Energy-Efficient Task Scheduling and Task Energy Consumption Analysis for Real-Time Embedded Systems

2014 ◽  
Author(s):  
Yongqi Ge ◽  
Yunwei Dong ◽  
Hongbing Zhao
Keyword(s):  
Energy Consumption ◽  
Embedded Systems ◽  
Real Time ◽  
Task Scheduling ◽  
Energy Efficient ◽  
Energy Consumption Analysis ◽  
And Task

scholarly journals A Group-Based Energy-Efficient Dual Priority Scheduling for Real-Time Embedded Systems

Information ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 191
Author(s):  
Yongqi Ge ◽  
Rui Liu
Keyword(s):  
Energy Consumption ◽  
Embedded Systems ◽  
Real Time ◽  
System Reliability ◽  
Energy Efficient ◽  
Worst Case ◽  
Priority Scheduling ◽  
Different Types ◽  
Time Overhead ◽  
Case Response

As the limitation of energy consumption of real-time embedded systems becomes more and more strict, it has been difficult to ignore the time overhead and energy consumption of context switches for fixed-priority tasks with preemption scheduling (FPP) in multitasking environments. In addition, the scheduling for different types of tasks may disrupt each other and affect system reliability. A group-based energy-efficient dual priority scheduling (GEDP) is proposed in this paper. The GEDP isolates different types of tasks to avoid the disruption. Furthermore, it also reduces context switches effectively, thus decreasing system energy consumption. As many studies ignored the context switches’ overhead in the worst-case response time (WCRT) model, and it will affect the accuracy of WCRT, thereby affecting the system schedulability. Consequently, the WCRT model is improved based on considering context switches’ overhead. The GEDP is designed and implemented in Linux, and the time overhead and energy consumption of context switches is compared in different situations with GEDP and FPP. The experimental results show that GEDP can reduce context switches by about 1% and decrease energy consumption by about 0.6% for given tasks.

Task Scheduling under Uncertain Timing Constraints in Real-Time Embedded Systems

2013 ◽  
pp. 211-235 ◽  
Author(s):  
Pranab K. Muhuri ◽  
K. K. Shukla
Keyword(s):  
Embedded Systems ◽  
Real Time ◽  
Task Scheduling ◽  
Resource Constraints ◽  
Systems Design ◽  
Task Completion ◽  
Timing Constraints ◽  
Timing Constraint ◽  
Processing Times ◽  
And Task

In real-time embedded systems, timeliness of task completion is a very important factor. In such systems, correctness of the output depends on the timely production of results in addition to the logical outcome of computation. Thus, tasks have explicit timing constraints besides other characteristics of general systems, and task scheduling aims towards devising a feasible schedule of the tasks such that timing constraints, resource constraints, precedence constraints, etc. are complied. In real-time embedded systems, the most important timing constraint of a task is the deadline, as tasks must be completed within this time. The next important timing constraint is the processing time, because a task occupies a processor only for this duration of time. However, in the early phase of real-time embedded systems design only an approximate idea of the tasks and their characteristics are known. As a result, uncertainty or impreciseness is associated with the task deadlines and processing times; hence, it is appropriate to use fuzzy numbers to model deadlines and processing times in real-time embedded systems. The chapter introduces a new method using mixed cubic-exponential Hermite interpolation technique for intuitively defining smooth Membership Functions (MFs) for fuzzy deadlines and processing times. The effect of changes in parameterized MFs on the task schedulability and task priorities are explained. Examples are given to demonstrate the significant features and better performance of the new technique.

Energy Efficient Real-Time Task Scheduling for Embedded Systems with Hybrid Main Memory

2015 ◽  
Vol 84 (1) ◽  
pp. 69-89 ◽  
Author(s):  
Zhiyong Zhang ◽  
Zhiping Jia ◽  
Peng Liu ◽  
Lei Ju
Keyword(s):  
Embedded Systems ◽  
Real Time ◽  
Task Scheduling ◽  
Energy Efficient ◽  
Main Memory ◽  
Time Task

Requirements for Static Task Scheduling in Real Time Embedded Systems

2001 ◽  
pp. 35-44
Author(s):  
Chun Wong ◽  
Filip Thoen ◽  
Francky Catthoor ◽  
Diederik Verkest
Keyword(s):  
Embedded Systems ◽  
Real Time ◽  
Task Scheduling

Designing energy-efficient NoC for real-time embedded systems through slack optimization

2013 ◽  
Author(s):  
Jia Zhan ◽  
Nikolay Stoimenov ◽  
Jin Ouyang ◽  
Lothar Thiele ◽  
Vijaykrishnan Narayanan ◽  
...  
Keyword(s):  
Embedded Systems ◽  
Real Time ◽  
Energy Efficient
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