International Journal of Software Engineering, Technology and Applications
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International Journal of Software Engineering, Technology and Applications (3 papers in press)
An Efficient Rejuvenation Policy to Cope with Software Aging Phenomenon by Amir Akhavan Bitaraf, Moona Yakhchi, Hakem Beitollahi, Mahdi Fazeli Abstract: Software aging is a well-known challenge in most software systems that lead
to serious performance degradation or frequent failures in these systems. Several
proactive rejuvenation techniques have been proposed to tackle software aging
and prevent failures. Rejuvenation techniques are mostly categorized into two
main classes: Time-based techniques and failure prediction based techniques.
This article proposes a new method for software rejuvenation that follows a
new policy for determining the time of rejuvenation. Our new policy includes two
parts: 1) Considering a set of rejuvenation time points based on a static analysis
of system behavior in the presence of software aging effect; 2) Dynamically
changing the scheduling points based on a dynamic analysis of system workload.
In fact, our policy employs a straightforward time-based technique as a base-line
and then dynamically changes the selected points based on predicting the lowest
workload time. In comparison to the second category of rejuvenation techniques, our
policy predicts the occurrence time of the lowest workload instead of occurrence
of failure time.
Our new strategy effectively and dynamically changes the static points of a
time-based policy. Simulation results in comparison to other well-known time-based
rejuvenation techniques indicate the system availability improves between 0.3%
to 7.3%. Moreover, our technique significantly reduces the overall rejuvenation
cost (up to 71%). Keywords: Software Aging; Software Rejuvenation.
A robust software reliability growth model for accurate detection of software failures by Jagadeesh Medapati, Anand Chandulal Jasti, T.V. Rajinikanth Abstract: This paper pinpoints to detect and eliminate the actual software failures efficiently. The approach fits in a particular case of generalised gamma mixture model (GGMM), namely exponential distribution. The approach estimates two parameters using maximum likelihood estimation (MLE). Standard evaluation metrics like mean square error (MSE), coefficient of determination (R2), sum of squares (SSE), and root means square error (RMSE) were calculated. For the justification of the model selection and goodness of fit various model selection frameworks like chi-square goodness of fit, Walds test, Akaike information criteria (AIC), AICc and Schwarz criterion (SBC) were also estimated. The experimentation was carried out on five benchmark datasets which interpret the considered novel technique identifies the actual failures on par with the existing models. This paper presents a robust software reliability growth model which is more effectual in the identification of the failures. This helps the present software organisations in the release of bug-free software just in time. Keywords: software reliability; error; reviews; generalised gamma mixture model; GGMM; benchmark datasets. DOI: 10.1504/IJSETA.2022.10044820
A literature review on fault tolerance in SOA-based systems by Swati Goel, Ratneshwar Gupta Abstract: The basic concept of service oriented architecture (SOA) is used in cloud computing, internet of things, etc. in which services may be obtained from remote places. The desired goal is that a system should continuously provide services even in the presence of faults. This makes fault tolerance an essential quality of a SOA-based system. SOA have some special characteristics like loose coupling, service level agreements, platform independence, etc. These features provide easy access of software services but on the other side may produce newer possibilities of faults. In this work, a systematic literature review is done to investigate that how fault tolerance issue is handled in a SOA-based system. Several relevant approaches are identified and categorised in a meaningful manner. Parameters that affect the fault tolerance especially for SOA-based systems, directly or indirectly, are summarised for better understanding. Various issues and challenges to achieve fault tolerance are identified and discussed purposefully. While working with multi version fault tolerance method, acceptance test is an important criterion. Commonalities and differences of various acceptance test methods are highlighted. The obtained results will enable academicians and novice researchers to make effective decision on fault tolerance of SOA-based systems. Keywords: service oriented architecture; SOA; fault tolerance; software faults; redundancy; replication. DOI: 10.1504/IJSETA.2022.10049782