Ubuntu: How to see information about your system’s CPU

  To find out information about the CPU used in the system, we can use the following command:  
  This gives us useful information about the CPU, such as the number of physical cores, virtual threads, virtualization support and more. An example output from a Haswell Xeon system looks like:  
Architecture:          x86_64 CPU op-mode(s):        32-bit, 64-bit Byte Order:            Little Endian CPU(s):                8 On-line CPU(s) list:   0-7 Thread(s) per core:    2 Core(s) per socket:    4 Socket(s):             1 NUMA node(s):          1 Vendor ID:             GenuineIntel CPU family:            6 Model:                 60 Stepping:              3 CPU MHz:               800.000 BogoMIPS:              6784.21 Virtualisation:        VT-x L1d cache:             32K L1i cache:             32K L2 cache:              256K L3 cache:              8192K NUMA node0 CPU(s):     0-7
  The above CPU is a Xeon E3-1245V3. The CPU speed reading as 800MHz is correct – this is the speed that Intel’s Speed Step technology drops the CPU down to to conserve power when the system is idle.   This command can be really useful when you’re using an unfamiliar system or a virtual machine where you’re not sure what hardware – or virtual hardware – lies beneath the OS.