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Auflistung nach Schlagwort "energy efficiency"

1 - 5 von 5
  • Konferenzbeitrag
    Architecting for Sustainability
    (EnviroInfo 2022, 2022) Lago, Patricia; Greefhorst, Danny; Woods, Eoin
    Sustainability is becoming an increasingly important topic. Information Technology (IT) is an important factor for sustainability; it consumes a substantial, and growing, part of the world supply of energy, but it can also enable significant insights and improvements related to sustainability. These factors need to be taken into account in the design of IT systems, meaning that we need to architect for sustainability. This paper provides insights into the experience and beliefs of IT practitioners and researchers into current and desired practices of architecting for sustainability. It reports on the results of three workshop sessions with practitioners and researchers, providing insight into the state of research and practice.
  • Konferenzbeitrag
    EDA Scale - Assessing Awareness for Energy Dynamics
    (Mensch und Computer 2019 - Tagungsband, 2019) Gödker, Markus; Dresel, Markus; Franke, Thomas
    Energy-related behavior in resource dependent systems (e.g. electric vehicles, houses, ships) is an important factor for the actual energy efficiency such systems can achieve. Energy feedback human-machine-interfaces (HMIs) can support the awareness of energy dynamics in order to comprehend the situation and the influences on energy consumption and to control the system to enhance energy efficiency. To evaluate these HMIs a scale to assess the energy dynamics awareness (EDA) is needed. Therefore we developed the EDA scale with 7 items and tested the scale in a study with N = 40 battery electric bus (BEB) drivers on two different HMIs. First results indicated an excellent reliability (Cronbach’s α = .92 and .93) and principal factor analyses revealed a solid single factor structure (61.8% and 67.8% explained variance) with high factor loadings (> .61 for all items). Future studies should further explore the construct and criterion validity of the scale.
  • Konferenzbeitrag
    Energy Efficiency in Main-Memory Databases
    (Datenbanksysteme für Business, Technologie und Web (BTW 2017) - Workshopband, 2017) Noll, Stefan
    As the operating costs of today’s data centres continue to increase and processor man- ufacturers are forced to meet thermal design power constraints, the energy efficiency of a main-memory database management system becomes more and more important. In this paper, we experi- mentally study the impact of reducing the clock frequency of the processor on the energy efficiency of common database algorithms such as scans, simple aggregations, simple hash joins and state-of- the-art join algorithms. We stress the fundamental trade-off between peak performance and energy efficiency, as opposed to the established race-to-idle strategy. Ultimately, we learn that database workloads behave considerably different than other workload types and that reducing the computing power e.g. by limiting the clock frequency can significantly improve energy efficiency.
  • Textdokument
    Energy Efficiency of a Low Power Hardware Cluster for High Performance Computing
    (INFORMATIK 2017, 2017) Görtz, Michael Dominik; Kühn, Roland; Zietek, Oliver; Bernhard, Roman; Bulinski, Michael; Duman, Dennis; Freisen, Benedikt; Jentsch, Uwe; Klöppner, Tobias; Popovic, Dragana; Xu, Lili
    High performance computing has become more and more limited by the hardware’s energy consumption, rendering it increasingly difficult to build even faster compute clusters, while modern low power hardware is making great improvements, regarding its performance. In order to overcome the limited energy density, we propose to use low power System on a Chip (SoC) devices, instead of high performance CPUs, exploiting the energy efficiency of modern low power processors. We evaluated our suggestion by building a low power cluster based on 40 single board computers with ARM Cortex-A53 quad-core SoCs and measuring its performance, energy consumption and efficiency using synthetic and application benchmarks with different workload types. Our tests demonstrated that our cluster could perform the given benchmarks, using up to 70% less energy than an Intel-based reference server system, which lead to an increase in efficiency of up to 425%. Our evaluation showed that modern low power processors have become a good alternative for high performance computing, with large workloads profiting from massive parallelization and that we can expect further improvements in this field, regarding the hardware’s performance and efficiency.
  • Konferenzbeitrag
    Transient numerical simulation for optimization of a water-cooled high-performance computing center with dynamic cooling circuit temperatures – Work-in-progress
    (EnviroInfo 2022, 2022) Bayer, Nils; Kerskes, Henner; Stergiaropoulos, Konstantinos
    Due to the high consumption of electrical energy, data center operators are increasingly aiming for a data center that is as energy-optimized and efficient as possible. The cooling system has a crucial role here. In this context, an innovative control strategy with dynamic cooling circuit temperatures will be investigated. For this purpose, a detailed numerical simulation model of an existing water-cooled HPC data center cooling system was developed. The model was validated using real operating data. It includes the complete heat flow from the rack cooling distribution units to the cooling towers and the district cooling supply. The model can correctly simulate the thermal behavior in detail and is the basis for further investigations and optimization in terms of various criteria like energy or cost efficiency. The modeling and validation approach is presented in this paper.