Torus fusion (Tofu) is an interconnect for massive parallel computers, and it has been developed to build the K computer that interconnects more than 80 000 nodes.The Tofu interconnect achieves high scalability beyond 100 000 nodes, high performance, high reliability, and high availability.The network topology is a highly scalable six-dimensional mesh/torus.The link throughput is 5 GB/s in each direction.Each node can communicate in four directions simultaneously.The three-dimensional torus rank-mapping scheme improves the system availability and the Tofu barrier interface (TBI) processes collective communications with low latency.Network interfaces and a router of the Tofu interconnect are integrated into a newly developed chip called InterConnect Controller (ICC).This paper describes overviews and characteristics of the ICC chip, the six-dimensional mesh/torus network, high-performance and highly reliable communication functions and the TBI.
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