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OSNews: Bossa, A Framework for Scheduler Development

Jul 11, 2004, 19:00 (0 Talkback[s])
(Other stories by Christophe Augier)

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"Most commodity computers can only run one process at a time, and yet the user will have the impression that many programs run in parallel. This illusion is created by the operating system scheduler. To do so, the scheduler causes the system to switch quickly between processes. Each process runs for a certain time, and when a process times out the scheduler chooses which process to execute next on the CPU. Therefore, the behavior of a system mainly depends on the scheduler. Fairness, efficiency, latency; the scheduler must balance these properties to offer the appropriate behavior. Hence while a scheduler aimed to desktop applications should emphasize the interactivity, server-oriented schedulers should emphasize efficiency and respond correctly to scalability issues. When implementing a scheduling algorithm the developer must take into account that each property has an impact on the others..."

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