Mixing scheduling method suitable for real-time system periodic tasks

A periodic task and mixed scheduling technology, applied in the direction of multi-programming devices, etc., can solve problems that affect system performance, tasks miss deadlines, etc.

Inactive Publication Date: 2014-05-21
中国科学院沈阳计算技术研究所有限公司
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Problems solved by technology

[0004] Existing algorithms for scheduling hard real-time periodic tasks only use the RM algorithm or the EDF algorithm alone. When the system load is low, using the RM al

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  • Mixing scheduling method suitable for real-time system periodic tasks
  • Mixing scheduling method suitable for real-time system periodic tasks
  • Mixing scheduling method suitable for real-time system periodic tasks

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Embodiment Construction

[0025] The solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] See attached figure 1 , is a hybrid scheduling method suitable for real-time system periodic tasks, characterized in that: comprising the following steps:

[0027] Find the ready task set T, sort the tasks in the task set T in ascending order according to the deadline D, and find the task with the shortest deadline;

[0028] The execution time C and deadline D of the task with the shortest deadline are used as the input data of the fuzzy reasoning system;

[0029] Using the fuzzy inference system to process the above input data, that is, to map the output threshold δ of the fuzzy inference system to its membership function, and determine the attribute of the threshold δ according to its membership function;

[0030] Judging the attribute of the threshold δ output by the fuzzy reasoning system, if the attribute of the t...

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Abstract

The invention discloses a mixing scheduling method suitable for real-time system periodic tasks. The method comprises the following steps: searching a ready real-time system task set T and sorting the tasks in an ascending order according to deadlines; finding the task with the shortest deadline, wherein the execution time C and the deadline D of the task with the shortest deadline are taken as input data of a fuzzy reasoning system; processing the input data by a CPU (central processing unit), i.e. mapping a threshold value delta output by the fuzzy reasoning system onto a membership function of the threshold value, and determining the property of the threshold value delta according to the membership function. The mixing scheduling method uses a fuzzy system theory to organically combine an RM (rate monotonic) algorithm and an EDF (earliest deadline first) algorithm for scheduling the execution tasks, so the deadlines of the tasks cannot be missed, and system resources are fully utilized.

Description

technical field [0001] The invention relates to real-time scheduling of tasks in the field of real-time systems, in particular to a hybrid scheduling method suitable for periodical tasks of real-time systems. Background technique [0002] A real-time system refers to a computer system that can respond to external random events and complete event processing within a specified time. To be precise: its correctness depends not only on the logical results of calculations, but also on the time when the results are generated. It has a wide range of applications in aviation, aerospace, communications, industrial automation and other fields, such as numerical control systems, embedded real-time systems, etc. According to whether the task can miss the deadline, it is divided into hard real-time system and soft real-time system. Hard real-time systems do not allow tasks to miss deadlines, otherwise there will be serious consequences; soft real-time systems have no deadline restriction...

Claims

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Application Information

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IPC IPC(8): G06F9/46
Inventor 张忆文郭锐锋刘娴王鸿亮
Owner 中国科学院沈阳计算技术研究所有限公司
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