How do I know if my server has NUMA?

Question

Hopping from Java Garbage Collection, I came across JVM settings for NUMA. Curiously I wanted to check if my CentOS server has NUMA capabilities or not. Is there a *ix command o

Answer 1

For Redhat 4,5,6 and 7 systems, one can try the following to determine if NUMA configuration is disabled:

numactl --show does not show multiple nodes

# numactl --show
policy: default
preferred node: current
physcpubind: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
cpubind: 0
nodebind: 0
membind: 0

or numactl --hardware does not list multiple nodes

# numactl --hardware
available: 1 nodes (0)
node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
node 0 size: 524163 MB
node 0 free: 505253 MB
node distances:
node   0
  0:  10