| 1. |
- Oliveira, Pedro Almir, et al.
(författare)
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CIaaS : computational intelligence as a service with Athena
- 2018
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Ingår i: Computer languages, systems & structures. - : Elsevier Ltd. - 1477-8424 .- 1873-6866. ; 54, s. 95-118
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Tidskriftsartikel (refereegranskat)abstract
- Computational Intelligence (CI) is a sub-branch of Artificial Intelligence (AI) that focus on studying adaptive mechanisms to enable intelligent behavior in complex environments. CI techniques have been successful in solving complex problems in many different knowledge areas. However, despite their usefulness, developing solutions based on CI techniques is not a trivial activity, since it involves the codification/adaptation of algorithms to specific context and problems. In this paper, we present and validate through a quasi-experiment a new paradigm to develop CI-based solutions using a more mature version of Athena (2.0): Computational Intelligence as a Service (CIaaS). Using this tool, both researchers and practitioners can design and evaluate CI-based solutions by dragging and dropping components in a visual environment, in a cloud-based platform. The results of the quasi-experiment suggest that our approach can help researchers to design and evaluate CI-based systems in a simple, reliable and fast way. © 2018 Elsevier Ltd
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| 2. |
- Oliveira, Pedro, et al.
(författare)
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Athena : A Visual Tool to Support the Development of Computational Intelligence Systems
- 2014
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Ingår i: Proceedings-International Conference on Tools With Artificial Intelligence. - : IEEE Communications Society. ; , s. 950-957
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Konferensbidrag (refereegranskat)abstract
- Computational Intelligence (CI) embraces techniques designed to address complex real-world problems in which traditional approaches are ineffective or infeasible. Some of these techniques are being used to solve several complex problems, such as the team allocation, building products portfolios in a software product line and test case selection/prioritization. However, despite the usefulness of these applications, the development of solutions based in CI techniques is not a trivial activity, since it involves the implementation/adaptation of algorithms to specific context and problems. This work presents Athena, a visual tool developed aiming at offering a simple approachto develop CI-based software systems. In order to do this, we proposed a drag-and-drop approach, which we called CI as a Service (CIaaS). Based on a preliminary study, we can state that Athenacan help researchers to save time during the development of computational intelligence approaches.
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| 3. |
- Silva, Dennis Savio, et al.
(författare)
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A test case prioritization approach based on software component metrics
- 2019
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Ingår i: IEEE International Conference on Systems Man and Cybernetics Conference Proceedings. - : Institute of Electrical and Electronics Engineers Inc.. - 9781728145693 ; , s. 2939-2945
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Konferensbidrag (refereegranskat)abstract
- The most common way of performing regression testing is by executing all test cases associated with a software system. However, this approach is not scalable since time and cost to execute the test cases increase together with the system's size. A way to address this consists of prioritizing the existing test cases, aiming to maximize a test suite's fault detection rate. To address the limitations of existing approaches, in this paper we propose a new approach to maximize the rate of fault detection of test suites. Our proposal has three steps: I) infer code components' criticality values using a fuzzy inference system; ii) calculate test cases' criticality; iii) prioritize the test cases using ant colony optimization. The test cases are prioritized considering criticality, execution time and history of faults, and the resulting test suites are evaluated according to their fault detection rate. The evaluation was performed in eight programs, and the results show that the fault detection rate of the solutions was higher than in the non-ordered test suites and ones obtained using a greedy approach, reaching the optimal value when possible to verify. A sanity check was performed, comparing the obtained results to the results of a random search. The approach performed better at significant levels of statistic and practical difference, evidencing its true applicability to the prioritization of test cases. © 2019 IEEE.
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| 4. |
- Avritzer, Alberto A., et al.
