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Cpu - Symmetry

The relationship of equality among components of a multiprocessor system in which no processor is special with respect to its access to memory, interrupts, or I/O. For interrupts, symmetry means that any interrupt from any source can be routed to any processor and handled there. For I/O, it means that all I/O control registers, be they in memory space, I/O space, or some other special address space, are accessible to all processors. Per-processor control hardware, such as interrupt controllers or processor identification registers, must be at the same physical address for all processors.