Display system topologies

You can understand the topology of a system by using a number of commands.

Procedure

  • To display an overview of your system topology: 
    $ numactl --hardware
     
    available: 4 nodes (0-3)
node 0 cpus: 0 4 8 12 16 20 24 28 32 36
node 0 size: 65415 MB
node 0 free: 43971 MB
[...]
  • To gather the information about the CPU architecture, such as the number of CPUs, threads, cores, sockets, and NUMA nodes: 
    $ lscpu
     
    Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                40
On-line CPU(s) list:   0-39
Thread(s) per core:    1
Core(s) per socket:    10
Socket(s):             4
NUMA node(s):          4
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 47
Model name:            Intel(R) Xeon(R) CPU E7- 4870  @ 2.40GHz
Stepping:              2
CPU MHz:               2394.204
BogoMIPS:              4787.85
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              30720K
NUMA node0 CPU(s):     0,4,8,12,16,20,24,28,32,36
NUMA node1 CPU(s):     2,6,10,14,18,22,26,30,34,38
NUMA node2 CPU(s):     1,5,9,13,17,21,25,29,33,37
NUMA node3 CPU(s):     3,7,11,15,19,23,27,31,35,39
  • To view a graphical representation of your system: 
    # dnf install hwloc-gui
     
    # lstopo

    The lstopo output

  • To view the detailed textual output: 
    # dnf install hwloc
     
    # lstopo-no-graphics
     
    Machine (15GB)
  Package L#0 + L3 L#0 (8192KB)
    L2 L#0 (256KB) + L1d L#0 (32KB) + L1i L#0 (32KB) + Core L#0
        PU L#0 (P#0)
        PU L#1 (P#4)
       HostBridge L#0
    PCI 8086:5917
        GPU L#0 "renderD128"
        GPU L#1 "controlD64"
        GPU L#2 "card0"
    PCIBridge
        PCI 8086:24fd
          Net L#3 "wlp61s0"
    PCIBridge
        PCI 8086:f1a6
    PCI 8086:15d7
Net L#4 "enp0s31f6"