)): if a new process arrives with a shorter burst time, the current process is preempted.

    Multithreading

    • A single PCB and user address space associated with the process.
    • Separate stacks for each thread.
    • Separate control block for each thread containing register values, priority, and other thread-related state information.
    • All threads of a process share the same state and resources of that process.
    • All threads reside in the same address space and have access to the same data.

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    Description

    Test your understanding of scheduling algorithms in Operating Systems. This quiz covers the differences between Preemptive and Non-Preemptive Scheduling, including process allocation, CPU usage, and job completion.

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