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35. Process Priorities and Scheduling > Overview of Realtime Process Scheduling

Overview of Realtime Process Scheduling

The standard kernel scheduling algorithm usually provides adequate performance and responsiveness for the mixture of interactive and background processes typically run on a system. However, realtime applications have more stringent requirements of a scheduler, including the following:

  • A realtime application must provide a guaranteed maximum response time for external inputs. In many cases, these guaranteed maximum response times must be quite small (e.g., of the order of a fraction of a second). For example, a slow response by a vehicle navigation system could be catastrophic. To satisfy this requirement, the kernel must provide the facility for a high-priority process to obtain control of the CPU in a timely fashion, preempting any process that may currently be running.


  

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