NUMA refers to "Non-Uniform Memory Access", and is a technology for providing RAM that can be accessed faster by the local core or CPU than it can be by other cores present in the computer.

Under NUMA, a processor can access its own local memory faster than non-local memory (memory local to another processor or memory shared between processors). The benefits of NUMA are limited to particular workloads, notably on servers where the data are often associated strongly with certain tasks or users.

See the Wikipedia page on NUMA for more details.

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