How to determine if NUMA configuration is enabled or disabled?

Solution Verified - Updated -

Issue

  • How to determine if NUMA configuration is enabled or 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
cpubind: 0
nodebind: 0
membind: 0
  • numactl --hardware does not list multiple nodes
available: 1 nodes (0)
node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11
node 0 size: 65525 MB
node 0 free: 17419 MB
node distances:
node   0
  0:  10
  • grep -i numa /var/log/dmesg returns No NUMA configuration found
No NUMA configuration found
Faking a node at 0000000000000000-0000001027fff000
Bootmem setup node 0 0000000000000000-0000001027fff000
NODE_DATA [000000000000c000 - 000000000003ffff]
bootmap [0000000000100000 -  0000000000304fff] pages 205
  • Even with NUMA enabled, dmesg does not show any information of NUMA initialization.

Environment

  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

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