Ensuring Real-Time Performance Guarantees in Dynamically Reconfigurable Embedded Systems

2005 ◽  
pp. 131-141 ◽  
Author(s):  
Aleksandra Tešanović ◽  
Mehdi Amirijoo ◽  
Daniel Nilsson ◽  
Henrik Norin ◽  
Jörgen Hansson
Keyword(s):  
Embedded Systems ◽  
Real Time ◽  
Dynamically Reconfigurable ◽  
Time Performance ◽  
Performance Guarantees

scholarly journals Hierarchical Scheduling for Real-Time Periodic Tasks in Symmetric Multiprocessing

2021 ◽  
Author(s):  
Tom Springer ◽  
Peiyi Zhao
Keyword(s):  
Real Time ◽  
Response Times ◽  
Periodic Tasks ◽  
Global Scheduling ◽  
Hierarchical Scheduling ◽  
Time Performance ◽  
Performance Guarantees ◽  
Partitioned Scheduling ◽  
Hard Real Time ◽  
Time Periodic

In this paper, we present a new hierarchical scheduling framework for periodic tasks in symmetric multiprocessor (SMP) platforms. Partitioned and global scheduling are the two main approaches used by SMP based systems where global scheduling is recommended for overall performance and partitioned scheduling is recommended for hard real-time performance. Our approach combines both the global and partitioned approaches of traditional SMP-based schedulers to provide hard real-time performance guarantees for critical tasks and improved response times for soft real-time tasks. Implemented as part of VxWorks, the results are confirmed using a real-time benchmark application, where response times were improved for soft real-time tasks while still providing hard real-time performance.

scholarly journals Research on Embedded Multi-task Balancing Scheduling Algorithm

2018 ◽  
Vol 176 ◽  
pp. 01025
Author(s):  
Han Zhuangzhi ◽  
Ma Tianlin
Keyword(s):  
Operating System ◽  
Embedded Systems ◽  
Embedded System ◽  
Real Time ◽  
Scheduling Algorithm ◽  
Task Decomposition ◽  
The Real ◽  
Time Performance ◽  
The Embedded System ◽  
And Task

For embedded systems, there are two cases of using an operating system and not using an operating system. When the real-time task is accomplished by the embedded system of the operating system, the task needs to meet certain conditions and occupy part of the processor's resources. Therefore, based on the method of event interruption, timed interruption and task decomposition, the real-time performance of the completion of the task of the embedded system is achieved. Finally, an embedded radar track compression scheduling algorithm is designed. It is proved through experiment that the track data can be compressed and transmitted in real time.

scholarly journals A Novel Time Synchronization Method for Dynamic Reconfigurable Bus

VLSI Design ◽  
2016 ◽  
Vol 2016 ◽  
pp. 1-10
Author(s):  
Zhang Weigong ◽  
Li Chao ◽  
Qiu Keni ◽  
Zhang Shaonan ◽  
Chen Xianglong
Keyword(s):  
Fault Tolerance ◽  
Embedded Systems ◽  
Real Time ◽  
High Speed ◽  
Time Synchronization ◽  
Experimental Results ◽  
Channel Detection ◽  
Dynamically Reconfigurable ◽  
Synchronization Method ◽  
Synchronization Problem

UM-BUS is a novel dynamically reconfigurable high-speed serial bus for embedded systems. It can achieve fault tolerance by detecting the channel status in real time and reconfigure dynamically at run-time. The bus supports direct interconnections between up to eight master nodes and multiple slave nodes. In order to solve the time synchronization problem among master nodes, this paper proposes a novel time synchronization method, which can meet the requirement of time precision in UM-BUS. In this proposed method, time is firstly broadcasted through time broadcast packets. Then, the transmission delay and time deviations via three handshakes during link self-checking and channel detection can be worked out referring to the IEEE 1588 protocol. Thereby, each node calibrates its own time according to the broadcasted time. The proposed method has been proved to meet the requirement of real-time time synchronization. The experimental results show that the synchronous precision can achieve a bias less than 20 ns.

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