Alexandre Fonte

Dr. Alexandre Fonte

orcid

Research Focus & Metrics

Academic Career Length

12Years (2015-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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9 April 2024 in Computers
Verified
Journal Article
Open access
PDF file
DSDaniel Silva
Daniel Silva
JRJoão Rafael
João Rafael
AFAlexandre Fonte
Alexandre Fonte
Traditional hypervisor-assisted virtualization is a leading virtualization technology in data centers, providing cost savings (CapEx and OpEx), high availability, and disaster recovery. However, its inherent overhead may hinder performance and seems not scale or be flexible enough for certain applications, such as microservices, where deploying an application using a virtual machine is a longer and resource-intensive process. Container-based virtualization has received attention, especially with Docker, as an alternative, which also facilitates continuous integration/continuous deployment (CI/CD). Meanwhile, LXD has reactivated the interest in Linux LXC containers, which provides unique operations, including live migration and full OS emulation. A careful analysis of both options is crucial for organizations to decide which best suits their needs. This study revisits key concepts about containers, exposes the advantages and limitations of each container technology, and provides an up-to-date performance comparison between both types of containers (applicational vs. system). Using extensive benchmarks and well-known workload metrics such as CPU scores, disk speed, and network throughput, we assess their performance and quantify their virtualization overhead. Our results show a clear overall trend toward meritorious performance and the maturity of both technologies (Docker and LXD), with low overhead and scalable performance. Notably, LXD shows greater stability with consistent performance variability.

3 October 2015
Verified
Conference Paper
Open access
PDF file
LRLuís Rolo
Luís Rolo
AFAlexandre Fonte
Alexandre Fonte
ELEurico Lopes
Eurico Lopes
A evolução da computação na nuvem tem atraído bastantes adeptos, de tal forma que existem cada vez mais aplicações e serviços disponibilizados por este tipo de infraestruturas, a custos razoáveis, consoante a necessidade e quantidade, devido aos seus recursos elásticos sob solicitação. A grande capacidade de armazenamento, processamento e execução de grandes volumes de informação, tem potenciado a que arquiteturas como Data Warehouses sejam hospedadas na nuvem, provocando o surgimento de novas aplicações analíticas. A necessidade de envio de informação sobre a atividade fiscal dos contribuintes ou empresas para os portais do governo de forma automática e integrada, bem como, a ausência de um local centralizado para a sua consulta tem-se revelado um problema. Daí que, este artigo apresente uma proposta de arquitetura para um sistema de gestão e auditoria na nuvem de documentação fiscal, possibilitando o envio automático da informação e a sua consulta.