📖 6. CPU Scheduling

📖 From Operating System • 1570 questions available

About 6. CPU Scheduling

The CPU (Central Processing Unit) is the brain of the computer, and it can only do one thing at a time. CPU scheduling is the process the OS uses to decide which process gets to use the CPU and for how long. Since there are always many processes waiting for their turn, the scheduler acts like a manager who prioritizes tasks. The goal is to keep the CPU as busy as possible, while also being fair to all processes and making the system feel responsive to the user.

Different scheduling algorithms are used for different purposes. For example, a "Round Robin" algorithm gives each process a small time slice and cycles through them, which is great for interactive systems. "Priority scheduling" allows more important tasks to run first. The OS constantly switches between processes, giving the illusion that everything is running at the same time. A good scheduling policy makes a computer feel fast and efficient, even when it is juggling many demanding tasks.

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🔄 Last updated: 2026-07-10