How many bits is linux x86?

linux x86 is 32-bit, while x86_64, x64 and AMD64 are all 64-bit; x86 refers to a 32-bit instruction set developed by Intel. It started in the 386 era and has been used to this day. A CISC instruction set, all early Intel CPUs, and early AMD CPUs support this instruction set.

#The operating environment of this tutorial: linux5.9.8 system, Dell G3 computer.

How many bits are linux x86?

Linux kernel version and system version information viewing and the difference between x86 and x86_64

1. x86 and x86_64

The main difference between x86 and x86_64 is the 32-bit and 64-bit problem.

x86 => 32-bit

x86_64 and x64 and AMD64=> are all 64-bit

　x86 refers to a 32-bit instruction set developed by Intel. Starting from the 386 era and still in use today, it is a CISC instruction set. All early Intel CPUs and early AMD CPUs support this instruction set. It is called "IA-32" in Ntel official documents

x84_64 is when x86 CPUs start to move towards 64-bit. There are two options: 1. Backward compatibility with x86. 2. Completely redesign the instruction set and not compatible with x86. AMD jumped the gun and was the first to create a commercial x86-compatible CPU before Intel, which AMD called AMD64. Intel chose to design a new 64-bit instruction set that is not compatible with x86, called IA-64, but it is a step later than AMD. Because it is a newly designed CPU, there is no compiler, and it does not support windows. Later, it had to Even though the timing was behind, it also started to support the AMD64 instruction set, but it was renamed x86_64, which means it is a 64 extension of the x86 instruction set. In other words, in fact, x86_64, x64, and AMD64 are basically the same thing.

2. View Linux kernel information

[root@localhost ~]# cat /proc/version
Linux version 2.6.32-642.el6.x86_64 (mockbuild@worker1.bsys.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-17) (GCC) ) #1 SMP Tue May 10 17:27:01 UTC 2016
[root@localhost ~]# uname -r
2.6.32-642.el6.x86_64
[root@localhost ~]# uname -a
Linux localhost.localdomain 2.6.32-642.el6.x86_64 #1 SMP Tue May 10 17:27:01 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

uname -r What does the result displayed mean?

2.6.32-642.el6.x86_64

2: —->Major version number

6: —–>Minor version number 6 represents the stable version

32: —–>Revision number, represents the number of revisions

3. Check the Linux version information

[root@localhost ~]# cat /etc/issue
CentOS release 6.8 (Final)
Kernel \r on an \m
[root@localhost ~]# cat /etc/redhat-release
CentOS release 6.8 (Final)
[root@localhost ~]# file /bin/bash
/bin/bash: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.18, stripped
[root@localhost ~]# file /bin/cat
/bin/cat: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.18, stripped

4. Check the number of bits in the current system

It can be seen from the above that uname -r cat /proc/version uname -a can check the kernel. The number of bits, file /bin/bash and file /bin/cat can check the current number of bits of your system. The corresponding result is x86_64, which is 64 bits.

But there is a simpler and cruder method:

[root@localhost ~]# getconf LONG_BIT
64

The result displayed is directly the number of digits.

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