Find Out Server CPU Architecture(32 bit or 64 bit) in Linux

Some times it is very important to know whether the Server’s CPU Architecture is of 32 bit or 64 bit. One can determine using the file /proc/cpuinfo , as shown below :

[[email protected] ~]# cat /proc/cpuinfo | grep -i flags
flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx rdtscp lm constant_tsc up rep_good pni monitor ssse3 lahf_lm

Different Modes of CPU :

  • lm : Long Mode (64 bit)
  • tm : Transparent Mode ( 32 bit)
  • rm : Real Mode (16 bit)

So as per above output Server’s CPU is of 64 bit.

Determine whether a given Linux is 32 bit or 64 bit?

We can find the whether linux is 32 bit or 64 bit using commands like lscpu, ‘uname -m‘ and getconf

[[email protected] ~]# lscpu

Output will be something like below

Architecture:                     x86_64
CPU op-mode(s):              32-bit, 64-bit
Byte Order:                        Little Endian
CPU(s):                              4
On-line CPU(s) list:           0-3
Thread(s) per core:             2
Core(s) per socket:             2
Socket(s):                           1
NUMA node(s):                 1
Vendor ID:                         GenuineIntel
CPU family:                       6
Model:                               37
Stepping:                           5
CPU MHz:                        933.000
BogoMIPS:                       4787.82
Virtualization:                   VT-x
L1d cache:                         32K
L1i cache:                         32K
L2 cache:                          256K
L3 cache:                          3072K
NUMA node0 CPU(s):     0-3

[[email protected] ~]# uname -m

x86_64 –> 64-bit kernel
i686   –> 32-bit kernel

Above Command will display whether Kernel Version is 32 bit or 64 bit

[[email protected] ~]# getconf LONG_BIT

with help of getconf command we can also find whether the installed Linux is of 32-bit or 64-bit

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