Explain the differences between preemptive and non-preemptive scheduling algorithms in CPU scheduling.
Understand the Problem
The question is asking for an explanation of CPU scheduling algorithms, specifically the differences between preemptive and non-preemptive scheduling. It describes how the operating system manages process execution and how the CPU switches between processes.
Answer
Preemptive allows interruptions for high-priority runs; non-preemptive lets processes finish uninterrupted. Preemptive is more responsive but costly; non-preemptive is simpler but can cause delays.
Preemptive scheduling allows the operating system to interrupt a currently running process to prioritize and allocate CPU to a higher priority process. Non-preemptive scheduling lets a process continue until it concludes or voluntarily yields control. Preemptive scheduling improves responsiveness at the cost of higher context-switch overhead, whereas non-preemptive scheduling is simpler with lower overhead but can cause delays for lower-priority processes.
Answer for screen readers
Preemptive scheduling allows the operating system to interrupt a currently running process to prioritize and allocate CPU to a higher priority process. Non-preemptive scheduling lets a process continue until it concludes or voluntarily yields control. Preemptive scheduling improves responsiveness at the cost of higher context-switch overhead, whereas non-preemptive scheduling is simpler with lower overhead but can cause delays for lower-priority processes.
More Information
Preemptive scheduling is often used in real-time operating systems where response time is critical. Non-preemptive scheduling is easier to implement and is typically used in simpler or older systems.
Tips
One common mistake is to confuse the terms 'preemptive' and 'non-preemptive' with 'priority'; a high-priority process in non-preemptive scheduling still has to wait for its turn.
Sources
- Difference between Preemptive and Non-Preemptive Scheduling - geeksforgeeks.org
- Preemptive vs Non-Preemptive Scheduling: Key Differences in CPU Scheduling - medium.com
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