/proc/cpuinfo

This virtual file identifies the type of processor used by your system. The following is an example of the output typical of /proc/cpuinfo:

processor : 0
vendor_id : GenuineIntel
cpu family : 15
model  : 2
model name : Intel(R) Xeon(TM) CPU 2.40GHz
stepping : 7 cpu
MHz  : 2392.371
cache size : 512 KB
physical id : 0
siblings : 2
runqueue : 0
fdiv_bug : no
hlt_bug  : no
f00f_bug : no
coma_bug : no
fpu  : yes
fpu_exception : yes
cpuid level : 2
wp  : yes
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
bogomips : 4771.02

• processor - Provides each processor with an identifying number. On systems that have one processor, only a 0 is present.

• cpu family - Authoritatively identifies the type of processor in the system. For an Intel-based system, place the number in front of "86" to determine the value. This is particularly helpful for those attempting to identify the architecture of an older system such as a 586, 486, or 386. Because some RPM packages are compiled for each of these particular architectures, this value also helps users determine which packages to install.
• model name - Displays the common name of the processor, including its project name.
• cpu MHz - Shows the precise speed in megahertz for the processor to the thousandths decimal place.
• cache size - Displays the amount of level 2 memory cache available to the processor.
• siblings - Displays the number of sibling CPUs on the same physical CPU for architectures which use hyper-threading.
• flags - Defines a number of different qualities about the processor, such as the presence of a floating point unit (FPU) and the ability to process MMX instructions.