32 bit or 64 bit

PMP · 05-19-2009, 08:42 AM

is there any way/command to find that the linux machine is a 32 bit or 64 bit

linuxlover.chaitanya · 05-19-2009, 08:47 AM

You can find what version of kernel you are using by uname -a or uname -m

PMP · 05-19-2009, 08:48 AM

it says i686 now what type of machine is it

colucix · 05-19-2009, 08:53 AM

The uname command tells you if the kernel is 32-bit or 64-bit. i686 means 32-bit (otherwise it would be x86_64). To discover if the CPU is 32 or 64-bit do:

Code:

grep flags /proc/cpuinfo | grep lm

if output is null you have a 32-bit CPU, if output is non null the CPU is 64-bit. lm stats for "Long Mode" that is a feature of 64-bit machines.

repo · 05-19-2009, 08:53 AM

i686 means a 32 bit machine
x86_64 means 64 bit

Code:

grep flags /proc/cpuinfo

lm means Long mode - 64 bit CPU
Real mode 16 bit CPU
Protected Mode is 32-bit CPU

linuxlover.chaitanya · 05-19-2009, 08:53 AM

Mine also says i686 and is 32bit.

PMP · 05-19-2009, 09:24 AM

This is what i get when i do
grep flags /proc/cpuinfo

flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc pni monitor ds_cpl cid xtpr
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc pni monitor ds_cpl cid xtpr

uname -m gives
i686

Then it should be 64 bit if i am not worng

PMP · 05-19-2009, 09:25 AM

I am sorry the output was
grep flags /proc/cpuinfo | grep --color lm
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm

colucix · 05-19-2009, 09:30 AM

Quote:

Originally Posted by PMP

flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm

You have a 64-bit machine with a 32-bit OS (kernel) installed.

repo · 05-19-2009, 09:31 AM

the processor is 64 bit
the kernel is 32 bit

ermoreno · 05-19-2009, 09:35 AM

On my CentOS boxes I look in root and If I see a lib64 directory then it is 64 bit.