(författare)
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A Multivariate Characterization and Detection of Software Performance Antipatterns
- 2021
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Ingår i: ICPE 2021 - Proceedings of the ACM/SPEC International Conference on Performance Engineering. - New York, NY, USA : Association for Computing Machinery, Inc. - 9781450381949 ; , s. 61-72
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Konferensbidrag (refereegranskat)abstract
- Context. Software Performance Antipatterns (SPAs) research has focused on algorithms for the characterization, detection, and solution of antipatterns. However, existing algorithms are based on the analysis of runtime behavior to detect trends on several monitored variables (e.g., response time, CPU utilization, and number of threads) using pre-defined thresholds. Objective. In this paper, we introduce a new approach for SPA characterization and detection designed to support continuous integration/delivery/deployment (CI/CDD) pipelines, with the goal of addressing the lack of computationally efficient algorithms. Method. Our approach includes SPA statistical characterization using a multivariate analysis approach of load testing experimental results to identify the services that have the largest impact on system scalability. More specifically, we introduce a layered decomposition approach that implements statistical analysis based on response time to characterize load testing experimental results. A distance function is used to match experimental results to SPAs. Results. We have instantiated the introduced methodology by applying it to a large complex telecom system. We were able to automatically identify the top five services that are scalability choke points. In addition, we were able to automatically identify one SPA. We have validated the engineering aspects of our methodology and the expected benefits by means of a domain experts' survey. Conclusion. We contribute to the state-of-The-Art by introducing a novel approach to support computationally efficient SPA characterization and detection in large complex systems using performance testing results. We have compared the computational efficiency of the proposed approach with state-of-The-Art heuristics. We have found that the approach introduced in this paper grows linearly, which is a significant improvement over existing techniques. © 2021 ACM.
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| 5. |
- Avritzer, Alberto A., et al.
(författare)
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PPTAMλ : What, Where, and How of Cross-domain Scalability Assessment
- 2021
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Ingår i: Proceedings - 2021 IEEE 18th International Conference on Software Architecture Companion, ICSA-C 2021. - : Institute of Electrical and Electronics Engineers Inc.. - 9781665439107 ; , s. 62-69
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Konferensbidrag (refereegranskat)abstract
- Software development ecosystems vary significantly among different industrial domains. Therefore, it is challenging to establish quality assurance processes that can be deployed seamlessly to multiple domains. In this paper, we extend our previous work on performance and scalability assessment by identifying the architecture variability points in our PPTAM tooling infrastructure. The goal is to design a modifiable software architecture that enables low cost deployment of our performance and scalability assessment approach. We present the scalability assessment context, architecture modifiability, and lessons learned that were derived from our experience with scalability assessment in several business domains. Specifically, we describe our experience with the application of the proposed approach to a large complex telecom system at Ericsson. © 2021 IEEE.
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| 6. |
- Avritzer, Alberto, et al.
(författare)
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Extending Survivability Models for Global Software Development with Media Synchronicity Theory
- 2015
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Ingår i: Proceeding of the IEEE 10th International Conference on Global Software Engineering. - : IEEE Communications Society. - 9781479984091 ; , s. 23-32
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Konferensbidrag (refereegranskat)abstract
- In this paper we propose a new framework to assess survivability of software projects accounting for media capability details as introduced in Media Synchronicity Theory (MST). Specifically, we add to our global engineering framework the assessment of the impact of inadequate conveyance and convergence available in the communication infrastructure selected to be used by the project, on the system ability to recover from project disasters. We propose an analytical model to assess how the project recovers from project disasters related to process and communication failures. Our model is based on media synchronicity theory to account for how information exchange impacts recovery. Then, using the proposed model we evaluate how different interventions impact communication effectiveness. Finally, we parameterize and instantiate the proposed survivability model based on a data gathering campaign comprising thirty surveys collected from senior global software development experts at ICGSE'2014 and GSD'2015.
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| 7. |
- Avritzer, Alberto, et al.
(författare)
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Scalability testing automation using multivariate characterization and detection of software performance antipatterns
- 2022
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Ingår i: Journal of Systems and Software. - : Elsevier. - 0164-1212 .- 1873-1228. ; 193
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Tidskriftsartikel (refereegranskat)abstract
- Context: Software Performance Antipatterns (SPAs) research has focused on algorithms for their characterization, detection, and solution. Existing algorithms are based on the analysis of runtime behavior to detect trends on several monitored variables, such as system response time and CPU utilization. However, the lack of computationally efficient methods currently limits their integration into modern agile practices to detect SPAs in large scale systems. Objective: In this paper, we extended our previously proposed approach for the automated SPA characterization and detection designed to support continuous integration/delivery/deployment (CI/CDD) pipelines, with the goal of addressing the lack of computationally efficient algorithms. Method: We introduce a machine learning-based approach to improve the detection of SPA and interpretation of approach's results. The approach is complemented with a simulation-based methodology to analyze different architectural alternatives and measure the precision and recall of our approach. Our approach includes SPA statistical characterization using a multivariate analysis of load testing experimental results to identify the services that have the largest impact on system scalability. Results: To show the effectiveness of our approach, we have applied it to a large complex telecom system at Ericsson. We have built a simulation model of the Ericsson system and we have evaluated the introduced methodology by using simulation-based SPA injection. For this system, we are able to automatically identify the top five services that represent scalability choke points. We applied two machine learning algorithms for the automated detection of SPA. Conclusion: We contributed to the state-of-the-art by introducing a novel approach to support computationally efficient SPA characterization and detection that has been applied to a large complex system using performance testing data. We have compared the computational efficiency of the proposed approach with state-of-the-art heuristics. We have found that the approach introduced in this paper grows linearly, which is a significant improvement over existing techniques. © 2022 Elsevier Inc.
