Energy consumption optimization method for fixed-priority periodic tasks in mixed-critical systems

Abstract

The invention relates to a method for optimizing energy consumption of fixed-priority periodic tasks in a mixed critical system, comprising the following steps: establishing a mixed critical periodic task model including several mixed critical periodic tasks; using a key hierarchy division method to determine the priority of the mixed critical periodic tasks ;Calculate the minimum speed S of the feasible scheduling of mixed critical period tasks; calculate the idle time ST generated by high critical level tasks in low mode, and use this idle time to determine the execution speed S of the processor i ;Low critical level tasks and high critical level tasks are always at speed S in low mode i Execution; high-level critical tasks are executed at maximum processor speed with their additional load in high mode; use dynamic power management technology to reduce processor power consumption. The method of the invention effectively reduces system energy consumption by utilizing the idle time generated by the high-level critical level task and the dynamic power consumption management technology.

Description

technical field [0001] The invention relates to low-energy real-time scheduling of a hybrid critical system, in particular to a method for optimizing energy consumption of a fixed-priority periodic task in a hybrid critical system. Background technique [0002] A hybrid critical system refers to an embedded real-time system that performs multiple functions on the same platform and meets the constraints of power consumption, cost, and volume. Mixed critical systems can perform functions at different critical levels. These functions can be broadly categorized into safety-critical functions and mission-critical functions. An example of a mixed-critical system is a drone, where trajectory calculation and flight control functions are considered safety-critical, while object tracking for surveillance purposes is considered mission-critical. Because the system is limited by weight and volume, and powered by batteries, coupled with the rapid development of processor technology, en...

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Problems solved by technology

[0003] At present, the research on hybrid critical systems mainly focuses on the feasibility analysis of the system. There are relatively few studies on the energy consumption of hybrid critical systems. The only few studies mainly use dynamic priority policy scheduling systems, which cannot be applied to fixed Scheduling systems with high-level strategies, and the energy consumption of these researches is high

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