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The BlackWidow High-Radix Clos Network
2006
SIGARCH Computer Architecture News
This paper describes the radix-64 folded-Clos network of the Cray BlackWidow scalable vector multiprocessor. We describe the BlackWidow network which scales to 32K processors with a worstcase diameter of seven hops, and the underlying high-radix router microarchitecture and its implementation. By using a high-radix router with many narrow channels we are able to take advantage of the higher pin density and faster signaling rates available in modern ASIC technology. The BlackWidow router is an
doi:10.1145/1150019.1136488
fatcat:746ci6xhgvd6bcqau4ifp45xo4