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The advancements in distributed computing have driven the emergence of Service Oriented infrastructures that allow for on-demand provision of ICT assets. Taking into consideration the complexity of distributed environments, significant challenges exist in providing and managing the offered on-demand resources with the required level of Quality of Service (QoS), especially for real-time interactive...
We present an approach for scheduling of fault-tolerant embedded applications composed of soft and hard real-time processes running on distributed embedded systems. The hard processes are critical and must always complete on time. A soft process can complete after its deadline and its completion time is associated with a value function that characterizes its contribution to the quality-of-service...
The advancements in distributed computing have driven the emergence of service-based infrastructures that allow for on-demand provision of ICT assets. Taking into consideration the complexity of distributed environments, significant challenges exist in providing and managing the offered on-demand resources with the required level of Quality of Service (QoS), especially for real-time interactive multimedia...
This paper presents a new method to improve the quality of man machine communication in distributed systems and networks, in which a significant portion of traffic is multimedia traffic. Method is to use a soft short packets and packet multimedia services. Justified the choice of service time as a parameter evaluating the effectiveness of proposed solutions and an appropriate mathematical model. Using...
In packet based communication networks, loss bound is a significant parameter in Quality of Service(QoS) guarantees, especially in real-time distributed applications. Unfortunately, most approaches presenting loss problem are based on the approximates of the buffer overflow probability, which have been shown incorrect in most of time. Recently, network calculus has been widely used to obtain the performance...
Current generation of distributed real-time systems requires more flexibility and the ability of changing its behaviour at run time. This paper presents a model and an algorithm for QoS-aware service composition in distributed systems with real-time requirements. This model is applicable in application domains where temporal guarantees and flexibility are needed, such as remote monitoring, control...
Many real-time applications and data services in distributed environments need to operate on continuous unbounded data streams with the development of large wired and wireless sensor network. Conventional one-time queries cannot be suitable to provide continues results as data and update stream into the system, and continuous queries represent a new paradigm for interacting with dynamically changing...
The Distributed Real-Time Thread is an emergent concept for distributed real-time systems. Distributed Threads are schedulable entities with an end-to-end deadline that transpose nodes, carrying their scheduling context. Mechanisms for predicting the missing of deadlines are fundamental because corrective actions can be incorporated for improving system quality of service. In this work we propose...
Multiple performance guarantees are increasingly needed in QoS-aware real-time applications. Unfortunately, most traditional scheduling algorithms only consider one or two dimensions of them. In this paper, we build a new scheduler model that is suitable for providing multiple services. Based on the scheduler mode, we propose a novel multi-dimensional scheduling scheme MDSS, which tasks timing constraints,...
Many real-time systems must control their CPU utilizations in order to meet end-to-end deadlines and prevent overload. Utilization control is particularly challenging in distributed real-time systems with highly unpredictable workloads and a large number of end-to-end tasks and processors. This paper presents the decentralized end-to-end utilization control (DEUCON) algorithm, which can dynamically...
Dynamic, distributed, real-time control systems must control changing environments in a timely manner despite the fact that the system's load and timing vary in a way that is not characterizable by time-invariant statistical distributions. A quality of service (QoS) manager has been implemented that forecasts timing constraint violations in such systems and corrects them before they occur. The majority...
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