How to determine Linux kernel architecture?

http://unix.stackexchange.com/questions/12453/how-to-determine-linux-kernel-architecture

Actually, I was looking for a list of architectures and I found this article that answers your question. In regards to uname -m:

x86_64 GNU/Linux indicates that you’ve a 64bit Linux kernel running. If you use see i386/i486/i586/i686 it is a 32 bit kernel.

To determine if the hardware is capable of running a 64-bit kernel

grep flags /proc/cpuinfo

Look for the following in the output (all flags retrieved from this stackoverflow answer for the same question )

  • lm flag means Long mode cpu – 64 bit CPU
  • tm flag means Protected mode – 32-bit CPU
  • rm flag means Real Mode – 16 bit CPU
shareimprove this answer

 

http://www.cyberciti.biz/faq/linux-how-to-find-if-processor-is-64-bit-or-not/

You need to use the following commands to find out information about Linux kernel and CPU architecture:

  1. getconf LONG_BIT command: This command check if the OS (kernel) is 32 bit or 64 bit.
  2. uname command: This command prints system information including kernel version and whether kernel (os) is 32 bit or 64 bit.
  3. /proc/cpuinfo file: Use this file to determine if CPU is 64 bit or 32 bit i.e. find out CPU architecture.
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