CPU - Linux

> Computer System > Computer - Central processing unit (CPU)

1 - About

CPU in a Linux context

Advertising

3 - How to

3.1 - get information on the CPU ?

3.1.1 - lscpu

lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                8
On-line CPU(s) list:   0-7
Thread(s) per core:    1
Core(s) per socket:    8
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 63
Model name:            Intel(R) Xeon(R) CPU E5-2673 v3 @ 2.40GHz
Stepping:              2
CPU MHz:               2394.462
BogoMIPS:              4788.92
Hypervisor vendor:     Microsoft
Virtualization type:   full
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              30720K
NUMA node0 CPU(s):     0-7

3.1.2 - cpuinfo

1 block of information by core

cat  /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 63
model name      : Intel(R) Xeon(R) CPU E5-2673 v3 @ 2.40GHz
stepping        : 2
microcode       : 0xffffffff
cpu MHz         : 2394.462
cache size      : 30720 KB
physical id     : 0
siblings        : 8
core id         : 0
cpu cores       : 8
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 15
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology eagerfpu pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm fsgsbase bmi1 avx2 smep bmi2 erms xsaveopt
bogomips        : 4788.92
clflush size    : 64
cache_alignment : 64
address sizes   : 44 bits physical, 48 bits virtual
power management:

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 63
model name      : Intel(R) Xeon(R) CPU E5-2673 v3 @ 2.40GHz
stepping        : 2
microcode       : 0xffffffff
cpu MHz         : 2394.462
cache size      : 30720 KB
physical id     : 0
siblings        : 8
core id         : 1
cpu cores       : 8
apicid          : 1
initial apicid  : 1
fpu             : yes
fpu_exception   : yes
cpuid level     : 15
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology eagerfpu pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm fsgsbase bmi1 avx2 smep bmi2 erms xsaveopt
bogomips        : 4788.92
clflush size    : 64
cache_alignment : 64
address sizes   : 44 bits physical, 48 bits virtual
power management:

..................
.................

You can see the cpu cache

Querying this output:

  • processor and core id
egrep 'processor|core id' /proc/cpuinfo

3.2 - The number of processor ? (Core)

To display the number of existing CPUs, enter the following command:

grep processor /proc/cpuinfo | wc -l

or

grep -c ^processor /proc/cpuinfo

With:

Advertising

3.3 - The architecture

You can determine the architecture address mode with the uname command

uname -p
x86_64
i686

If the command return unknown:

uname -a
Linux ssh1.60gp.ha.ovh.net 3.14.51-grsec-hosting-3.14-grsec-ipv6-64-vps #1 
SMP Mon Sep 28 15:14 UTC 2015 x86_64 GNU/Linux
computer/cpu/linux.txt · Last modified: 2019/01/02 14:39 by gerardnico