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  • 1.
    Kidane, Lidia
    et al.
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Townend, Paul
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Metsch, Thijs
    Intel Corporation, Germany.
    Elmroth, Erik
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    When and How to Retrain Machine Learning-based Cloud Management Systems2022In: 2022 IEEE International Parallel and Distributed Processing Symposium Workshops (IPDPSW), IEEE, 2022, p. 688-698Conference paper (Refereed)
    Abstract [en]

    Cloud management systems increasingly rely on machine learning (ML) models to predict incoming workload rates, load, and other system behaviors for efficient dynamic resource management. Current state-of-the-art prediction models demonstrate high accuracy, but assume that data patterns remain stable. However, in production use, systems may face hardware upgrades, changes in user behavior etc. that lead to concept drifts - significant changes in characteristics of data streams over time. To mitigate prediction deterioration, ML models need to be updated - but questions of when and how to best retrain these models are unsolved in the context of cloud management. We present a pilot study that address these questions for one of the most common models for adaptive prediction - Long Short Term Memory (LSTM) - using synthetic and real-world workload data. Our analysis of when to retrain explores approaches for detecting when retraining is required using both concept drift detection and prediction error thresholds, and at what point of retraining should actually take place. Our analysis of how to retrain focuses on the data required for retraining, and what proportion should be taken from before and after the need for retraining is detected. We present initial results that indicate that retraining of existing models can achieve prediction accuracy close to that of newly trained models but for much less cost, and present initial advice for how to provide cloud management systems with support for automatic retraining of ML-based methods.

  • 2.
    Patel, Yashwant Singh
    et al.
    Umeå University, Faculty of Science and Technology, Department of Computing Science. Department of Computer Science and Engineering, Thapar Institute of Engineering and Technology, Patiala, Punjab, India.
    Townend, Paul
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Singh, Anil
    Umeå University, Faculty of Science and Technology, Department of Computing Science. Department of Computer Science and Engineering, Thapar Institute of Engineering and Technology, Patiala, Punjab, India.
    Östberg, Per-Olov
    Umeå University, Faculty of Science and Technology, Department of Computing Science. Biti Innovations, Umeå, Sweden.
    Modeling the green cloud continuum: integrating energy considerations into cloud-edge models2024In: Cluster Computing, ISSN 1386-7857, E-ISSN 1573-7543Article in journal (Refereed)
    Abstract [en]

    The energy consumption of Cloud–Edge systems is becoming a critical concern economically, environmentally, and societally; some studies suggest data centers and networks will collectively consume 18% of global electrical power by 2030. New methods are needed to mitigate this consumption, e.g. energy-aware workload scheduling, improved usage of renewable energy sources, etc. These schemes need to understand the interaction between energy considerations and Cloud–Edge components. Model-based approaches are an effective way to do this; however, current theoretical Cloud–Edge models are limited, and few consider energy factors. This paper analyses all relevant models proposed between 2016 and 2023, discovers key omissions, and identifies the major energy considerations that need to be addressed for Green Cloud–Edge systems (including interaction with energy providers). We investigate how these can be integrated into existing and aggregated models, and conclude with the high-level architecture of our proposed solution to integrate energy and Cloud–Edge models together.

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  • 3.
    Patel, Yashwant Singh
    et al.
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Townend, Paul
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Östberg, Per-Olov
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Formal models for the energy-aware cloud-edge computing continuum: analysis and challenges2023In: 2023 IEEE international conference on service-oriented system engineering (SOSE): proceedings / [ed] Lisa O'Conner, IEEE, 2023, p. 48-59Conference paper (Refereed)
    Abstract [en]

