Ramadhan Silas
Feb 13
Processor schedule with their characteristics?
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Feb 13
There are several different types of processor scheduling algorithms, each with their own characteristics. Here are some commonly used scheduling algorithms and their characteristics:
1. First-Come, First-Served (FCFS):
- Characteristics: Simple and easy to understand.
- Advantages: Fairness, as processes are executed in the order they arrive.
- Disadvantages: Poor performance in terms of average waiting time, as it does not consider the burst time of processes.
2. Shortest Job Next (SJN) or Shortest Job First (SJF):
- Characteristics: Selects the process with the smallest total execution time next.
- Advantages: Minimizes average waiting time and turnaround time.
- Disadvantages: Requires knowledge of the burst time of each process in advance, which is often not available.
3. Round Robin (RR):
- Characteristics: Each process is assigned a fixed time slice or quantum.
- Advantages: Fairness, as each process gets an equal amount of CPU time.
- Disadvantages: High overhead due to frequent context switching, and longer processes may have to wait for their turn.
4. Priority Scheduling:
- Characteristics: Each process is assigned a priority value, and the process with the highest priority is executed next.
- Advantages: Allows for prioritization of important processes.
- Disadvantages: May result in starvation of lower priority processes if higher priority processes continuously arrive.
5. Multilevel Queue Scheduling:
- Characteristics: Divides processes into multiple queues based on priority or other criteria.
- Advantages: Allows for different scheduling algorithms to be used for different queues, providing flexibility.
- Disadvantages: Complexity in managing multiple queues and determining the criteria for queue assignment.
6. Multilevel Feedback Queue Scheduling:
- Characteristics: Similar to multilevel queue scheduling, but allows processes to move between queues based on their behavior.
- Advantages: Provides a balance between fairness and responsiveness.
- Disadvantages: Complexity in managing the feedback mechanism and determining the criteria for queue movement.
These are just a few examples of processor scheduling algorithms and their characteristics. The choice of algorithm depends on the specific requirements and constraints of the system.
1. First-Come, First-Served (FCFS):
- Characteristics: Simple and easy to understand.
- Advantages: Fairness, as processes are executed in the order they arrive.
- Disadvantages: Poor performance in terms of average waiting time, as it does not consider the burst time of processes.
2. Shortest Job Next (SJN) or Shortest Job First (SJF):
- Characteristics: Selects the process with the smallest total execution time next.
- Advantages: Minimizes average waiting time and turnaround time.
- Disadvantages: Requires knowledge of the burst time of each process in advance, which is often not available.
3. Round Robin (RR):
- Characteristics: Each process is assigned a fixed time slice or quantum.
- Advantages: Fairness, as each process gets an equal amount of CPU time.
- Disadvantages: High overhead due to frequent context switching, and longer processes may have to wait for their turn.
4. Priority Scheduling:
- Characteristics: Each process is assigned a priority value, and the process with the highest priority is executed next.
- Advantages: Allows for prioritization of important processes.
- Disadvantages: May result in starvation of lower priority processes if higher priority processes continuously arrive.
5. Multilevel Queue Scheduling:
- Characteristics: Divides processes into multiple queues based on priority or other criteria.
- Advantages: Allows for different scheduling algorithms to be used for different queues, providing flexibility.
- Disadvantages: Complexity in managing multiple queues and determining the criteria for queue assignment.
6. Multilevel Feedback Queue Scheduling:
- Characteristics: Similar to multilevel queue scheduling, but allows processes to move between queues based on their behavior.
- Advantages: Provides a balance between fairness and responsiveness.
- Disadvantages: Complexity in managing the feedback mechanism and determining the criteria for queue movement.
These are just a few examples of processor scheduling algorithms and their characteristics. The choice of algorithm depends on the specific requirements and constraints of the system.
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