If you have asked yourself, “Do I have a 64-bit processor?”, then here are several ways to find out:
uname
# uname -p x86_64
cpuinfo
# cat /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 syscall lm constant_tsc arch_perfmon pebs bts rep_good pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm tpr_shadow bogomips : 4255.87 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual
The “lm” flag stands for Long Mode.
You can read more in this file:
/usr/src/kernels/#.#.#-#.#.fc11.x86_64/arch/x86/include/asm/cpufeature.h
#define X86_FEATURE_LM (1*32+29) /* Long Mode (x86-64) */
lshw
# lshw
*-cpu
description: CPU
product: Intel(R) Core(TM)2 CPU 6420 @ 2.13GHz
width: 64 bits
From the lshw manpage:
lshw is a small tool to extract detailed information on the hardware configuration of the machine. It can report exact memory configuration, firmware version, mainboard configuration, CPU version and speed, cache configuration, bus speed, etc. on DMI-capable x86 or IA-64 systems and on some PowerPC machines (PowerMac G4 is known to work).
