$ uname -a
Linux hostname 2.6.9-89.0.20.ELsmp #1 SMP Tue Feb 2 18:35:37 EST 2010 i686 i686 i386 GNU/Linux
as there is i386 in end this means Kernel running is 32 bit. Still you can have 64 bit processor to check the same you need to see /proc/cpuinfo
$ 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 lm 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 lm constant_tsc pni monitor ds_cpl cid xtpr
- If lm is present that means CPU is 64 bit if it is not there than 32 bit. We hardly going to see 16 bit proccessor.
■lm means Long mode - 64 bit CPU
■Real mode 16 bit CPU
■Protected Mode is 32-bit CPU
under "flags" parameter u will see various values.
Among them . u will find one of them with name "tm(transparent mode)" or
"rm(real mode)" or "lm(long mode)"
1. rm tells ,it is a 16 bit processor
2. tm tells, it is a 32 bit processor
3. lm tells, it is a 64 bit processor
You can also try this to find out if your CPU/Processor is 32 bit or 64 bit:
# getconf LONG_BIT
32
Linux display CPU information
Now to get the number of CPU in your Linux server.
Need to give command
#cat /proc/cpuinfo
- If you have two CPUs in cpuinfo with the same physical id and core id, than – it is hyperthreading! (Hyperthreading is when One CPU is seen as 2 Logical CPU by OS, using Hyperthreading OS can send 2 instruction for processing to CPU)
- When you have all CPUs with different physical ids, than you have SMP,
- when you have CPUs with one physical id and different core ids – you have one multicore CPU. And so on…
