Kraken | National Institute for Computational Sciences: "Kraken
The new Kraken is a Cray XT5 system, consisting of 8256 compute nodes, each with two 2.3 GHz quad-core AMD Opteron processors, totaling 66048 compute cores. Compute nodes run Compute Node Linux (CNL) 2.1, an operating system designed to minimize overhead, thus allowing scalable low-latency global communication. Each node is connected to a Cray SeaStar router through HyperTransport, and the SeaStars are all interconnected in a 3-D-torus topology. The resulting interconnect has very high bandwidth, low latency, and extreme scalability."