Section: Partnerships and Cooperations

European Initiatives

Collaborations in European Programs, except FP7

Energy efficiency in large scale distributed systems.

Stéphane Vialle, Sylvain Contassot-Vivier and Thomas Jost participate to the COST (European Cooperation in the field of Scientific and Technical Research) Action IC0804 (Energy efficiency in large scale distributed systems ), started in 2010.

Our designs of PDE solvers using synchronous and asynchronous distributed algorithms, implemented and experimented both on CPU and GPU clusters, have led to the design of some performance models. Main results have been introduced in 2011 in a book chapter [26] .

Moreover, in 2011 we achieved a first design of a software architecture to build self-configurating applications, in order to track a user instruction (to run fast, or to run consuming low energy, or to run achieving a compromise) in an execution environment imposing some energy constraints on application runs. This software architecture has been introduced to the COST IC0804 meeting of May 19-20, 2011 in Budapest. This software architecture is still under investigation, and its implementation is planned for 2012.

Finally, in 2011 we have achieved the implementation of an American option pricer on our GPU clusters, and we have run many experiments to measure its speedup and energy gain. A second version, more efficient, including an optimized 4D to 2D reduction on each GPU node, is under experimentation at the end of 2011. These research are conducted in collaboration with some colleagues of University of Marne-la-Vallée.