This entry in this series covers the general interaction of PostgreSQL and Linux on NUMA systems. This topic is complex and so there are cases of simplification. However this distills the general information about running PostgreSQL 17 and below (or Postgres 18 without libnuma support) on NUMA systems, with Linux as a reference point. By the end of this blog entry, you should both be able to run Postgres on a NUMA system and also understand why the libnuma support in PostgreSQL 18 is so important.