How to get the CPU information on Linux servers

Wondering how to view the exact specifications of the CPU on a Linux server? Don’t worry, we’ve got you covered.

Whether you’ve just spun up a new cloud server or are simply curious about the CPU information on your local machine, you can use the following commands on any Linux server to gain insights into the underlying CPU and its architecture and speed.

Get an overview

lscpu displays a quick overview of the CPU and its architecture.

lscpu

The output should look somewhat like below.

Architecture:            x86_64
  CPU op-mode(s):        32-bit, 64-bit
  Address sizes:         40 bits physical, 48 bits virtual
  Byte Order:            Little Endian
CPU(s):                  3
  On-line CPU(s) list:   0-2
Vendor ID:               AuthenticAMD
  Model name:            AMD EPYC Processor
    CPU family:          23
    Model:               49
    Thread(s) per core:  1
    Core(s) per socket:  3
    Socket(s):           1
    Stepping:            0
    BogoMIPS:            4890.80
    Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm rep_good n
                         opl cpuid extd_apicid tsc_known_freq pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm cmp_legacy
                         cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw topoext perfctr_core ssbd ibrs ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushop
                         t clwb sha_ni xsaveopt xsavec xgetbv1 clzero xsaveerptr wbnoinvd arat umip rdpid arch_capabilities
Virtualization features:
  Hypervisor vendor:     KVM
  Virtualization type:   full
Caches (sum of all):
  L1d:                   96 KiB (3 instances)
  L1i:                   96 KiB (3 instances)
  L2:                    1.5 MiB (3 instances)
  L3:                    16 MiB (1 instance)
NUMA:
  NUMA node(s):          1
  NUMA node0 CPU(s):     0-2
Vulnerabilities:
  Gather data sampling:  Not affected
  Itlb multihit:         Not affected
  L1tf:                  Not affected
  Mds:                   Not affected
  Meltdown:              Not affected
  Mmio stale data:       Not affected
  Retbleed:              Mitigation; untrained return thunk; SMT disabled
  Spec rstack overflow:  Mitigation; SMT disabled
  Spec store bypass:     Mitigation; Speculative Store Bypass disabled via prctl and seccomp
  Spectre v1:            Mitigation; usercopy/swapgs barriers and __user pointer sanitization
  Spectre v2:            Mitigation; Retpolines, IBPB conditional, STIBP disabled, RSB filling, PBRSB-eIBRS Not affected
  Srbds:                 Not affected
  Tsx async abort:       Not affected

In this case, the system is powered by 3x AMD EPYC Processor cores – or threads, depending on your system setup.

Get information about individual cores

If you wish to view the specifications for each processor core, you can do so by viewing the contents of the file /proc/cpuinfo using the Linux utility cat.

cat /proc/cpuinfo

The output should look somewhat like below.

processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 23
model           : 49
model name      : AMD EPYC Processor
stepping        : 0
microcode       : 0x1000065
cpu MHz         : 2445.404
cache size      : 512 KB
physical id     : 0
siblings        : 3
core id         : 0
cpu cores       : 3
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 mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm rep_good nopl cpuid extd_apicid tsc_known_freq pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm cmp_legacy cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw topoext perfctr_core ssbd ibrs ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 clzero xsaveerptr wbnoinvd arat umip rdpid arch_capabilities
bugs            : sysret_ss_attrs null_seg spectre_v1 spectre_v2 spec_store_bypass retbleed smt_rsb srso
bogomips        : 4890.80
TLB size        : 1024 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

processor       : 1
vendor_id       : AuthenticAMD
cpu family      : 23
model           : 49
model name      : AMD EPYC Processor
stepping        : 0
microcode       : 0x1000065
cpu MHz         : 2445.404
cache size      : 512 KB
physical id     : 0
siblings        : 3
core id         : 1
cpu cores       : 3
apicid          : 1
initial apicid  : 1
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 mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm rep_good nopl cpuid extd_apicid tsc_known_freq pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm cmp_legacy cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw topoext perfctr_core ssbd ibrs ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 clzero xsaveerptr wbnoinvd arat umip rdpid arch_capabilities
bugs            : sysret_ss_attrs null_seg spectre_v1 spectre_v2 spec_store_bypass retbleed smt_rsb srso
bogomips        : 4890.80
TLB size        : 1024 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

processor       : 2
vendor_id       : AuthenticAMD
cpu family      : 23
model           : 49
model name      : AMD EPYC Processor
stepping        : 0
microcode       : 0x1000065
cpu MHz         : 2445.404
cache size      : 512 KB
physical id     : 0
siblings        : 3
core id         : 2
cpu cores       : 3
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 mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm rep_good nopl cpuid extd_apicid tsc_known_freq pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm cmp_legacy cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw topoext perfctr_core ssbd ibrs ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 clzero xsaveerptr wbnoinvd arat umip rdpid arch_capabilities
bugs            : sysret_ss_attrs null_seg spectre_v1 spectre_v2 spec_store_bypass retbleed smt_rsb srso
bogomips        : 4890.80
TLB size        : 1024 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

As you can see, this way of getting CPU information shows you the CPU speed in MHz as well – which, in most cases, is probably what you’re looking for.

Conclusion

Viewing CPU information on Linux can be done natively in two different ways – using lscpu and by looking inside /proc/cpuinfo using the Linux utility cat.

Have any questions? Please let us know.

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