How to check number of CPUs are there in Linux system

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One can use any one of the following command to find the number of physical CPU cores including all cores on Linux:

  • lscpu command
  • cat /proc/cpuinfo
  • top or htop command
  • nproc command


Just run the lscpu command:

$ lscpu
$ lscpu | egrep 'Model name|Socket|Thread|NUMA|CPU\(s\)'
$ lscpu -p[root@shsdascn7i ~]# lscpuArchitecture:          x86_64CPU op-mode(s):        32-bit, 64-bitByte Order:            Little EndianCPU(s):                2On-line CPU(s) list:   0,1Thread(s) per core:    1Core(s) per socket:    1Socket(s):             2NUMA node(s):          1Vendor ID:             GenuineIntelCPU family:            6Model:                 158Model name:            Intel(R) Core(TM) i7-8700 CPU @ 3.20GHzStepping:              10CPU MHz:               3191.998CPU max MHz:           0.0000CPU min MHz:           0.0000BogoMIPS:              6383.99Hypervisor vendor:     VMwareVirtualization type:   fullL1d cache:             32KL1i cache:             32KL2 cache:              256KL3 cache:              12288KNUMA node0 CPU(s):     0,1Flags:                 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 pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf eagerfpu pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch epb fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 invpcid rtm rdseed adx smap xsaveopt dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp

The following line indicates that I have two physical CPUs:

CPU socket(s):         2
cat /proc/cpuinfo
OR
$ more /proc/cpuinfo[root@shsdascn7i ~]# cat /proc/cpuinfoprocessor       : 0vendor_id       : GenuineIntelcpu family      : 6model           : 158model name      : Intel(R) Core(TM) i7-8700 CPU @ 3.20GHzstepping        : 10microcode       : 0xb4cpu MHz         : 3191.998cache size      : 12288 KBphysical id     : 0siblings        : 1core id         : 0cpu cores       : 1apicid          : 0initial apicid  : 0fpu             : yesfpu_exception   : yescpuid level     : 22wp              : yesflags           : 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 pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf eagerfpu pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch epb fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 invpcid rtm rdseed adx smap xsaveopt dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_eppbogomips        : 6383.99clflush size    : 64cache_alignment : 64address sizes   : 42 bits physical, 48 bits virtualpower management:
processor       : 1vendor_id       : GenuineIntelcpu family      : 6model           : 158model name      : Intel(R) Core(TM) i7-8700 CPU @ 3.20GHzstepping        : 10microcode       : 0xb4cpu MHz         : 3191.998cache size      : 12288 KBphysical id     : 2siblings        : 1core id         : 0cpu cores       : 1apicid          : 2initial apicid  : 2fpu             : yesfpu_exception   : yescpuid level     : 22wp              : yesflags           : 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 pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf eagerfpu pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch epb fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 invpcid rtm rdseed adx smap xsaveopt dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_eppbogomips        : 6383.99clflush size    : 64cache_alignment : 64address sizes   : 42 bits physical, 48 bits virtualpower management:

Let us print cpu thread count:
$ echo "CPU threads: $(grep -c processor /proc/cpuinfo)"
$ grep 'cpu cores' /proc/cpuinfo | uniq
top - 15:54:25 up 9 days, 23:17,  2 users,  load average: 3.79, 2.87, 2.32Tasks: 491 total,   1 running, 490 sleeping,   0 stopped,   0 zombie%Cpu(s):  4.1 us,  6.0 sy,  0.0 ni, 29.1 id, 60.5 wa,  0.0 hi,  0.3 si,  0.0 stKiB Mem :  9810952 total,   133368 free,  7078720 used,  2598864 buff/cacheKiB Swap: 12697596 total, 10402480 free,  2295116 used.   794624 avail Mem
   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND 12341 apdascn+  20   0 1474108  81472   3028 S  16.9  0.8   0:39.14 java 28754 ordascn+  -2   0 2564436   2276   1876 S   1.3  0.0 293:00.05 ora_vktm_cdbebs    35 root      20   0       0      0      0 S   1.0  0.0   7:00.63 kswapd0 95348 apdascn+  20   0 2841624 751960      0 S   0.7  7.7   4:30.52 java     9 root      20   0       0      0      0 S   0.3  0.0   6:04.69 rcu_sched  9661 root      20   0       0      0      0 S   0.3  0.0   1:41.58 jbd2/sdd1-8  9673 root      20   0       0      0      0 S   0.3  0.0   1:55.88 jbd2/sdc1-8 10467 root      20   0       0      0      0 S   0.3  0.0   0:00.56 kworker/0:0 12186 apdascn+  20   0 1856860 290032    484 S   0.3  3.0   0:07.77 java 12524 root      20   0  162308   2660   1560 R   0.3  0.0   0:00.13 top 28770 ordascn+  20   0 2672080  31740  27912 S   0.3  0.3   4:42.92 ora_scmn_cdbebs 28802 ordascn+  20   0 2564440  35232  34200 S   0.3  0.4   5:37.36 ora_ckpt_cdbebs 97935 apdascn+  20   0 1754184 136872   1632 S   0.3  1.4   0:35.74 java 99473 apdascn+  20   0 2312444 865848      0 S   0.3  8.8   3:20.05 java117218 ordascn+  20   0 2568340 195068 189264 S   0.3  2.0   0:06.54 ora_m008_cdbebs     1 root      20   0  195224   3040    596 S   0.0  0.0   0:32.65 systemd     2 root      20   0       0      0      0 S   0.0  0.0   0:00.63 kthreadd     3 root      20   0       0      0      0 S   0.0  0.0   1:32.14 ksoftirqd/0     5 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/0:0H     7 root      rt   0       0      0      0 S   0.0  0.0   0:01.99 migration/0     8 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcu_bh    10 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 lru-add-drain    11 root      rt   0       0      0      0 S   0.0  0.0   0:15.58 watchdog/0

Another option is to run lovely htop:
$ htop
Execute nproc print the number of CPUs available on Linux
Let us print the number of installed processors on your system i.e core count:
$ nproc --all
$ echo "Threads/core: $(nproc --all)"
Sample outputs:
[root@shsdascn7i ~]# echo "Threads/core: $(nproc --all)"
Threads/core: 2

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