Anonymous
Aug 6
Characteristics of scheduling algorithms in process scheduling ?
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ChatGPT
Aug 6
1. Preemptive vs. non-preemptive: Preemptive scheduling algorithms allow the operating system to interrupt a process and switch to another process, while non-preemptive algorithms do not allow this interruption.
2. Priority-based: Some scheduling algorithms prioritize certain processes over others based on factors such as the process's importance or deadline.
3. Round-robin: This algorithm assigns a fixed time slice to each process in a circular queue, allowing each process to run for a specified amount of time before moving on to the next process.
4. Shortest Job First (SJF): This algorithm selects the process with the shortest burst time to execute next, minimizing the average waiting time for all processes.
5. First-Come, First-Served (FCFS): This algorithm schedules processes in the order they arrive in the ready queue, without considering the burst time or priority of the processes.
6. Shortest Remaining Time (SRT): This is a preemptive version of the SJF algorithm, where the process with the shortest remaining time is selected to execute next.
7. Multilevel Queue: This algorithm divides processes into different queues based on their priority or characteristics, and each queue has its own scheduling algorithm.
8. Multilevel Feedback Queue: This algorithm allows processes to move between different queues based on their behavior, such as aging or priority changes.
9. Lottery Scheduling: This algorithm assigns each process a number of lottery tickets, and a random ticket is drawn to select the next process to execute.
10. Fair-share Scheduling: This algorithm ensures that each process gets a fair share of the CPU time, regardless of its priority or burst time.
2. Priority-based: Some scheduling algorithms prioritize certain processes over others based on factors such as the process's importance or deadline.
3. Round-robin: This algorithm assigns a fixed time slice to each process in a circular queue, allowing each process to run for a specified amount of time before moving on to the next process.
4. Shortest Job First (SJF): This algorithm selects the process with the shortest burst time to execute next, minimizing the average waiting time for all processes.
5. First-Come, First-Served (FCFS): This algorithm schedules processes in the order they arrive in the ready queue, without considering the burst time or priority of the processes.
6. Shortest Remaining Time (SRT): This is a preemptive version of the SJF algorithm, where the process with the shortest remaining time is selected to execute next.
7. Multilevel Queue: This algorithm divides processes into different queues based on their priority or characteristics, and each queue has its own scheduling algorithm.
8. Multilevel Feedback Queue: This algorithm allows processes to move between different queues based on their behavior, such as aging or priority changes.
9. Lottery Scheduling: This algorithm assigns each process a number of lottery tickets, and a random ticket is drawn to select the next process to execute.
10. Fair-share Scheduling: This algorithm ensures that each process gets a fair share of the CPU time, regardless of its priority or burst time.
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Google Gemini AI
Aug 6
Fairness:
- Ensures that processes receive approximately equal amounts of CPU time.
Throughput:
- Maximizes the number of processes completed per unit time.
Response Time:
- Minimizes the time it takes for a process to receive its first CPU burst.
Turnaround Time:
- Minimizes the total time it takes a process to complete its execution.
Control Overhead:
- The amount of time and resources required to manage the scheduling algorithm. Lower overhead is desirable.
Preemption:
- Whether or not the algorithm can suspend a running process and replace it with a higher-priority process.
Starvation:
- Avoidance of situations where a process waits indefinitely for CPU time.
Flexibility:
- The ability of the algorithm to adapt to changing conditions, such as process priority or arrival rate.
Scalability:
- The algorithm's performance when used in systems with varying numbers of processes or CPUs.
Complexity:
- The time and space complexity of the algorithm in terms of implementation and execution.
Other Characteristics:
- Priority Scheduling: Assigns higher priority to processes with greater importance.
- Non-preemptive Scheduling: Once a process starts execution, it cannot be preempted by another process.
- Preemptive Scheduling: Allows higher-priority processes to preempt lower-priority processes.
- Time-Slicing: Divides the CPU time into equal intervals (timeslices) and allocates them to processes in a round-robin fashion.
- Multi-level Queue Scheduling: Divides processes into multiple queues based on priority or other criteria.
- Ensures that processes receive approximately equal amounts of CPU time.
Throughput:
- Maximizes the number of processes completed per unit time.
Response Time:
- Minimizes the time it takes for a process to receive its first CPU burst.
Turnaround Time:
- Minimizes the total time it takes a process to complete its execution.
Control Overhead:
- The amount of time and resources required to manage the scheduling algorithm. Lower overhead is desirable.
Preemption:
- Whether or not the algorithm can suspend a running process and replace it with a higher-priority process.
Starvation:
- Avoidance of situations where a process waits indefinitely for CPU time.
Flexibility:
- The ability of the algorithm to adapt to changing conditions, such as process priority or arrival rate.
Scalability:
- The algorithm's performance when used in systems with varying numbers of processes or CPUs.
Complexity:
- The time and space complexity of the algorithm in terms of implementation and execution.
Other Characteristics:
- Priority Scheduling: Assigns higher priority to processes with greater importance.
- Non-preemptive Scheduling: Once a process starts execution, it cannot be preempted by another process.
- Preemptive Scheduling: Allows higher-priority processes to preempt lower-priority processes.
- Time-Slicing: Divides the CPU time into equal intervals (timeslices) and allocates them to processes in a round-robin fashion.
- Multi-level Queue Scheduling: Divides processes into multiple queues based on priority or other criteria.
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