    Cloud infrastructures are rapidly evolving from centralised systems to geographically distributed federations of edge devices, fog nodes, and clouds. These federations (often referred to as the Cloud-Edge Continuum) are the foundation upon which most modern digital systems depend, and consume enormous amounts of energy. This consumption is becoming a critical issue as society's energy challenges grow, and is a great concern for power grids which must balance the needs of clouds against other users. The Continuum is highly dynamic, mobile, and complex; new methods to improve energy efficiency must be based on formal scientific models that identify and take into account a huge range of heterogeneous components, interactions, stochastic properties, and (potentially contradictory) service-level agreements and stakeholder objectives. Currently, few formal models of federated Cloud-Edge systems exist - and none adequately represent and integrate energy considerations (e.g. multiple providers, renewable energy sources, pricing, and the need to balance consumption over large-areas with other non-Cloud consumers, etc.). This paper conducts a systematic analysis of current approaches to modelling Cloud, Cloud-Edge, and federated Continuum systems with an emphasis on the integration of energy considerations. We identify key omissions in the literature, and propose an initial high-level architecture and approach to begin addressing these - with the ultimate goal to develop a set of integrated models that include data centres, edge devices, fog nodes, energy providers, software workloads, end users, and stakeholder requirements and objectives. We conclude by highlighting the key research challenges that must be addressed to enable meaningful energy-aware Cloud-Edge Continuum modelling and simulation.

    The full text will be freely available from 2025-09-26 06:59
  • 4.
    Saleh Sedghpour, Mohammad Reza
    et al.
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Townend, Paul
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Service mesh and eBPF-powered microservices: a survey and future directions2022In: 2022 IEEE International Conference on Service-Oriented System Engineering (SOSE), IEEE, 2022, p. 176-184Conference paper (Refereed)
    Abstract [en]

    Modern software development practice has seen a profound shift in architectural design, moving from monolithic approaches to distributed, microservice-based architectures. This allows for much simpler and faster application orchestration and management, especially in cloud-based systems, with the result being that orchestration systems themselves are becoming a key focus of computing research.

    Orchestration system research addresses many different subject areas, including scheduling, automation, and security. However, the key characteristic that is common throughout is the complex and dynamic nature of distributed, multi-tenant cloud-based microservice systems that must be orchestrated. This complexity has led to many challenges in areas such as inter-service communication, observability, reliability, single cluster to multi-cluster, hybrid environments, and multi-tenancy.

    The concept of service meshes has been introduced to handle this complexity. In essence, a service mesh is an infrastructure layer built directly into the microservices - or the nodes of orchestrators - as a set of configurable proxies that are responsible for the management, observability, and security of microservices.

    Service meshes aim to be a full networking solution for microservices; however, they also introduce overhead into a system - this can be significant for low-powered edge devices, as service mesh proxies work in user space and are responsible for processing the incoming and outgoing traffic of each service. To mitigate performance issues caused by these proxies, the industry is pushing the boundaries of monitoring and security to kernel space by employing eBPF for faster and more efficient responses. 

    We propose that the movement towards the use of service meshes as a networking solution for most of the required features by industry - combined with their integration with eBPF - is the next key trend in the evolution of microservices. This paper highlights the challenges of this movement, explores its current state, and discusses future opportunities in the context of microservices. 

  • 5.
    Tarneberg, William
    et al.
    Lund University, Department of Electrical and Information Technology, Sweden.
    Fitzgerald, Emma
    Lund University, Department of Electrical and Information Technology, Sweden.
    Bhuyan, Monowar H.
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Townend, Paul
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Arzen, Karl-Erik
    Department of Automatic Control, Lund University, Sweden.
    Östberg, Per-Olov
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Elmroth, Erik
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Eker, Johan
    Department of Automatic Control, Lund University, Sweden.
    Tufvesson, Fredrik
    Lund University, Department of Electrical and Information Technology, Sweden.
    Kihl, Maria
    Lund University, Department of Electrical and Information Technology, Sweden.
    The 6G Computing Continuum (6GCC): Meeting the 6G computing challenges2022In: 2022 1st International Conference on 6G Networking, 6GNet 2022, IEEE Computer Society, 2022Conference paper (Refereed)
    Abstract [en]

    6G systems, such as Large Intelligent Surfaces, will require distributed, complex, and coordinated decisions through-out a very heterogeneous and cell free infrastructure. This will require a fundamentally redesigned software infrastructure accompanied by massively distributed and heterogeneous computing resources, vastly different from current wireless networks. To address these challenges, in this paper, we propose and motivate the concept of a 6G Computing Continuum (6GCC) and two research testbeds, to advance the rate and quality of research. 6G Computing Continuum is an end-to-end compute and software platform for realizing large intelligent surfaces and its tenant users and applications. One for addressing the challenges or orchestrating shared computational resources in the wireless domain, implemented on a Large Intelligent Surfaces testbed. Another simulation-based testbed is intended to address scalability and global-scale orchestration challenges.

