Resource Access Control In Rt Linux And Energy Aware Real Time Scheduling
DOWNLOAD
Download Resource Access Control In Rt Linux And Energy Aware Real Time Scheduling PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Resource Access Control In Rt Linux And Energy Aware Real Time Scheduling book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Resource Access Control In Rt Linux And Energy Aware Real Time Scheduling
DOWNLOAD
Author : Guang Xie
language : en
Publisher:
Release Date : 2003
Resource Access Control In Rt Linux And Energy Aware Real Time Scheduling written by Guang Xie and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
General-purpose operating systems, like Linux, Windows NT, optimize average performance and try to give every process a fair share of compute time. But the goal of real-time operating system (RTOS) is to guarantee precise timing and predictable performance rather than average performance. Nowadays several RTOS are being developed by different research groups to make the free Linux a viable platform to support real-time requirements while retaining its general-purpose features. But the existing RT-Linux versions provide limited resource access control support, which is necessary to prevent priority inversion and deadlock. In this thesis, we modify FSMLabs' RTLinux, which provides a loadable scheduler for fixed priority-driven scheduler, to accommodate two popular resource access control protocols, namely, Priority Inheritance and Priority Ceiling Protocols. We make suitable modifications in APIs to support these protocols while still maintaining backward compatibility. A last-in-first-out (LIFO) queue is introduced to simplify the implementation of Priority Ceiling Protocol. We have also developed a graphical simulation tool of the schedulers. Finally, we use several examples to test and verify the implementation. Power efficiency is a very important aspect in embedded systems, many of which have real-time requirements. Based on the characteristic of the prevailing CMOS process, Real-time Dynamic Voltage Scaling (RT-DVS) can dramatically reduce the energy dissipation by dynamically lowering the supply voltage and execution frequency, while still meeting tasks' deadlines. By carefully studying the behavior of the optimal execution curve of the stochastic execution time task set, we propose a new RT-DVS algorithm, which can acquire a near-optimal performance and when the variance of computation time of tasks approaches zero, the average energy dissipation converges to the optimum.
Energy Aware Operating System Design
DOWNLOAD
Author : Padmanabhan Pillai
language : en
Publisher:
Release Date : 2004
Energy Aware Operating System Design written by Padmanabhan Pillai and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Energy Aware Scheduling For Real Time Embedded Systems
DOWNLOAD
Author : Muhammad Khurram Bhatti
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2012-04
Energy Aware Scheduling For Real Time Embedded Systems written by Muhammad Khurram Bhatti and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-04 with categories.
Real-time embedded systems have become ubiquitous in our daily life. Due to their diversified usage, the research on these systems has confronted with many emerging challenges. One such challenge is to reduce power and energy consumption while maintaining assurance that timing constraints will be met. Power densities in microprocessors are almost doubled every three years. As energy is power integrated over time, supplying the required energy may become prohibitively expensive, or even technologically infeasible. This is particularly difficult in portable systems that heavily rely on batteries for energy, and will become even more critical as battery capacities are increasing at a much slower rate than power consumption. This book presents four contributions that are based on the thesis that energy-efficiency of Real-time Embedded Systems and scheduling are closely related problems and therefore, should be tackled together for optimal results. Contributions of this book are: 1) Two-level Hierarchical Scheduling Algorithm for Multiprocessor Systems, 2) Assertive Dynamic Power Management Scheme, 3) Deterministic Stretch-to-Fit DVFS Technique, and 4) Hybrid Power Management Scheme.
Energy Aware Real Time Scheduling On Heterogeneous And Homogeneous Platforms In The Era Of Parallel Computing
DOWNLOAD
Author : Ashik Ahmed Bhuiyan
language : en
Publisher:
Release Date : 2021
Energy Aware Real Time Scheduling On Heterogeneous And Homogeneous Platforms In The Era Of Parallel Computing written by Ashik Ahmed Bhuiyan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Multi-core processors increasingly appear as an enabling platform for embedded systems, e.g., mobile phones, tablets, computerized numerical controls, etc. The parallel task model, where a task can execute on multiple cores simultaneously, can efficiently exploit the multi-core platform’s computational ability. Many computation-intensive systems (e.g., self-driving cars) that demand stringent timing requirements often evolve in the form of parallel tasks. Several real-time embedded system applications demand predictable timing behavior and satisfy other system constraints, such as energy consumption.
Real Time Task Scheduling For Energy Aware Embedded Systems
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2005
Real Time Task Scheduling For Energy Aware Embedded Systems written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
We present a new approach for scheduling workloads containing periodic tasks in real-time systems. The proposed approach minimizes the total energy consumed by the task set and guarantees that the deadline for every periodic task is met. As embedded software becomes a larger component of system-on-a-chip design, energy management using the operating system becomes increasingly important. We present a mixed-integer linear programming model for the NP-complete scheduling problem and solve it for moderate-sized problem instances using a public-domain solver. For larger task sets, we present a novel low-energy earliest-deadline-first (LEDF) scheduling algorithm and apply it to two real-life task sets.
