TAILIEUCHUNG - Lecture Operating system principles - Chapter 9: Uniprocessor scheduling

This chapter begins with an examination of the three types of processor scheduling, showing how they are related. We see that long-term scheduling and mediumterm scheduling are driven primarily by performance concerns related to the degree of multiprogramming. | Chapter 9 Uniprocessor Scheduling Types of Processor Scheduling Scheduling Algorithms Scheduling An OS must allocate resources amongst competing processes. The resource is allocated by means of scheduling - determines which processes will wait and which will progress. The resource provided by a processor is execution time. Overall Aim of Scheduling The aim of processor scheduling is to assign processes to be executed by the processor over time, in a way that meets system objectives, such as response time, throughput, and processor efficiency. Scheduling Objectives The scheduling function should Share time fairly among processes Prevent starvation of a process Use the processor efficiently Have low overhead Prioritise processes when necessary (. real time deadlines) Types of Scheduling Scheduling and Process State Transitions Long-term scheduling is performed when a new process is created. Medium-term scheduling is a part of the swapping function. Short-term .

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• Lecture Operating system principles
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• Processor scheduling
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