NUMA stands for Non-Uniform Memory Access, in other words a system whose memory is not all in one place. The numactl program allows you to run your application program on specific CPUs and memory nodes. It does this by supplying a NUMA memory policy to the operating system before running your program.

The package contains other commands, such as numastat, memhog, and numademo which provides a quick overview of NUMA performance on your system.