memory

Optimizing Software Applications for NUMA: Part 1 (of 7)

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:

Review of 2 Performance related Chapters of “The Intel Guide for Developing Multithreaded applications”

Adding parallel processing to code is a desire of every software company that has a program which is significant in complexity and which needs to run faster. Processor clock rates are not increasing much and now multiple cores are being added to chips instead. The problem of speeding up software is moving from a hardware improvement problem to a software parallelization problem. My past blog post Why Parallel Processing? Why now?

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