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Sobre

Sobre

Sou um investigador pos-doutorado focando em reduzir e analisar e optimizar os consumos energéticos de software, usando análise de código em conjunto com técnicas de manipulação. Consegui uma bolsa FCT para financiar o doutoramento. Sou um dos membros fundadores dos projectos Green Software for Space Control Mission (GreenSSCM), Software Repositories for Green Computing FLAD/NSF, e Green Software Lab: Green Computing as an Engineering Discipline (GSL).

Conclui o meu grau de doutor no programa doutoral MAP-i na Universidade do Minho com a tese "Energyware Engineering: Techniques and Tools for Green Software Development". Recebi o meu grau de mestre em Engenharia Informatica em 2013, com a tese intitulada "Querying for Model-Driven Spreadsheets", no âmbito do projecto SpreadSheets as a Programming Paradigm (SSaaPP).

Actualmente, o meu interesse de investigação está focado em green computing, interação homem-máquina, e análise e manipulação de código.

Tópicos
de interesse
Detalhes

Detalhes

  • Nome

    Rui Alexandre Pereira
  • Cargo

    Investigador Colaborador Externo
  • Desde

    01 julho 2013
001
Publicações

2023

Paint Your Programs Green: On the Energy Efficiency of Data Structures

Autores
Pereira, R; Couto, M; Cunha, J; Melfe, G; Saraiva, J; Fernandes, JP;

Publicação
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

Abstract
This tutorial aims to provide knowledge on a different facet of efficiency in data structures: energy efficiency. As many recent studies have shown, the main roadblock in regards to energy efficient software development are the misconceptions and heavy lack of support and knowledge, for energy-aware development, that programmers have. Thus, this tutorial aims at helping provide programmers more knowledge pertaining to the energy efficiency of data structures. We conducted two in-depth studies to analyze the performance and energy efficiency of various data structures from popular programming languages: Haskell and Java. The results show that within the Haskell programming language, the correlation between performance and energy consumption is statistically almost identical, while there are cases with more variation within the Java language. We have presented which data structures are more efficient for common operations, such as inserting and removing elements or iterating over the data structure. The results from our studies can help support developers in better understanding such differences within data structures, allowing them to carefully choose the most adequate implementation based on their requirements and goals. We believe that such results will help further close the gap when discussing the lack of knowledge in energy efficient software development. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

2023

CI/CD Meets Block-Based Languages

Autores
da Giao, H; Pereira, R; Cunha, J;

Publicação
2023 IEEE SYMPOSIUM ON VISUAL LANGUAGES AND HUMAN-CENTRIC COMPUTING, VL/HCC

Abstract
Continuous Integration and Continuous Deployment (CI/CD) pipelines play a vital role in the DevOps process, enabling developers to automate and enhance software delivery. However, the existence of multiple technologies, such as GitHub Actions, GitLab CI/CD, or Jenkins, poses challenges due to their lack of interoperability and the use of different programming languages for pipeline construction. To address these challenges and improve the CI/CD process, our objective is to develop a block-based language specifically designed for representing CI/CD pipelines. With our language, we intend to empower users to more easily create correct pipelines. Through an interactive and user-friendly process, our approach guides users in constructing pipelines, ensuring accuracy and reducing errors. Additionally, our language will facilitate seamless transitions between different pipeline technologies, providing users with flexibility and ease of adoption.

2023

Energy Efficient Software in an Engineering Course

Autores
Saraiva, J; Pereira, R;

Publicação
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

Abstract
Sustainable development has become an increasingly important theme not only in the world politics, but also an increasingly central theme for the engineering professions around the world. Software engineers are no exception as shown in various recent research studies. Despite the intensive research on green software, today’s undergraduate computing education often fails to address our environmental responsibility. In this paper, we present a module on energy efficient software that we introduced as part of an advanced course on software analysis and testing. In this module students study techniques and tools to analyze and optimize energy consumption of software systems. Preliminary results of the first four instances of this course show that students are able to optimize the energy consumption of software systems. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

2022

WebAssembly versus JavaScript: Energy and Runtime Performance

Autores
De Macedo, J; Abreu, R; Pereira, R; Saraiva, J;

Publicação
2022 INTERNATIONAL CONFERENCE ON ICT FOR SUSTAINABILITY (ICT4S 2022)

Abstract
The worldwide Web has dramatically evolved in recent years. Web pages are dynamic, expressed by programs written in common programming languages given rise to sophisticated Web applications. Thus, Web browsers are almost operating systems, having to interpret/compile such programs and execute them. Although JavaScript is widely used to express dynamic Web pages, it has several shortcomings and performance inefficiencies. To overcome such limitations, major IT powerhouses are developing a new portable and size/load efficient language: WebAssembly. In this paper, we conduct the first systematic study on the energy and run-time performance of WebAssembly and JavaScript on the Web. We used micro-benchmarks and also real applications in order to have more realistic results. Preliminary results show that WebAssembly, while still in its infancy, is starting to already outperform JavaScript, with much more room to grow. A statistical analysis indicates that WebAssembly produces significant performance differences compared to JavaScript. However, these differences differ between micro-benchmarks and real-world benchmarks. Our results also show that WebAssembly improved energy efficiency by 30%, on average, and showed how different WebAssembly behaviour is among three popular Web Browsers: Google Chrome, Microsoft Edge, and Mozilla Firefox. Our findings indicate that WebAssembly is faster than JavaScript and even more energy-efficient. Additionally, our benchmarking framework is also available to allow further research and replication.

2022

Energy Efficiency of Web Browsers in the Android Ecosystem

Autores
Gonçalves, N; Rua, R; Cunha, J; Pereira, R; Saraiva, J;

Publicação
CoRR

Abstract