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Questions and Answers
What is the primary drawback of the First Come First Serve (FCFS) scheduling algorithm?
What is the main advantage of the Shortest Job First (SJF) 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?
What is the primary difference between the non-preemptive and preemptive SJF scheduling algorithms?
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What is the main difficulty with implementing the SJF scheduling algorithm?
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What is the term used to describe the phenomenon where a process is continuously delayed and never gets a chance to execute?
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What is the name of the scheduling algorithm that selects the process with the highest response ratio next?
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What is the main advantage of the preemptive SJF scheduling algorithm over the non-preemptive algorithm?
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What is the term used to describe the time it takes for a process to complete its execution?
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What is the term used to describe the time a process spends waiting in the ready queue?
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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.
