Optimization of Fault-Tolerant Mixed-Criticality Multi-Core Systems with Enhanced WCRT Analysis

2019 ◽  
Vol 24 (1) ◽  
pp. 1-26
Author(s):  
Junchul Choi ◽  
Hoeseok Yang ◽  
Soonhoi Ha
Keyword(s):  
Fault Tolerant ◽  
Mixed Criticality

Scheduling Mixed-Criticality Real-Time Tasks in a Fault-Tolerant System

2015 ◽  
Vol 6 (2) ◽  
pp. 65-86 ◽  
Author(s):  
Jian (Denny) Lin ◽  
Albert M. K. Cheng ◽  
Doug Steel ◽  
Michael Yu-Chi Wu ◽  
Nanfei Sun
Keyword(s):  
Real Time ◽  
Fault Tolerant ◽  
Formal Proof ◽  
Worst Case ◽  
Real Time Scheduling ◽  
Important Trend ◽  
Time Scheduling ◽  
On Line ◽  
Computer Tasks ◽  
Mixed Criticality

Enabling computer tasks with different levels of criticality running on a common hardware platform has been an increasingly important trend in the design of real-time and embedded systems. On such systems, a real-time task may exhibit different WCETs (Worst Case Execution Times) in different criticality modes. It is well-known that traditional real-time scheduling methods are not applicable to ensure the timely requirement of the mixed-criticality tasks. In this paper, the authors study a problem of scheduling real-time, mixed-criticality tasks with fault tolerance. An optimal, off-line algorithm is designed to guarantee the most tasks completing successfully when the system runs into the high-criticality mode. A formal proof of the optimality is given. Also, a novel on-line slack-reclaiming algorithm is proposed to recover from computing faults before the tasks' deadline during the run-time. Simulations show that an improvement of about 30% in performance is obtained by using the slack-reclaiming method.

Fault-Tolerant Task Scheduling for Mixed-Criticality Real-Time Systems

2016 ◽  
Vol 26 (01) ◽  
pp. 1750016 ◽  
Author(s):  
Junlong Zhou ◽  
Min Yin ◽  
Zhifang Li ◽  
Kun Cao ◽  
Jianming Yan ◽  
...  
Keyword(s):  
Real Time ◽  
Fault Tolerant ◽  
Transient Faults ◽  
Worst Case ◽  
Worst Case Execution Time ◽  
Time Systems ◽  
Certification Requirements ◽  
Different Levels ◽  
Mixed Criticality

Integration of safety-critical tasks with different certification requirements onto a common hardware platform has become a growing tendency in the design of real-time and embedded systems. In the past decade, great efforts have been made to develop techniques for handling uncertainties in task worst-case execution time, quality-of-service, and schedulability of mixed-criticality systems. However, few works take fault-tolerance as a design requirement. In this paper, we address the scheduling of fault-tolerant mixed-criticality systems to ensure the safety of tasks at different levels of criticalities in the presence of transient faults. We adopt task re-execution as the fault-tolerant technique. Extensive simulations were performed to validate the effectiveness of our algorithm. Simulation results show that our algorithm results in up to [Formula: see text] and [Formula: see text] improvement in system reliability and schedule feasibility as compared to existing techniques, which contributes to a more safe system.

Lifetime-aware real-time task scheduling on fault-tolerant mixed-criticality embedded systems

2019 ◽  
Vol 100 ◽  
pp. 165-175 ◽  
Author(s):  
Kun Cao ◽  
Guo Xu ◽  
Junlong Zhou ◽  
Mingsong Chen ◽  
Tongquan Wei ◽  
...  
Keyword(s):  
Embedded Systems ◽  
Real Time ◽  
Task Scheduling ◽  
Fault Tolerant ◽  
Time Task ◽  
Mixed Criticality
Sign in / Sign up

Export Citation Format

Share Document