Anonymous
Jun 27
Explain four different process scheduling algorithms?
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ChatGPT
Jun 27
1. First-Come, First-Served (FCFS): In this algorithm, the process that arrives first is executed first. The processes are executed in the order they arrive, and the CPU is allocated to each process until it completes its execution. This algorithm is simple and easy to implement but may lead to poor utilization of CPU and longer waiting times for processes that arrive later.
2. Shortest Job Next (SJN): In this algorithm, the process with the shortest burst time is executed next. This algorithm aims to minimize the average waiting time of processes by executing the shortest jobs first. However, it may lead to starvation of longer processes if shorter processes keep arriving.
3. Round Robin (RR): In this algorithm, each process is assigned a fixed time slice or quantum to execute on the CPU. Once the time slice expires, the process is preempted, and the CPU is allocated to the next process in the queue. This algorithm ensures fairness among processes and prevents starvation, but it may lead to higher context switching overhead.
4. Priority Scheduling: In this algorithm, each process is assigned a priority value, and the process with the highest priority is executed first. The priority can be based on factors such as the process's importance, deadline, or resource requirements. This algorithm allows for more flexibility in scheduling and can prioritize critical processes, but it may lead to starvation of lower priority processes if higher priority processes keep arriving.
2. Shortest Job Next (SJN): In this algorithm, the process with the shortest burst time is executed next. This algorithm aims to minimize the average waiting time of processes by executing the shortest jobs first. However, it may lead to starvation of longer processes if shorter processes keep arriving.
3. Round Robin (RR): In this algorithm, each process is assigned a fixed time slice or quantum to execute on the CPU. Once the time slice expires, the process is preempted, and the CPU is allocated to the next process in the queue. This algorithm ensures fairness among processes and prevents starvation, but it may lead to higher context switching overhead.
4. Priority Scheduling: In this algorithm, each process is assigned a priority value, and the process with the highest priority is executed first. The priority can be based on factors such as the process's importance, deadline, or resource requirements. This algorithm allows for more flexibility in scheduling and can prioritize critical processes, but it may lead to starvation of lower priority processes if higher priority processes keep arriving.
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Google Gemini AI
Jun 27
1. First-Come, First-Served (FCFS)
- Processes are scheduled in the order they arrive.
- Simplest algorithm, fair but can lead to starvation if a long-running process arrives early.
2. Shortest Job First (SJF)
- Processes are scheduled based on their estimated run time, with the shortest job being scheduled first.
- Minimizes average waiting time, but requires accurate estimates and can be subject to starvation.
3. Round-Robin (RR)
- Processes are scheduled in a circular queue, with each process getting a time slice to execute.
- Ensures fairness and prevents starvation, but can result in decreased throughput if time slices are too small.
4. Priority Scheduling
- Processes are assigned priorities, and the process with the highest priority is scheduled first.
- Provides flexibility and allows important processes to run more quickly, but can lead to lower priority processes being indefinitely delayed.
- Processes are scheduled in the order they arrive.
- Simplest algorithm, fair but can lead to starvation if a long-running process arrives early.
2. Shortest Job First (SJF)
- Processes are scheduled based on their estimated run time, with the shortest job being scheduled first.
- Minimizes average waiting time, but requires accurate estimates and can be subject to starvation.
3. Round-Robin (RR)
- Processes are scheduled in a circular queue, with each process getting a time slice to execute.
- Ensures fairness and prevents starvation, but can result in decreased throughput if time slices are too small.
4. Priority Scheduling
- Processes are assigned priorities, and the process with the highest priority is scheduled first.
- Provides flexibility and allows important processes to run more quickly, but can lead to lower priority processes being indefinitely delayed.
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