View CPU information in CentOS

View CPU information in CentOS
We can use/proc/cpuinfo to view CPU information. This file contains the data section of each processor on the system. There are six entries in the/proc/cpuinfo description for multi-core and super-thread (HT) technical checks: processor, vendor id, physical id, siblings, core id and cpu cores.
(1) processor: including the unique identifier of the logical processor.
(2) physical id: including the unique identifier of each physical encapsulation.
(3) core id: the unique identifier of each core.
(4) siblings: lists the number of logical processors in the same physical encapsulation.
(5) cpu cores: contains the number of cores in the same physical encapsulation.
(6) If the processor is an Intel processor, the string in the vendor id entry is GenuineIntel.

All logical processors with the same physical id share the same physical outlet. Each physical id represents a unique physical encapsulation. Siblings indicates the number of logical processors on this physical encapsulation. Logical Processors may or may not support hyper-threading (HT) technology. Each core id represents a unique processor kernel. All logical processors with the same core id are located on the same processor kernel. If more than one logical processor has the same core id and physical id, The system supports hyper-threading (HT) technology. If two or more logical processors have the same physical id but the core id is different, it indicates that this is a multi-core processor. The cpu cores entry can also indicate whether multiple kernels are supported.


I. Differences between i386 i586 i686
They are applicable to intel i386, i586, and i686 compatible instruction sets. Generally, machines with higher grades can accept rpm files of lower grades.
I386-almost all X86 platforms, whether it is the old pentum or the new pentum-IV and the K7 system CPU, can work normally, I refers to Intel compatible CPU, as for 386, It is the CPU level.
I586-is a 586-level computer, including the first generation of pentum mmx cpu, AMD K5, and K6 system CPU (socket7 pin.
I686-pentum 2 after the Intel system CPU and K7 after the CPU level belongs to this 686 level.
You can query your CPU level through the/proc/cpuinfo file.


Ii. View CPU Information

We can view CPU information through the/proc/cpuinfo file.

[Root @ qs-wgdb-1 proc] # more/proc/cpuinfo
Processor: 0
Vendor_id: GenuineIntel
Cpu family: 6
Model: 44
Model name: Intel (R) Xeon (R) CPUE5630 @ 2.53 GHz
Stepping: 2
Cpu MHz: 2527.071
Cache size: 12288 KB
Physical id: 1
Siblings: 8
Core id: 0
Cpu cores: 4
Apicid: 32
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 limit 36 clflush dt
S acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni
Monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
Bogomips: 5054.14
Clflush size: 64
Cache_alignment: 64
Address sizes: 40 bits physical, 48 bits virtual
Power management: [8]

Processor: 1
Vendor_id: GenuineIntel
Cpu family: 6
Model: 44
Model name: Intel (R) Xeon (R) CPUE5630 @ 2.53 GHz
Stepping: 2
Cpu MHz: 2527.071
Cache size: 12288 KB
Physical id: 0
Siblings: 8
Core id: 0
Cpu cores: 4
Apicid: 0
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 limit 36 clflush dt
S acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni
Monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
Bogomips: 5054.02
Clflush size: 64
Cache_alignment: 64
Address sizes: 40 bits physical, 48 bits virtual
Power management: [8]

Processor: 2
Vendor_id: GenuineIntel
Cpu family: 6
Model: 44
Model name: Intel (R) Xeon (R) CPUE5630 @ 2.53 GHz
Stepping: 2
Cpu MHz: 2527.071
Cache size: 12288 KB
Physical id: 1
Siblings: 8
Core id: 1
Cpu cores: 4
Apicid: 34
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 limit 36 clflush dt
S acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rdtscp lm constant_tsc ida nonstop_tsc arat pni
Monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
Bogomips: 5054.04
Clflush size: 64
Cache_alignment: 64
Address sizes: 40 bits physical, 48 bits virtual
Power management: [8]

....

