Final Exa2Green press release published

Approaching the end of the project after three years of research, the Exa2Green team can show remarkable results. Read more about it in the final project press release, available in English and German on our website:

Latest and final issue of the Exa2Green Newsletter is now available!

The sixth edition of the Exa2Green Newsletter has now been published - it can be downloaded here! Enjoy reading!

Article on Exa2Green results published in ICT-ENERGY LETTERS

The Exa2Green consortium has published two papers in the latest version of the ICT-ENERGY LETTERS.

Please download the newsletter here:

Exa2Green Newsletter #5 is available!

The fifth edition of the Exa2Green Newsletter has now been published - it can be downloaded here! Enjoy reading!

Exa2Green organises full day workshop at ISC 2015

Caught between the continuous technological advances and the global efforts for greener IT, power consumption of modern high performance computing systems has become a major challenge on the road to exascale computing. The workshop, titled “Power and Energy-Aware High Performance Computing on Emerging Technology”, focuses on new energy-aware computing paradigms and programming methodologies to address the problem of prohibitive power consumption by current hardware when extrapolating to exascale machines. The goal of this workshop is to bring together scientists and engineers from academia and industry with interests in energy-efficient computing.


Workshop topics will include:

  • Tools for advanced power consumption monitoring and profiling.
  • New multi-objective metrics for quantitative assessment and analysis of the energy profile of algorithms.
  • Smart algorithms using energy-efficient software models.
  • Power-aware implementations of numerical methods for high performance clusters.
  • Performance/energy optimization in applications, showcases, proof of concepts.


Keynote speakers of the event will be:

  • Axel Auweter (Leibniz Supercomputing Centre)
  • Prof. Dr. Kirk W. Cameron (Department of Computer Science, College of Engineering, Virginia Tech)
  • Prof. Dr. Dimitrios S. Nikolopoulos (School of Electronics, Electrical Engineering and Computer Science, Queen’s University of Belfast)
  • Prof. Dr. Rudolf Lohner (Steinbuch Center for Computing, Karlsruhe Institute of Technology)
  • Dr. Dominik Brunner (Empa)


The targeted audience comprises researchers, industry, HPC experts, hardware vendors, software engineers, simulation engineers, computer scientists, mathematicians and physicists with an interest in power consumption.


The workshop will take place in the frame of the ISC 2015 conference in Frankfurt (Germany) on 16th July 2015.


For more information on the conference, please visit:


Exa2Green partners attended EEHCO 2015 in Amsterdam (NL)

The HIPEAC Workshop on Energy Efficiency with Heterogeneous Computing (EEHCO 2015) invited researchers to present initial results showing novel ways to obtain energy efficiency when computation is performed with a combination of different core types.


Exa2Green partner Enrique Quinta S. Quintana-Orti from Universidad Jaume I of Castellon, Spain attended the workshop and presented the latest project results to the dedicated audience under the topic “Evaluating Asymmetric Multicore Systems-on-Chip using Iso-Metrics”.


For more information:


Exa2Green partners attend 1st Workshop On Approximate Computing (WAPCO 2015)

Research in the last few years has focused on approximate computing as a means to overcome the energy scaling barrier of computer systems. Energy savings can be achieved by utilizing the inherent error resilience of algorithms in many application domains such as signal processing, multimedia, data analytics and computational engineering, among others. Indeed, fully accurate arithmetic in specific phases of those applications may have only a marginal effect on output quality, especially if combined with error correction frameworks such as iterative refinement. For example, accurate execution may be traded off with lower energy consumption by providing the ability to scale supply voltage below nominal values and accommodate errors at the software layers, or use a simpler approximate solution such as lower precision arithmetic.


Designing such systems in a general-purpose computing environment requires a holistic view of all layers from algorithms, programming models, system software, and hardware down to the transistor level. This full-day workshop, which was organised in conjunction with HiPEAC 2015, was an inter-disciplinary effort to bring together researchers from the areas of mathematics, computer science, computer and electrical engineering to discuss challenges, risks and opportunities of approximate computing in all design layers.


Exa2Green partners of IBM Research - Zurich were present with a talk and a poster covering up their latest achievements under the topic "Fast Exponential Computation on SIMD Architectures".


Further information:

Optimisations of existing ART and/or HAM version for CPUs, and integration into COSMO – Exa2Green researcher reports further progress in Work Package 5

Within Task 5.1.2 of Exa2Green Work Package 5 - Showcase for energy-optimised aerosol chemistry packages – researcher Joseph Charles of CSCS is reporting relevant progress:


Extended standalone model test framework

We improved our initial simplistic 0-d box model by an extended standalone model test framework which reproduces as closely as possible the various chemical reactions between trace gases and aerosols occurring in our COSMO-ART baseline. The goal is to assess the performance and energy consumption of different versions of the underlying Kinetic Preprocessor (KPP-2.2.1, KPP-2.2.3 & KPPA-0.2.1) which invokes the solver of the system of stiff ODEs to simulate chemical kinetic systems. This test framework can thus be adapted to any other chemical models based on KPP to estimate the benefits of using an accelerated KPPA version (under private license, ParaTools Inc). This study was performed on Piz Daint at CSCS for a one-day simulation using a 111x54x10 domain size, and was based on a socket-to-socket comparison considering 8 threads for the OpenMP versions.