Power And Thermal Aware Scheduling For Real Time Computing Systems
DOWNLOAD
Author : Huang Huang
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2013
Power And Thermal Aware Scheduling For Real Time Computing Systems written by Huang Huang and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
We have been enjoying tremendous benefits thanks to the revolutionary advancement of computing systems, driven by the remarkable semiconductor technology scaling and the advanced processor architecture. However, the exponentially increased transistor density has directly led to increased power consumption and elevated system temperature. The power and thermal issues have posed enormous challenges and threaten to slow down the continuous evolvement of computer technology. Effective power/thermal-aware design techniques are urgently demanded at all design abstraction levels. In this book, we present our research efforts to employ real-time scheduling techniques to solve the resource-constrained power/thermal-aware, design-optimization problems. The novelty of this work is that we integrate the cutting-edge research on power and thermal at the circuit and architectural-level into a set of accurate yet simplified system-level models, and are able to conduct system-level analysis and design based on these models. The theoretical study in this work serves as a solid foundation for the guidance of the power/thermal-aware scheduling algorithms development in practical computing systems.
Systems Aspects In Organic And Pervasive Computing Arcs 2005
DOWNLOAD
Author : Michael Beigl
language : en
Publisher: Springer
Release Date : 2005-03-01
Systems Aspects In Organic And Pervasive Computing Arcs 2005 written by Michael Beigl and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-03-01 with Computers categories.
This book constitutes the refereed proceedings of the 18th International Conference on Architecture of Computing Systems, ARCS 2005, held in Innsbruck, Austria in March 2005. The 18 revised full papers presented were carefully reviewed and selected from 52 submissions. The papers are organized in topical sections on adaptation, power consumption, and scheduling; adaptation and agents; adaptation and services; application of adaptable systems; and pervasive computing and communication.
Operating System Services For Task Specific Power Management Novel Approaches To Energy Aware Embedded Linux
DOWNLOAD
Author : Andreas Weifel
language : en
Publisher: VDM Publishing
Release Date : 2007
Operating System Services For Task Specific Power Management Novel Approaches To Energy Aware Embedded Linux written by Andreas Weifel and has been published by VDM Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Computers categories.
Mobile computing devices like PDAs, cell phones or laptops have become an indispensable part of everyday's life. As these systems are battery-powered and the user expects long operating times, energy-aware operation is crucial. Hardware components for mobile devices offer low-power operating modes that achieve energy savings at the cost of degraded performance or application quality, e.g., by reducing the CPU speed. This dissertation investigates software-controlled energy management and addresses these two, often conflicting goals: increasing the embedded system's runtime by saving energy and providing sufficient application quality. With a cooperative approach between the operating system and individual applications or the user, task-specific trade-offs between these goals can be made. Prototype implementations for embedded Linux are presented and evaluated with energy measurements, proving the feasibility of task-specific power management. This dissertation has a strong practical focus, being a valuable guide for computer scientists and software engineers both in academia and industry who deal with operating system design and low-power software architectures.
Configuration Aware And Qos Aware Task Scheduling In Real Time Adaptive Embedded Systems
DOWNLOAD
Author : Hessam Kooti
language : en
Publisher:
Release Date : 2012
Configuration Aware And Qos Aware Task Scheduling In Real Time Adaptive Embedded Systems written by Hessam Kooti and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
In order to cope with increase in demand for embedded applications under resource and power constraints, there is an increasing trend on incorporating system-level flexibility and runtime adaptation in embedded systems. Although a complete processor-based implementation provides ultimate flexibility, usually computationally intensive processing mandates hardware support in addition to the processors. However, the main drawback of reconfigurable hardware platform is delay and energy overhead during system reconfiguration. Ignoring the time and energy required for reconfiguration may lead to performance degradation and deadline misses. In this thesis we provide different real-time scheduling techniques. First, we propose the first real-time scheduler that is aware of the transition time overhead due to configuration of underlying hardware. We consider a heterogeneous multi-processor system and there are data dependencies among tasks and communication overhead time during task execution. In many applications deadline miss rate is not an accurate metric to model the application quality but the distribution of deadline misses is the main factor. We use a well-known Weakly Hard System QoS model to define the acceptable deadline miss distribution. We provide an online scheduler that considers the time overheads among task switching while the deadline misses caused by time overheads follow a predefined pattern. Next, we focus on energy consumption of the system and provide a scheduler that considers the time and energy overhead during power management. In our work deadline miss rate is minimized as the primary objective and the energy consumption of the system is minimized by means of voltage scaling as the secondary objective. Many adaptive systems need to adapt to varying delay and/or energy constraints such as fluctuation of energy source when system is powered by renewable energies like solar energy. In order to ensure the scheduler can handle the dynamicity in availability of the energy source, we exploit the QoS constraint so the application quality is not violated during job dropout when our power management scheme adjusts the energy consumption according to energy availability. Each of these schedulers is accompanied by an extensive experimental evaluation that represents the effect of using the proposed algorithms.
Conference Proceedings Of The 2002 International Conference On Supercomputing
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2002
Conference Proceedings Of The 2002 International Conference On Supercomputing written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Supercomputers categories.