NUMA nodes

[fjebaker]

NUMA nodes, a.k.a. the spectre that might cause your code to run unexpectedly slower some of the time. It seems appropriate since our new machine, echidna, has 2 NUMA nodes, and depending how your multi-core software gets allocated, you could be seeing a performance dip (or improvement). So we'll cover what that is, what it means, and steps you can take to work with NUMA domains effectively.