Worst-Case Temperature Guarantees for Real-Time Applications on Multi-core Systems

2012 ◽  
Author(s):  
Lars Schor ◽  
Iuliana Bacivarov ◽  
Hoeseok Yang ◽  
Lothar Thiele
Keyword(s):  
Real Time ◽  
Worst Case ◽  
Real Time Applications

scholarly journals Efficient Worst-Case Temperature Evaluation for Thermal-Aware Assignment of Real-Time Applications on MPSoCs

2013 ◽  
Vol 29 (4) ◽  
pp. 521-535 ◽  
Author(s):  
Lars Schor ◽  
Iuliana Bacivarov ◽  
Hoeseok Yang ◽  
Lothar Thiele
Keyword(s):  
Real Time ◽  
Worst Case ◽  
Real Time Applications

Novel prioritized LRU circuits for shared cache in computer systems

2020 ◽  
Vol 34 (23) ◽  
pp. 2050242
Author(s):  
Yao Wang ◽  
Lijun Sun ◽  
Haibo Wang ◽  
Lavanya Gopalakrishnan ◽  
Ronald Eaton
Keyword(s):  
Real Time ◽  
High Performance ◽  
Cmos Technology ◽  
Cache Replacement ◽  
Worst Case ◽  
Shared Cache ◽  
Cache Access ◽  
Worst Case Execution Time ◽  
Real Time Applications ◽  
Time Systems

Cache sharing technique is critical in multi-core and multi-threading systems. It potentially delays the execution of real-time applications and makes the prediction of the worst-case execution time (WCET) of real-time applications more challenging. Prioritized cache has been demonstrated as a promising approach to address this challenge. Instead of the conventional prioritized cache schemes realized at the architecture level by using cache controllers, this work presents two prioritized least recently used (LRU) cache replacement circuits that directly accomplish the prioritization inside the cache circuits, hence significantly reduces the cache access latency. The performance, hardware and power overheads due to the proposed prioritized LRU circuits are investigated based on a 65 nm CMOS technology. It shows that the proposed circuits have very low overhead compared to conventional cache circuits. The presented techniques will lead to more effective prioritized shared cache implementations and benefit the development of high-performance real-time systems.

scholarly journals Real-Time Performance and Response Latency Measurements of Linux Kernels on Single-Board Computers

Computers ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 64
Author(s):  
George K. Adam
Keyword(s):  
Real Time ◽  
Safety Margin ◽  
Evaluation Methodology ◽  
Raspberry Pi ◽  
Performance Measurements ◽  
Worst Case ◽  
Time Performance ◽  
Software Modules ◽  
Real Time Applications ◽  
Embedded Development

This research performs real-time measurements of Linux kernels with real-time support provided by the PREEMPT_RT patch on embedded development devices such as BeagleBoard and Raspberry Pi. The experimental measurements of the Linux real-time performance on these devices are based on real-time software modules developed specifically for the purposes of this research. Taking in consideration the constraints of the specific hardware platforms under investigation, new measurements software was developed. The measurement algorithms are designed upon response and periodic task models. Measurements investigate latencies of real-time applications at user and kernel space. An outcome of this research is that the proposed performance measurements approach and evaluation methodology could be applied and deployed on other Linux-based boards and platforms. Furthermore, the results demonstrate that the PREEMPT_RT patch overall improves the Linux kernel real-time performance compared to the standard one. The reduced worst-case latencies on such devices running Linux with real-time support could make them potentially more suitable for real-time applications as long as a latency value of about 160 μs, as an upper bound, is an acceptable safety margin.

scholarly journals Beyond the Traditional Analyses and Resource Management in Real-Time Systems

2022 ◽  
pp. 67-77
Author(s):  
Federico Reghenzani
Keyword(s):  
Real Time ◽  
Real Time Systems ◽  
Formal Proofs ◽  
Worst Case ◽  
Worst Case Execution Time ◽  
Quantitative Results ◽  
Real Time Applications ◽  
Hard Real Time ◽  
Phd Thesis ◽  
Time Systems

AbstractThe difficulties in estimating the Worst-Case Execution Time (WCET) of applications make the use of modern computing architectures limited in real-time systems. Critical embedded systems require the tasks of hard real-time applications to meet their deadlines, and formal proofs on the validity of this condition are usually required by certification authorities. In the last decade, researchers proposed the use of probabilistic measurement-based methods to estimate the WCET instead of traditional static methods. In this chapter, we summarize recent theoretical and quantitative results on the use of probabilistic approaches to estimate the WCET presented in the PhD thesis of the author, including possible exploitation scenarios, open challenges, and future directions.

On the use of static branch prediction to reduce the worst-case execution time of real-time applications

2018 ◽  
Vol 54 (3) ◽  
pp. 537-561 ◽  
Author(s):  
Andreu Carminati ◽  
Renan Augusto Starke ◽  
Rômulo Silva de Oliveira
Keyword(s):  
Real Time ◽  
Execution Time ◽  
Branch Prediction ◽  
Worst Case ◽  
Worst Case Execution Time ◽  
Real Time Applications

A DEVELOPMENT ENVIRONMENT FOR HARD REAL-TIME APPLICATIONS

1996 ◽  
Vol 06 (03) ◽  
pp. 331-354 ◽  
Author(s):  
PAOLO ANCILOTTI ◽  
GIORGIO BUTTAZZO ◽  
MARCO DI NATALE ◽  
MARCO SPURI
Keyword(s):  
Real Time ◽  
Design Tool ◽  
Component Level ◽  
Development Environment ◽  
Worst Case ◽  
The Real ◽  
Real Time Scheduling ◽  
Time Scheduling ◽  
Real Time Applications ◽  
Hard Real Time

In this paper, we describe an integrated environment to assist the development of hard real-time applications. It includes an interactive graphic interface which allows the user to describe the application requirements according to three hierarchical levels: the application level, the component level, and the object level. The development model we propose is based on an iterative process in which the real-time scheduling support is considered since the beginning of the design phases. Our graphic environment integrates several tools to analyse, test, and simulate the real-time application under development. In particular, the tools we have implemented are: a Design Tool, to describe the structure of the application, a Schedulability Analyser Tool (SAT), to verify off-line the feasibility of the schedule of a critical task set, a Scheduling Simulator, to test the average behaviour of the application, and a Maximum Execution Time (MET) estimator to bound the worst case duration of each task.

Maintaining Consistency Over A Network in Real-Time Applications

1989 ◽  
Author(s):  
Insup Lee ◽  
Susan Davidson ◽  
Victor Wolfe
Keyword(s):  
Real Time ◽  
Real Time Applications
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