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Embedded real-time operating system ARTs-OS 's EDF scheduling improvements

Author: ChenLei
Tutor: LiuYunSheng
School: Huazhong University of Science and Technology
Course: Software Engineering
Keywords: Embedded real-time operating system Real-time scheduling algorithm EDF scheduling
CLC: TP316.2
Type: Master's thesis
Year: 2011
Downloads: 15
Quote: 0
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Abstract


As people in the production, life on the growing demand for real-time processing , embedded real-time operating system (Embedded Real-Time Operating System, referred ERTOS) more widely . Real-time scheduling algorithms for embedded real- time operating system has an important effect is to improve the real-time system of key technologies. ARTs-OS system is the independent research and development laboratory for embedded real-time operating system. System uses a micro-kernel architecture , the kernel is compact , can be dynamically loaded modules. Task management module using multi- process, multi- threaded mode , memory protection between processes , making the system performance and stability. Scheduling module using object-oriented thinking , through the realization of the scheduler object , you can easily without affecting other system modules to modify scheduling. Scheduling is the essence of CPU resource allocation and utilization. EDF algorithm as an optimal dynamic priority scheduling algorithm, running overhead, processor utilization is high, but the scheduling overhead big priority over a single decision-making mechanism does not reflect the importance of the task , in the case of system overload will generate \By introducing a degree of importance factor represents the task and the task deadline jointly decide the priority of the task can be more fully reflect the application requirements. System overload, the EDF scheduling algorithm can be selected within the range of important tasks as scheduling priority scheduling objects , you can avoid a \The improved EDF algorithm implemented on ARTs-OS systems , scheduling task set under different loads . From the experimental results it can be seen system to effective scheduling of the tasks in the system under overload conditions critical tasks can guarantee real-time requirements are met first .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer software > Operating system > Real-time operating system
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