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Analysis of window-constrained execution time systems

Patricia Balbastre, Ismael Ripoll, Alfons Crespo
2006 Real-time systems  
Feasibility tests for hard real-time systems provide information about the schedulability of the task set.  ...  The extra time can be determined not only in all the task activations, but in n of a window of m invocations. This is what we call a window-constrained execution time system.  ...  This extra time can be used to re-execute the task in certain faults. Our work has focused on the real-time scheduling theory of window-constrained execution time systems.  ... 
doi:10.1007/s11241-006-9004-z fatcat:cd5a4fwxajgpjioxipqhthby6i

Vulnerability Analysis and Mitigation of Directed Timing Inference Based Attacks on Time-Triggered Systems

Kristin Krüger, Marcus Völp, Gerhard Fohler, Marc Herbstritt
2018 Euromicro Conference on Real-Time Systems  
In this paper, we analyze the severity of these vulnerabilities by assuming successful compromise of a subset of the tasks running in a real-time system and by investigating the attack potential that attackers  ...  ACM Subject Classification Computer systems organization → Real-time systems, Software and its engineering → Scheduling, Security and privacy → Operating systems security Keywords and phrases real-time  ...  Acknowledgements We want to thank the reviewers for their helpful comments which greatly improved this paper. We are also gratefully indebted to Ali Syed, Florian Heilmann and Rodrigo  ... 
doi:10.4230/lipics.ecrts.2018.22 dblp:conf/ecrts/KrugerVF18 fatcat:sxqlxf7p3rcyfhjdxutezg2veq

Generalized Weakly Hard Schedulability Analysis for Real-Time Periodic Tasks

Paolo Pazzaglia, Youcheng Sun, Marco Di Natale
2020 ACM Transactions on Embedded Computing Systems  
The analysis applies to constrained-deadline periodic real-time systems scheduled with fixed priority and no knowledge of the task activation offsets, while allowing for activation jitter.  ...  The weakly hard model allows to constrain the maximum number of acceptable missed deadlines in any set of consecutive task executions.  ...  Schedulability analysis for hard real-time systems has been investigated in the past and solutions exist for many cases of interest.  ... 
doi:10.1145/3404888 fatcat:4mdyfdqpynbsvo7pavnetlhl5i

Energy-constrained scheduling for weakly-hard real-time systems

T.A. AlEnawy, H. Aydin
2005 26th IEEE International Real-Time Systems Symposium (RTSS'05)  
We adopt the weakly-hard realtime scheduling paradigm to ensure a predictable performance for all the tasks: Our aim is to minimize the number of dynamic failures (in terms of (m,k)-firm deadline constraints  ...  In this paper, we explore performance optimization problems for real-time systems that have to rely on a fixed energy budget during an operation/mission.  ...  Figure 1 shows a sample schedule for a (2,3)-firm real-time task over six consecutive periods.  ... 
doi:10.1109/rtss.2005.18 dblp:conf/rtss/AlEnawyA05 fatcat:hofu35gifree7naqep6agaxk6e

Schedulability analysis of DAG tasks with arbitrary deadlines under global fixed-priority scheduling

José Fonseca, Geoffrey Nelissen, Vincent Nélis
2019 Real-time systems  
One of the major sources of pessimism in the response time analysis (RTA) of globally scheduled real-time tasks is the computation of an upper-bound on the inter-task interference.  ...  Abstract One of the major sources of pessimism in the response time analysis (RTA) of globally scheduled real-time tasks is the computation of an upper-bound on the inter-task interference.  ...  Acknowledgements This work was partially supported by National Funds through FCT/ MCTES (Portuguese Foundation for Science and Technology) and co-financed by ERDF (European Regional Development Fund) under  ... 
doi:10.1007/s11241-018-09325-5 fatcat:rzv5ct7njnha3kwjhuqplmifxq

Synchronizing Real-Time Tasks in Time-Triggered Networks

Eleftherios Kyriakakis, Martin Schoeberl, Peter Puschner, Jens Sparsø
2021 Zenodo  
2021 IEEE 24th International Symposium on Real-Time Distributed Computing (ISORC)  ...  and (a) a real-time task scheduler.  ...  This paper investigates the problem of synchronizing the execution of real-time tasks with a time-triggered communication layer.  ... 
doi:10.5281/zenodo.5856419 fatcat:5elbxuhb5jd7powysetve73r24

Research On Weakly Hard Real-Time Constraints And Their Boolean Combination To Support Adaptive Qos

Xiangbin Zhu
2009 Zenodo  
There are two extensions, which are the (m, k)-firm model and Window-Constrained model. This paper researches on weakly hard real-time constraints and their combination to support QoS.  ...  The fact that a practical application can tolerate some violations of temporal constraint under certain distribution is employed to support adaptive QoS on the open real-time system.  ...  For arrival time and execution time of the task in CBS are random, the main thought of weakly hard real-time constant bandwidth server should be the object scheduled by WHRTS, not be the task in CBS.  ... 
doi:10.5281/zenodo.1062111 fatcat:6o7rsqxmgvaavlrpkhlxeg6ta4

A Time-predictable Open-Source TTEthernet End-System

Eleftherios Kyriakakis, Maja Lund, Luca Pezzarossa, Jens Sparsø, Martin Schoeberl
2020 Journal of systems architecture  
For the computation, end-systems need time-predictable processors where the worst-case execution time of the application tasks can be analyzed statically.  ...  The operation of such systems requires coordinated execution of the individual tasks with bounded communication network latency to guarantee quality-of-control.  ...  Acknowledgement This research has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sk ł odowska-Curie grant agreement no. 764785 , FORA -Fog Computing for  ... 
doi:10.1016/j.sysarc.2020.101744 fatcat:zcnixytbgvdqvfgmkul7ctwel4