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| 8. |
- Badampudi, Deepika, 1984-, et al.
(författare)
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Modern code reviews : Preliminary results of a systematic mapping study
- 2019
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Ingår i: PROCEEDINGS OF EASE 2019 - EVALUATION AND ASSESSMENT IN SOFTWARE ENGINEERING. - New York, NY, USA : Association for Computing Machinery. - 9781450371452 ; , s. 340-345
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Konferensbidrag (refereegranskat)abstract
- Reviewing source code is a common practice in a modern and collaborative coding environment. In the past few years, the research on modern code reviews has gained interest among practitioners and researchers. The objective of our investigation is to observe the evolution of research related to modern code reviews, identify research gaps and serve as a basis for future research. We use a systematic mapping approach to identify and classify 177 research papers. As preliminary result of our investigation, we present in this paper a classification scheme of the main contributions of modern code review research between 2005 and 2018. © 2019 Association for Computing Machinery.
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| 9. |
- Badampudi, Deepika, 1984-, et al.
(författare)
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Modern Code Reviews - Survey of Literature and Practice
- 2023
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Ingår i: ACM Transactions on Software Engineering and Methodology. - : Association for Computing Machinery (ACM). - 1049-331X .- 1557-7392. ; 32:4
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Forskningsöversikt (refereegranskat)abstract
- Background: Modern Code Review (MCR) is a lightweight alternative to traditional code inspections. While secondary studies on MCR exist, it is uanknown whether the research community has targeted themes that practitioners consider important.Objectives: The objectives are to provide an overview of MCR research, analyze the practitioners' opinions on the importance of MCR research, investigate the alignment between research and practice, and propose future MCR research avenues.Method: We conducted a systematic mapping study to survey state of the art until and including 2021, employed the Q-Methodology to analyze the practitioners' perception of the relevance of MCR research, and analyzed the primary studies' research impact.Results: We analyzed 244 primary studies, resulting in five themes. As a result of the 1,300 survey data points, we found that the respondents are positive about research investigating the impact of MCR on product quality and MCR process properties. In contrast, they are negative about human factor- and support systems-related research.Conclusion: These results indicate a misalignment between the state of the art and the themes deemed important by most survey respondents. Researchers should focus on solutions that can improve the state of MCR practice. We provide an MCR research agenda that can potentially increase the impact of MCR research. © 2023 Copyright held by the owner/author(s).
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| 10. |
- Britto, Ricardo, 1982-, et al.
(författare)
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An Empirical Investigation on Effort Estimation in Agile Global Software Development
- 2015
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Ingår i: Proceedings of the 2015 IEEE 10th International Conference on Global Software Engineering. - 9781479984091 ; , s. 38-45
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Konferensbidrag (refereegranskat)abstract
- Effort estimation is a project management activity that is mandatory for the execution of softwareprojects. Despite its importance, there have been just a few studies published on such activities within the Agile Global Software Development (AGSD) context. Their aggregated results were recently published as part of a secondary study that reported the state of the art on effort estimationin AGSD. This study aims to complement the above-mentioned secondary study by means of anempirical investigation on the state of the practice on effort estimation in AGSD. To do so, a survey was carried out using as instrument an on-line questionnaire and a sample comprising softwarepractitioners experienced in effort estimation within the AGSD context. Results show that the effortestimation techniques used within the AGSD and collocated contexts remained unchanged, with planning poker being the one employed the most. Sourcing strategies were found to have no or a small influence upon the choice of estimation techniques. With regard to effort predictors, globalchallenges such as cultural and time zone differences were reported, in addition to factors that are commonly considered in the collocated context, such as team experience. Finally, many challenges that impact the accuracy of the effort estimates were reported by the respondents, such as problems with the software requirements and the fact that the communication effort between sites is not properly accounted.
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