1. The Basics of NUMA
NUMA, or Non-Uniform Memory Access, is a shared memory architecture that describes the placement of main memory modules with respect to processors in a multiprocessor system. Perhaps the best way to understand NUMA is to compare it with its cousin UMA, or Uniform Memory Access.
In the UMA memory architecture, all processors access shared memory through a bus (or another type of interconnect) as seen in the following diagram:
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