OS22 - Earliest Deadline First (EDF) Scheduling

In computer science, real-time scheduling analysis is the evaluation, testing and verification of the scheduling system and the algorithms used in real-time operations. For critical operations, a real-time system must be tested and verified for performanc

# Real-Time CPU scheduling ## Soft real-time system * 會盡量完成工作，不保證 ## Hard real-time system * 所有工作都要在時間內完成 ## 兩種影響效能的延遲 1.

在real-time system中，根據優先權做排程 (priority-based scheduling)是很重要的 (只在soft real-time有保證)。 假設process的執行時間是t、deadline是d、週期時間是p，如果t < d < p，check的頻率就是1/p。

In particular, seminal literature addressing the problem of real-time scheduling of the processing capacity in these architectures is presented.

Based on the list of tasks to be run, and the expected completion time for each, we can define (at design or build time) a fixed schedule that will ensure timely execution of all tasks.

If sporadic processes are of length multiple of q, and each q is treated as critical sections, the process model is reduced to an independent process scheduling with the provision that a process may be interrupted only after it has received an integer num

In real-time systems, the scheduler is considered as the most important component which is typically a short-term task scheduler. The main focus of this scheduler is to reduce the response time associated with each of the associated processes instead of h