Non-uniform memory access (NUMA) is a computer memory design utilized in multiprocessing, where the memory entry time depends upon the memory location relative to the processor. Beneath NUMA, a processor can entry its personal native memory quicker than non-native memory (memory native to another processor or memory shared between processors). NUMA is useful for workloads with excessive memory locality of reference and low lock contention, because a processor could function on a subset of memory principally or MemoryWave Guide totally within its personal cache node, decreasing site visitors on the memory bus. NUMA architectures logically follow in scaling from symmetric multiprocessing (SMP) architectures. They have been developed commercially in the course of the nineteen nineties by Unisys, Convex Pc (later Hewlett-Packard), Honeywell Information Methods Italy (HISI) (later Groupe Bull), Silicon Graphics (later Silicon Graphics Worldwide), Sequent Computer Programs (later IBM), Knowledge Basic (later EMC, now Dell Technologies), Digital (later Compaq, then HP, now HPE) and ICL. Techniques developed by these firms later featured in a wide range of Unix-like working methods, and to an extent in Home windows NT.

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