In particular, the preliminary results showed a dramatic 19x speedup on time-to-solution and a 18 fold improvement in node energy-to-solution between an OpenMP implementation of the original KPP-2.2.3 version of the baseline and a corresponding OpenMP code generated by KPPA-0.2.1. As for the GPU results, we observed an outstanding 20x speedup on time-to-solution and a 12 fold improvement in node energy-to-solution with respect to the original KPP-2.2.3 multi-core CPU version.


These results are as well related to task 2.3, namely the implementation of energy-aware elementary kernels.


Mixed precision COSMO-ART version

We upgraded our initial reference COSMO-ART baseline based on COSMO-4.30 to COSMO-5.1 to enable single precision in the COSMO model and couple it with a double precision implementation of the ART model. This effort required two one week-long visits at KIT to get support from Bernhard and Heike Vogel (ART's main developers). This task is still ongoing and will be subject to further considerations, such as the development of a full single precision implementation for the COSMO-ART coupled model, and the energy-to-solution and time-to-solution benchmarking of the new resulting baseline on Piz Daint and Piz Dora platforms at CSCS.

Exa2Green partners attend SC14 in New Orleans

During the SC14, to be held in New Orleans (LA, USA) between November 16th to 21st 2014, Exa2Green partners of IBM Research - Zurich will be present with a poster covering up their latest achievements. The presented research results will be summed up under "Machine Learning Algorithms for the Performance and Energy-Aware Characterization of Linear Algebra KErnels on Multithread Architectures".


The Exa2Green researchers involved into these activities are A. Cristiano Malossi, Costas Bekas and Alessandro Curioni of IBM Research - Zurich as well as Enrique S. Quintana-Ortí of Universitat Jaume I.

Invited talk: Costas Bekas of IBM Research - Zurich attended HiPEAC Computing Systems Week (CSW) 2014

HiPEAC, the European Network of Excellence on High Performance and Embedded Architecture and Compilation organised the HiPEAC Computing Systems Week (CSW) in Athens, Greece from 8th to 10th October 2014.


The CWS consists of various keynote speaches and thematic sessions. Exa2Green researcher Costas Bekas of IBM Research - Zurich gave an invited talk on "Changing Computing Paradigms Towards Power Efficiency". Other topics presented and discussed included Multicore Application Debugging, Big Data, or Hardware Security and Trust.

The fourth Exa2Green Newsletter is now available!

The fourth Exa2Green Newsletter is now published and can be found here. Enjoy your reading!

Exa2Green partners attended EACO Workshop on Analysis Techniques for Energy Aware Computing

The 7th Energy Aware COmputing (EACO) workshop has taken place on September 10-11, 2014, in Bristol (UK). This workshop series is supported by the University of Bristol Institute for Advanced Studies and industry sponsorships. Its aim is to bring together researchers and engineers with interests in energy-aware computing.

The recent edition of the workshop series was dedicated to analysis techniques for energy-aware computing. The agenda comprised 12 scientific and industry presentations contributed by the attendees from various European countries. Among the topics of the workshop, energy modelling and static analysis techniques for multi-core systems played a major role. Worst case execution time analysis is often an important aspect for embedded systems, in particular for safety-relevant applications. Researchers now seek to further develop the static timing analysis techniques to also account for energy.


Find out more on the EACO Website.

Exa2Green Partners participated at the ICT-Energy Community Workshop

The ICT-Energy project consortium organised a Community Workshop in Barcelona, Spain, on April 23 - 25, 2014, which was devoted to foster cooperation between the groups participating in the project. The three-days event was split into sessions with lectures about the science of ICT-energy, scientific talks, project group presentations and PhD talks. On the final day of the event, work groups approached different topics in parallel sessions.


ICT-Energy project's goal is to create a coordination activity among consortia involved in the ICT-ENERGY subject with specific reference to bringing together the existing "Toward Zero-Power ICT" community organized within the ZEROPOWER C.A. and the novel "MINECC" (Minimising energy consumption of computing to the limit) community recently funded under the FET Proactive Call 8 (FP7-ICT-2011-8) Objective 9.8. Heidelberg University, as coordinator of the Exa2Green project, is partner in the ICT-Energy project.


The Exa2Green project was represented at the Community Workshop by participants from Universitat Jaume I de Castellon, Spain, and from University of Heidelberg, Germany. Martin Wlotzka from Heidelberg gave a scientific talk on “Asynchronous iteration methods for GPU-accelerated HPC systems” and a short presentation of the Exa2Green project.


A very interesting point of the workshop was the exchange of ideas among the partners, that work in a wide range of issues related to energy saving. The talks traced a route from the hardware level to the applications layer, showing different approaches to reduce energy consumption. The complexity of this topic was also shown by the fact that participants came from diverse fields such as mathematics, physics, engineering and computer science.

The third Exa2Green Newsletter is now available!

The third Exa2Green Newsletter is published and can now be found here! Enjoy your reading!

The second Exa2Green Newsletter is now available!

The second Exa2Green Newsletter is published and can now be found here! Enjoy your reading!

The first Exa2Green Newsletter is now available!

The first Exa2Green Newsletter is published and can now be found here! Enjoy your reading!

News on EXA2GREEN project

Project's website launched

The project team proudly presents the new EXA2GREEN website. On this website we will inform and keep you updated on project activities, news and interesting events related to EXA2GREEN.