I have intel celeron d 3.06ghz processor . Now I am using 32 bit Ubuntu and I wish to upgrade to 64 bit Ubuntu if my processor allow. My doubt is how to identify 64 bit processor with cat /proc/cpuinfo command. it shows
clflush size : 64
Does my processor support 64 bit OS ?
4 Answers
Use the lscpu command.
32bit example output:
$ lscpu
Architecture: i686
CPU op-mode(s): 32-bit
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 4
Core(s) per socket: 1
Socket(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 26
Stepping: 5
CPU MHz: 2260.998
BogoMIPS: 4521.99
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 8192K64bit example:
$ lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
CPU(s): 4
Thread(s) per core: 1
Core(s) per socket: 4
CPU socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 23
Stepping: 6
CPU MHz: 2327.533
Virtualization: VT-x
L1d cache: 32K
L1i cache: 32K
L2 cache: 6144KThe flags section will contain lm if you have a Intel 64-/AMD 64-capable CPU. Other 64-bit architectures should have similar flags that you can look for.
To know if the installed Ubuntu is of 32 or 64 bits:
a) getconf LONG_BIT
b) uname -m
If it shows i686 or i386 it means 32 bits. If it shows x86_64 it means 64 bits.
If the CPU is of 32 bits Ubuntu must be of 32 bits. If the CPU is of 64 bits it can work in 64 or 32 bits. So we can choose: Ubuntu can be of 32 bits or of 64 bits.
To know if the CPU is of 32 or 64 bits:
a) grep -w lm /proc/cpuinfo
If we see lm in red is of 64 bits. Otherwise is of 32 bits.
b) sudo lshw | grep "description: CPU" -A 12 | grep width
It says clearly what we want to know.
2lscpuNot using cat /proc/cpuinfo , but it will do.
If you, for some reason, really need to use that file, try:
grep flags /proc/cpuinfoIf you can find a "lm" flag, you are running a 64bit cpu.
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