1. A multiprocessor computer system, comprising: a plurality of first processors having addresses with a first number of address bits operable to address locations in a first addressable memory space; a plurality of second processors having addresses with a second number of address bits operable to address locations in a second addressable memory space, the first number of address bits being smaller than the second number of address bits and the second addressable memory space having a different size than the first addressable memory space; and a plurality of nodes, wherein each one of the plurality of nodes has at least one of the plurality of first processors and at least one of the plurality of second processors, wherein the first addressable memory space includes a subset of a common address space, wherein the second addressable memory space includes at least a part of the common address space, and wherein a portion of the second addressable memory space is only directly addressable from the plurality of second processors.