Guest editorial: Special issue on ECRTS 2008

Alan Burns
2009 Real-time systems  
As a consequence, most embedded systems have requirements to adapt the timing of their response to the changes of their environment, which leads to the need for using real-time techniques and methods in  ...  These systems usually control or monitor artefacts and elements of the outside world that change with time.  ...  The first paper: "An analysis of global EDF schedulability for arbitrary-deadline sporadic task systems" by Baker and Baruah, is concerned with the fundamental question of schedulability for EDF systems  ... 
doi:10.1007/s11241-009-9077-6 fatcat:ilpb4bgsnvgm5phjtis4saqzve

Implementing soft real-time agent control

Régis Vincent, Bryan Horling, Victor Lesser, Thomas Wagner
2001 Proceedings of the fifth international conference on Autonomous agents - AGENTS '01  
, and those which facilitate on-line real-time control, including scheduling flexibility, caching, and windowed commitments.  ...  Two types of enhancements are covered: those which enable planning to meet real-time constraints, such as our task representation, metalevel costing, alternative plan selection, and partial-order scheduling  ...  In a real-time environment, where the agent must constantly reevaluate their execution schedule in the face of varied action characteristics, this sort of control architecture was impractical.  ... 
doi:10.1145/375735.376329 dblp:conf/agents/VincentHLW01 fatcat:36dd3nlsn5gxxkkteihdvvprfm

Hybrid Workflow Scheduling on Edge Cloud Computing Systems

Raed Alsurdeh, Rodrigo N. Calheiros, Kenan M. Matawie, Bahman Javadi
2021 IEEE Access  
We provide a multi-objective optimization model for execution time and monetary cost under constraints of deadline and throughput.  ...  In comparison to a meta-heuristics technique using Particle Swarm Optimization (PSO), the proposed scheduler provides significant improvement for large-scale hybrid workflows in terms of execution time  ...  The technique is not suitable for time-sensitive applications due to the complexity of real-time windows size identification. Deypir et al.  ... 
doi:10.1109/access.2021.3116716 fatcat:4n73d2x7cbdepalalfjugesqbu

Response-time analysis of arbitrarily activated tasks in multiprocessor systems with shared resources

M. Negrean, S. Schliecker, R. Ernst
2009 2009 Design, Automation & Test in Europe Conference & Exhibition  
As multiprocessor systems are increasingly used in real-time environments, scheduling and synchronization analysis of these platforms receive growing attention.  ...  In this paper, we address these constraints and present a general analysis which allows the calculation of response times for fixed priority task sets with arbitrary activations and deadlines in a partitioned  ...  For long, however, real-time analysis has focused on constrained task models -i.e. periodic activation and deadlines not larger than the periods.  ... 
doi:10.1109/date.2009.5090720 dblp:conf/date/NegreanSE09 fatcat:mpdsospdfvdqjlvkaaaapuao3m

A multiprocessor real-time scheduling simulation tool

Arnoldo Diaz-Ramirez, Dulce K. Orduno, Pedro Mejia-Alvarez
2012 CONIELECOMP 2012, 22nd International Conference on Electrical Communications and Computers  
In this paper, we introduce RealtssMP, a tool to perform scheduling analysis and simulation of multiprocessor real-time scheduling algorithms.  ...  One alternative to verify the schedulability of a real-time task set with a larger system utilization on a multiprocessor system, is through the use of exhaustive simulation.  ...  Examples of real-time systems include digital control, command and control, signal processing, and telecommunication systems [26] . A real-time system is comprised of several tasks.  ... 
doi:10.1109/conielecomp.2012.6189901 dblp:conf/conielecomp/Diaz-RamirezVM12 fatcat:qt3hadv7ubenzaiz3igdhg5cp4

From Dataflow Specification to Multiprocessor Partitioned Time-triggered Real-time Implementation

Thomas Carle, Dumitru Potop-Butucaru, Yves Sorel, David Lesens
2013 Leibniz Transactions on Embedded Systems  
Then, we provide novel algorithms for the off-line scheduling of these extended specifications onto partitioned time-triggered architectures à la ARINC 653.  ...  Allocation of time slots/windows to partitions can be fully or partially provided, or synthesized by our tool.  ...  Compared to classical work on the on-line real-time scheduling of tasks with execution modes (cf.  ... 
doi:10.4230/lites-v002-i002-a001 dblp:journals/lites/CarlePSL15 fatcat:7c2bz23n7rg6nguukkfatyhqpy

Decentralized multi-robot allocation of tasks with temporal and precedence constraints

Ernesto Nunes, Mitchell McIntire, Maria Gini
2017 Advanced Robotics  
In our approach each robot owns its schedule for the subset of tasks assigned to it. A schedule is represented as a simple temporal network (STN) [4] , which stores the execution times of the tasks.  ...  Temporal constraints are expressed as time windows, within which a task must be executed.  ...  After the tasks are allocated, when the start time arrives robots execute the tasks in their schedules in real time in ROS/Gazebo.  ... 
doi:10.1080/01691864.2017.1396922 fatcat:nvbk2pv4dve67bsaeywxoynpm4
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