1. A computer system comprising a plurality of processor clusters and having a global address space associated therewith, each cluster including a plurality of local nodes and an interconnection controller interconnected by a local point-to-point architecture, each cluster having a local address space associated therewith corresponding to a first portion of the global address space, wherein the interconnection controller in each cluster represents to the associated local nodes a remainder portion of the global address space exclusive of the first portion, and wherein the interconnection controller in each cluster is operable to map locally generated address information to others of the clusters, and remotely generated address information to the local nodes.