Number of physical and virtual processors

Linux and Unix-Like Red Hat
1

Hi,

i am trying to find out hpw many virtual and physical processors does any linux machine has:
output of /proc/cpuinfo is as below :

 
[root@VM172016001139 etc]# cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 26
model name      : Intel(R) Xeon(R) CPU           X5670  @ 2.93GHz
stepping        : 4
cpu MHz         : 2933.437
cache size      : 12288 KB
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss syscall nx rdtscp lm constant_tsc up nonstop_tsc arat pni ssse3 cx16 sse4_1 sse4_2 popcnt lahf_lm
bogomips        : 5866.87
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: [8]

using this info how can i figure out how many physical or virtual processor does any linux machine has...is der any better way to find out or any small script

2 
grep processor /proc/cpuinfo
3

Logical:

grep '^processor' /proc/cpuinfo

Physical:

awk '/^physical id/ && s[$NF]++==0' /proc/cpuinfo

Cores:

awk -F: '/^physical id/ {ph=$NF} /^core id/ && a[ph,$NF]++==0' /proc/cpuinfo

Pipe each to wc -l to get the number!

4

It is easy to find the number and type of physical processors.

What do you mean by virtual processors? As in virtual machines?

5

From the earlier posts, I'm assuming by virtual processors OP means processor threads.

6 
lscpu
7

Thanks a lot "MadeInGermany"...Could u please send me the output of below script which is used to find the number of physical processor of machine :

 
awk '/^physical id/ && s[$NF]++==0' /proc/cpuinfo

i only have virtual machines..so i just want to know how the output looks on physical machine

in fact for all the three commands output on physical machine

8

Actually, from a vm guest, this can be quite difficult. I mean, in most cases for most all hypervisor, any and all CPUs are virtual. The actually allocation given to a VM is often times only known to the hypervisor host itself and not to the guest.

On a physical box, it all depends.

If you have contemporary CPUs, and you have a relatively contemporary Linux, /proc/cpuinfo will likely show what you want. However, if you have older CPUs and/or older Linux, the information could be very inaccurate.

In your case, and this is a guess, looks like you've been assigned one virtual CPU.... what that means though, isn't well defined.

9

This is a system with 1 physical CPU, quad-core:

% grep '^processor' /proc/cpuinfo
processor       : 0
processor       : 1
processor       : 2
processor       : 3
% awk '/^physical id/ && s[$NF]++==0' /proc/cpuinfo
physical id     : 0
% awk -F: '/^physical id/ {ph=$NF} /^core id/ && a[ph,$NF]++==0' /proc/cpuinfo
core id         : 0
core id         : 1
core id         : 2
core id         : 3