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What is scheduling? Explain the types of schedulers.

Question

What is scheduling? Explain the types of schedulers.

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Solution

Scheduling is a method that is used to distribute valuable computing resources, usually processor time, bandwidth and memory, to efficiently execute and complete processes. It is a fundamental operating system function, which can handle resources between different tasks or processes running at the same time.

There are three types of schedulers in an operating system:

  1. Long-term or admission scheduler: This scheduler controls the admission of new processes into the system. It decides which processes are admitted to the system and when. The main objective of this scheduler is to provide a balanced mix of jobs, such as I/O bound and processor bound.

  2. Short-term or CPU scheduler: This scheduler is responsible for deciding which of the processes in the ready queue will be executed (allocated to the CPU) next following a clock interrupt, an I/O interrupt, an operating system call or another form of signal. Its main objective is to increase system performance in accordance with the chosen set of criteria. It is only invoked when a process switches from running state to waiting state or from ready state to running state.

  3. Medium-term scheduler: This scheduler temporarily removes processes from main memory and places them on secondary memory (such as a disk drive) or vice versa. This is done as part of the swapping function, such as to better balance the need for optimal (or near optimal) performance and the need for less frequently used resources.

Each type of scheduler works together to handle processes during their lifecycle to ensure efficient execution.

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