A torus assignment for an interconnection network recursive diagonal torus

Recursive Diagonal Torus (RDT) is a class of interconnection network consisting of recursively overlaid two-dimensional square diagonal tori for massively parallel computers, with up to 216 nodes. Connection structures of the RDT vary according to the assignment of upper rank diagonal tori into a node. Although traditional simple assignment called RDT(2,4,1)//spl alpha/ shows enough performance under the uniform traffic, the congestion of low rank tori degrades the performance when local communication is dominant. RDT(2,4,1)//spl beta/ torus assignment is proposed, focusing on improving the performance for local communication. With a simplified simulation algorithm, the result shows that RDT(2,4,1)//spl beta/ improves the average distance compared with RDT(2,4,1)//spl alpha/ assignment when considering local area.