US Patent 7596654 Virtual machine spanning multiple computers

In one embodiment, a virtual NUMA system may be formed from multiple computer systems coupled to a network such as InfiniBand, Ethernet, etc. Each computer includes one or more software modules which present the resources of the computers as a virtual NUMA machine. A single instance of a guest operating system executes on the virtual NUMA machine. The guest operating system is designed to execute on a NUMA system and executes without modification on the virtual machine. The memory model of the virtual NUMA machine includes a single writer, multiple reader memory model.