Calculate number of NUMA nodes on the current host.

numa-nodes.sh

#!/bin/bash
#
# Calculate the number of NUMA nodes on the current host.
#
#   iabwi8:~# number-of-numa-nodes
#   4
#
function number-of-numa-nodes() {
  ls --directory /sys/devices/system/node/node* | wc --lines
}
# Output an iterable sequence of all of the NUMA nodes on the current host.
#
# This function is useful for iterating over all of the NUMA nodes on the host
# if you say need to calculate the total number of hugepages available.
#
#   iabwi8:~# echo $(numa-nodes)
#   0 1 2 3
#
function numa-nodes() {
  seq 0 $(($(number-of-numa-nodes) - 1))
}