Extracting hardware information from the kernel

• Extract information about NUMA nodes

   lscpu
  

• Extract information about caches

   grep . /sys/devices/system/cpu/cpu0/cache/index*/*
  

• Extract information about hypertwins

   cat /sys/devices/system/cpu/cpu0/topology/thread_siblings_list
   cat /sys/devices/system/cpu/cpu0/topology/core_id
  

• Get number of online CPUs vs total configured CPUs

   getconf _NPROCESSORS_ONLN
   getconf _NPROCESSORS_CONF