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The L-CSC (Lattice Computer for Scientific Computing) is a general purposecompute cluster built of commodity hardware installed at GSI. Its mainoperational purpose is Lattice QCD (LQCD) calculations for physics simulations.Quantum Chromo Dynamics (QCD) is the physical theory describing the strongforce, one of the four known fundamental interactions in the universe. L-CSCleverages a multi-GPU design accommodating the huge demand of LQCD for memorybandwidth. In recent years, heterogeneous clusters with accelerators such asGPUs have become more and more powerful while supercomputers in general haveshown enormous increases in power consumption making electricity costs andcooling a significant factor in the total cost of ownership. Using mainly GPUsfor processing, L-CSC is very power efficient, and its architecture wasoptimized to provide the greatest possible power efficiency. This paperpresents the cluster design as well as optimizations to improve the powerefficiency. It examines the power measurements performed for the Green500 listof the most power efficient supercomputers in the world which led to the number1 position as the greenest supercomputer in November 2014.

The L-CSC cluster: greenest supercomputer in the world in Green500 list of November 2014