How do I find out my CPU architecture information under Linux operating systems?

You can use /proc/cpuinfo file or use the lscpu command to get info about CPU architecture. It will display information like:

Number of CPUs
NUMA nodes

Information about CPU caches,
CPU family, model and stepping.
in human-readable format. Alternatively, it can print out in parsable
format including how different caches are shared by different CPUs,
which can also be fed to other programs.

Open a terminal and type the following command:
$ less /proc/cpuinfo
$ lscpu
Sample outputs:

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
CPU(s):                8
Thread(s) per core:    2
Core(s) per socket:    4
CPU socket(s):         1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 30
Stepping:              5
CPU MHz:               1199.000
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              8192K

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