Ubuntu: How to find number of CPU cores

How to find out number of CPU cores, including virtual cores on UBUNTU in command line?

Simple way to read information about CPU is to use command lscpu. It will give you general information about your linux system.


$ lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                2
On-line CPU(s) list:   0,1
Thread(s) per core:    1
Core(s) per socket:    2
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 60
Model name:            Intel(R) Pentium(R) CPU 3550M @ 2.30GHz
Stepping:              3
CPU MHz:               2276.460
CPU max MHz:           2300.0000
CPU min MHz:           800.0000
BogoMIPS:              4589.17
Virtualisation:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              2048K
NUMA node0 CPU(s):     0,1
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 pbe 
syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good 
nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl 
vmx est tm2 ssse3 sdbg cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt 
tsc_deadline_timer xsave rdrand lahf_lm abm epb invpcid_single ssbd ibrs 
ibpb stibp kaiser tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust 
erms invpcid xsaveopt dtherm arat pln pts flush_l1d

How to find information about each CPU core

It is also possible to read information about each core by command cat /proc/cpuinfo. It will produce something like this:


$ cat /proc/cpuinfo
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 60
model name	: Intel(R) Pentium(R) CPU 3550M @ 2.30GHz
stepping	: 3
microcode	: 0x25
cpu MHz		: 799.968
cache size	: 2048 KB
physical id	: 0
siblings	: 2
core id		: 0
cpu cores	: 2
apicid		: 0
initial apicid	: 0
fpu		: yes
fpu_exception	: yes
cpuid level	: 13
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 pbe syscall nx 
pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology 
nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 
sdbg cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer xsave 
rdrand lahf_lm abm epb invpcid_single ssbd ibrs ibpb stibp kaiser tpr_shadow 
vnmi flexpriority ept vpid fsgsbase tsc_adjust erms invpcid xsaveopt dtherm 
arat pln pts flush_l1d
bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf
bogomips	: 4589.17
clflush size	: 64
cache_alignment	: 64
address sizes	: 39 bits physical, 48 bits virtual
power management:

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 6
model		: 60
model name	: Intel(R) Pentium(R) CPU 3550M @ 2.30GHz
stepping	: 3
microcode	: 0x25
cpu MHz		: 801.675
cache size	: 2048 KB
physical id	: 0
siblings	: 2
core id		: 1
cpu cores	: 2
apicid		: 2
initial apicid	: 2
fpu		: yes
fpu_exception	: yes
cpuid level	: 13
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 pbe syscall nx 
pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology 
nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 
sdbg cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer xsave 
rdrand lahf_lm abm epb invpcid_single ssbd ibrs ibpb stibp kaiser tpr_shadow 
vnmi flexpriority ept vpid fsgsbase tsc_adjust erms invpcid xsaveopt dtherm 
arat pln pts flush_l1d
bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf
bogomips	: 4589.17
clflush size	: 64
cache_alignment	: 64
address sizes	: 39 bits physical, 48 bits virtual
power management:

Ubuntu: How to find number of CPU cores

How to find information about CPU

How to find information about each CPU core

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	My Coding > Operational systems > Ubuntu > Ubuntu FAQ > Ubuntu: How to find number of CPU cores Ubuntu: How to find number of CPU cores How to find information about CPU How to find out number of CPU cores, including virtual cores on UBUNTU in command line? Simple way to read information about CPU is to use command lscpu. It will give you general information about your linux system. $ lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 2 On-line CPU(s) list: 0,1 Thread(s) per core: 1 Core(s) per socket: 2 Socket(s): 1 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 60 Model name: Intel(R) Pentium(R) CPU 3550M @ 2.30GHz Stepping: 3 CPU MHz: 2276.460 CPU max MHz: 2300.0000 CPU min MHz: 800.0000 BogoMIPS: 4589.17 Virtualisation: VT-x L1d cache: 32K L1i cache: 32K L2 cache: 256K L3 cache: 2048K NUMA node0 CPU(s): 0,1 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 pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer xsave rdrand lahf_lm abm epb invpcid_single ssbd ibrs ibpb stibp kaiser tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust erms invpcid xsaveopt dtherm arat pln pts flush_l1d How to find information about each CPU core It is also possible to read information about each core by command cat /proc/cpuinfo. It will produce something like this: $ cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 60 model name : Intel(R) Pentium(R) CPU 3550M @ 2.30GHz stepping : 3 microcode : 0x25 cpu MHz : 799.968 cache size : 2048 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 13 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 pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer xsave rdrand lahf_lm abm epb invpcid_single ssbd ibrs ibpb stibp kaiser tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust erms invpcid xsaveopt dtherm arat pln pts flush_l1d bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf bogomips : 4589.17 clflush size : 64 cache_alignment : 64 address sizes : 39 bits physical, 48 bits virtual power management: processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 60 model name : Intel(R) Pentium(R) CPU 3550M @ 2.30GHz stepping : 3 microcode : 0x25 cpu MHz : 801.675 cache size : 2048 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 2 initial apicid : 2 fpu : yes fpu_exception : yes cpuid level : 13 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 pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer xsave rdrand lahf_lm abm epb invpcid_single ssbd ibrs ibpb stibp kaiser tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust erms invpcid xsaveopt dtherm arat pln pts flush_l1d bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf bogomips : 4589.17 clflush size : 64 cache_alignment : 64 address sizes : 39 bits physical, 48 bits virtual power management: Published: 2021-11-16 09:14:23 Updated: 2021-11-16 09:16:06	Last 10 artitles 2023-12-25 01:48:38 - In-place and out-place Numpy functions 2023-12-25 00:58:08 - First order ordinary differential equations 2023-12-25 00:22:15 - How to increase swap space in Ubuntu 2023-12-24 04:03:12 - How to accelerate math calculations with Numba and Cython 2023-12-19 00:38:20 - 3 ways of function caching in Python 2023-12-19 00:16:55 - Accelerating Python 2023-12-16 12:26:55 - BioPython 2023-12-02 11:05:34 - Reading FITS files with astropy 2023-12-02 05:23:42 - Astropy 2023-12-01 00:33:16 - Circle length calculation with the Monte-Carlo method 9 popular artitles Python Panda (3438) Python NumPy (2979) Python DICTionary HowTo (1591) Python LIST HowTo (1470) Python (1422) Python Generators (1281) Python: How to make absolute links in BeautifulSoup (1084) Programming language (967) NumPy: What the difference between mgrid and meshgrid (946)
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