Performance Analysis of Soft Real-Time Systems
نویسندگان
چکیده
We model a gracefully degrading mul-tiprocessor soft real-time system which is subject to both dynamic (software) and static (hardware) failures, without recovery, using a Markov process. We derive the traditional reliability performance measure and meantime to failure (MTTF) of such a system with respect to both failure types and introduce a parameter, expected-deadline-missed, which is the expected number of tasks that miss their deadlines per time unit at every processor, due to dynamic failures in the presence of faulty hardware components. Based on this parameter, we deene three performance measures suitable for analysis of real-time systems, deadline-missed-reliability, deadline-missed-before-failure, and deadline-missed-time-reliability.
منابع مشابه
Stability analysis and feedback control of T-S fuzzy hyperbolic delay model for a class of nonlinear systems with time-varying delay
In this paper, a new T-S fuzzy hyperbolic delay model for a class of nonlinear systems with time-varying delay, is presented to address the problems of stability analysis and feedback control. Fuzzy controller is designed based on the parallel distributed compensation (PDC), and with a new Lyapunov function, delay dependent asymptotic stability conditions of the closed-loop system are derived v...
متن کاملEvaluating the Efficiency of Firms with Negative Data in Multi-Period Systems: An Application to Bank Data
Data Envelopment Analysis (DEA) is a mathematical technique to evaluate the performance of firms with multiple inputs and outputs. In conventional DEA models, the efficiency scores of Decision Making Units (DMUs) with non-negative inputs and outputs are evaluated in a special period of time. However, in the real world there are situations wherein performance of firms must be evaluated in multip...
متن کاملProbabilistic Analysis and Scheduling of Critical Soft Real - Time Systems
In addition to correctness requirements, a real-time system must also meet its temporal constraints, often expressed as deadlines. We call safety or mission critical real-time systems which may miss some deadlines critical soft real-time systems to distinguish them from hard real-time systems, where all deadlines must be met, and from soft real-time systems which are not safety or mission criti...
متن کاملReliability Analysis of Three Elements Series and Parallel Systems under Time-varying Fuzzy Failure Rate
Reliability is the most important performance issue in the engineering design process but in the real world problems, there are limitations for using the conventional reliability. Fuzzy logic has proved to be effective in expressing uncertainties in different fields, including reliability engineering. In this paper, For both the series and parallel systems composed of three identical or differe...
متن کاملOnline Monitoring for Industrial Processes Quality Control Using Time Varying Parameter Model
A novel data-driven soft sensor is designed for online product quality prediction and control performance modification in industrial units. A combined approach of time variable parameter (TVP) model, dynamic auto regressive exogenous variable (DARX) algorithm, nonlinear correlation analysis and criterion-based elimination method is introduced in this work. The soft sensor performance validation...
متن کاملA tool for optimal design of soft–real time systems
In recent years a series of important achievements have paved the way for the introduction of probabilistic analysis in the area of soft real–time systems design. In this paper, we present an extensible design tool – called PROSIT – that facilitates the access to this technology for a potentially large number of researchers and industrial practitioners. The tool enables probabilistic analysis o...
متن کامل