an architecture that does not support constant-time read and write operations. In most NUMA systems, memory is organized hierarchically, so that some portions can be read and written more quickly than others by a given processor.
Non-Uniform Memory Access or Non-Uniform Memory Architecture (NUMA) is a computer memory design used in multiprocessors, where the memory access time depends on the memory location relative to a processor. Under NUMA, a processor can access its own local memory faster than non-local memory, that is, memory local to another processor or memory shared between processors.