WG5: Energy efficiency

Energy consumption is one of the main limiting factor for the design of ultrascale infrastructures. Multi level hardware and software optimisations must be designed and explored in order to reduce energy consumption for these large scale equipment. The WG5 will address the issue of energy efficiency of ultrascale systems in front of other quality metrics. The goal of this WG is to explore the design of metrics, analysis, frameworks and tools for putting energy awareness and energy efficiency at the next stage. Significant emphasis will be placed on the idea of “energy  complexity”, reflecting the synergies between energy efficiency and Quality of Service, resilience and performance, by studying computation power, communication/data sharing power, data access power, algorithm energy consumption, etc.


Key objectives: Exploring sustainability in ultrascale systems: Contributing to the monitoring and energy analysis of large scale infrastructures; Proposing new holistic models of energy consumption for ultrascale systems; Designing and studying energy aware software components; Exploring energy consumption and energy efficiency metrics for multiple resources (computing, storage, networking); Helping users to express interest in energy issues for their applications; More than « energy in usage of IT » : taking care of more complete life cycle of data and computing centres (production, transport, cooling, recycling) for energy models.

Topics: Profiling and reporting energy usage of ultra scale computing by taking into account the full system (IT and infrastructure (cooling)) with multi-objective adapted metrics; Monitoring systems for heterogeneous ultrascale systems (low power servers, Graphics processing units (GPUs),…); Models of energy consumption as basis for ultra scale infrastructures software components; Analyzing energy efficiency metrics in the context of ultrascale systems; Impact of applying green leverages at large scale: shutdown and slowdown of resources; Energy efficient resource management and scheduling; Synergies and links with other WGs: tradeoffs between energy and performance, resilience, and eco-design of applications.


First WG Meeting. Madrid. July 2014.Slides.
Second WG Meeting. Paris. December 2014.Slides.
Third WG Meeting. Belgium. Leuven 2015.  Slides.
Fourth WG Meeting. Krakow. Poland 2015.  Slides.



Technical Reports
Position paper: Energy Efficiency for Ultrascale Systems: Challenges and Trends from Nesus Project

Position paper: On Energy Monitoring and Analysis of Ultra Scale Systems:
State of the Art and Future Directions

Focus Group

  • FG1 on metrics, monitoring, instrumentation and profiling