This paper proposes the recursive diagonal torus (RDT), which is the interconnection network for the massively parallel computer with 216 or more processors. RDT can realize a small diameter (12 for 16 Knode) with a small number of links compared to the hypercube by adding links recursively along the diagonal direction of the two-dimensional torus. The packet is routed by a simple algorithm called vector routing. RDT not only includes a torus, but also easily implements the emulation of the hypercube or tree as well as the packet broadcast. Considering a typical packet transfer method, the random transfer performance is evaluated. A satisfactory result is obtained compared to the 2-D or 3-D torus, although somewhat inferior to the hypercube with a large number of links.
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