  • 6.
    Townend, Paul
    et al.
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Martí, Alberto P.
    OpenNebula Systems, Spain.
    De La Iglesia, Idoia
    IKERLAN, Spain.
    Matskanis, Nikolaos
    Centre d’Excellence en Technologies de l’Information et de la Communication (CETIC), Belgium.
    Ohlson Timoudas, Thomas
    Digital Systems Division, Computer Science, RISE Research Institutes of Sweden, Sweden.
    Hallmann, Torsten
    SUSE, Germany.
    Lalaguna, Antonio
    Aeronaval de Construcciones e Instalaciones (ACISA), Spain.
    Swat, Kaja
    Phoenix Systems, Poland.
    Renzi, Francesco
    Nature 4.0 SB Srl & University of Tuscia DIBAF, Italy.
    Bocheński, Dominik
    Atende Industries, Poland.
    Mancini, Marco
    OpenNebula Systems, Spain & CMCC Foundation, Italy.
    Bhuyan, Monowar H.
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    González-Hierro, Marco
    IKERLAN, Spain.
    Dupont, Sébastien
    Centre d’Excellence en Technologies de l’Information et de la Communication (CETIC), Belgium.
    Kristiansson, Johan
    Digital Systems Division, Computer Science, RISE Research Institutes of Sweden, Sweden.
    Montero, Rubén S.
    OpenNebula Systems & Universidad Complutense de Madrid, Spain.
    Elmroth, Erik
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Valdés, Iván
    IKERLAN, Spain.
    Massonet, Philippe
    Centre d’Excellence en Technologies de l’Information et de la Communication (CETIC), Belgium.
    Olsson, Daniel
    Digital Systems Division, Computer Science, RISE Research Institutes of Sweden, Sweden.
    Llorente, Ignacio M.
    OpenNebula Systems, Spain.
    Östberg, Per-Olov
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Abdou, Michael
    OpenNebula Systems, Spain.
    COGNIT: challenges and vision for a serverless and multi-provider cognitive cloud-edge continuum2023In: 2023 IEEE International Conference on Edge Computing and Communications (EDGE), IEEE, 2023, p. 12-22Conference paper (Refereed)
    Abstract [en]

    Use of the serverless paradigm in cloud application development is growing rapidly, primarily driven by its promise to free developers from the responsibility of provisioning, operating, and scaling the underlying infrastructure. However, modern cloud-edge infrastructures are characterized by large numbers of disparate providers, constrained resource devices, platform heterogeneity, infrastructural dynamicity, and the need to orchestrate geographically distributed nodes and devices over public networks. This presents significant management complexity that must be addressed if serverless technologies are to be used in production systems. This position paper introduces COGNIT, a major new European initiative aiming to integrate AI technology into cloud-edge management systems to create a Cognitive Cloud reference framework and associated tools for serverless computing at the edge. COGNIT aims to: 1) support an innovative new serverless paradigm for edge application management and enhanced digital sovereignty for users and developers; 2) enable on-demand deployment of large-scale, highly distributed and self-adaptive serverless environments using existing cloud resources; 3) optimize data placement according to changes in energy efficiency heuristics and application demands and behavior; 4) enable secure and trusted execution of serverless runtimes. We identify and discuss seven research challenges related to the integration of serverless technologies with multi-provider Edge infrastructures and present our vision for how these challenges can be solved. We introduce a high-level view of our reference architecture for serverless cloud-edge continuum systems, and detail four motivating real-world use cases that will be used for validation, drawing from domains within Smart Cities, Agriculture and Environment, Energy, and Cybersecurity.

  • 7.
    Townend, Paul
    et al.
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Wo, Tianyu
    Beihang University, China.
    Welcome message from the general chairs of IEEE JCC 20222022In: Proceedings: 2022 IEEE 13th International Conference on Joint Cloud Computing, IEEE Computer Society, 2022, p. VIII-VIIIChapter in book (Other academic)
1 - 7 of 7
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