Processor: 14
Vendor_id: GenuineIntel
Cpu family: 6
Model: 44
Model name: Intel (R) Xeon (R) CPUE5630 @ 2.53 GHz
Stepping: 2
Cpu MHz: 2527.071
Cache size: 12288 KB
Physical id: 1
Siblings: 8
Core id: 10
Cpu cores: 4
Apicid: 53
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 limit 36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx limit rdtscp lm limit ida limit arat pni monitor vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
Bogomips: 5054.03
Clflush size: 64
Cache_alignment: 64
Address sizes: 40 bits physical, 48 bits virtual
Power management: [8]

Processor: 15
Vendor_id: GenuineIntel
Cpu family: 6
Model: 44
Model name: Intel (R) Xeon (R) CPUE5630 @ 2.53 GHz
Stepping: 2
Cpu MHz: 2527.071
Cache size: 12288 KB
Physical id: 0
Siblings: 8
Core id: 10
Cpu cores: 4
Apicid: 21
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 limit 36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx limit rdtscp lm limit ida limit arat pni monitor vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
Bogomips: 5053.98
Clflush size: 64
Cache_alignment: 64
Address sizes: 40 bits physical, 48 bits virtual
Power management: [8]



Iii. Correlation Analysis

3.1 view server bits
[Root @ qs-wgdb-1 proc] # arch
X86_64

X86_64: 64-bit System
X86: 32-bit System

3.2 check whether the CPU supports 64bit
[Root @ qs-wgdb-1 proc] # cat/proc/cpuinfo | grep flags | grep 'lm '| wc-l
16

If the result is greater than 0, 64bit computing is supported. lm indicates long mode, and lm indicates 64bit.

3.3 logical CPU count:
[Root @ qs-wgdb-1 proc] # cat/proc/cpuinfo | grep 'processor '| wc-l
16

Note: Here is the logical CPU. The processor we see in cpuinfo.


3.4 physical CPU count:
[Root @ qs-wgdb-1 proc] # cat/proc/cpuinfo | grep 'physical id' | sort | uniq | wc-l
2

This refers to the physical CPU, which is the two CPU slots we see on the server.


3.5 Number of cores in each physical CPU:
[Root @ qs-wgdb-1 proc] # cat/proc/cpuinfo | grep 'cpu cores' | wc-l
16

3.6 is hyper-threading:
If two logical CPUs have the same core id, hyper-threading is enabled. The number of logical CPUs (possibly core, threads, or both) in each physical CPU.

[Root @ qs-wgdb-1 proc] # cat/proc/cpuinfo | grep 'siblings'
Siblings: 8
Siblings: 8
Siblings: 8
Siblings: 8
Siblings: 8
Siblings: 8
Siblings: 8
Siblings: 8
Siblings: 8
Siblings: 8
Siblings: 8
Siblings: 8
Siblings: 8
Siblings: 8
Siblings: 8
Siblings: 8



Iv. CPUID

CPUID is a single code developed by the CPU manufacturer to identify different types of cpus. CPUID is defined differently for CPUs of different manufacturers; for example, "0F24" (Inter processor) and "681H" (AMD processor) can be used to determine the type of CPU Based on these digital codes. This is the CPUID in the general sense.
Because the computer uses a hexadecimal system, CPUID is also expressed in hexadecimal format. The cpuid of the Inter processor consists of four numbers, such as "0F24". The numbers are Type, Family, and Mode from left to right) and Stepping (step number ).
Since CPUID is a "068X" processor, Inter also adds the BrandID to help the application identify the CPU type, therefore, the Pentium and Celerom processors cannot be correctly identified based on the "068X" CPUID. You must use BrandID to perform segments.
AMD processors are generally divided into three types: Family, Mode, and Stepping, for example, 681 ).


Type)
The type identifier is used to distinguish whether an INTEL microprocessor is installed by an end user, or by a professional personal computer system integrator, service company, or manufacturer; the number "1" indicates that the tested microprocessor is used by the user for installation; the microprocessor tested by the digital "0" mark is used for installation by professional personal computer system integrators, service companies, or producers. The INTEL processor type identifier we usually use is "0", and "0F24" CPUID belongs to this type.

Family)
The series identifier can be used to determine which product the processor belongs. For example, 6 series INTEL processors include PentiumPro, PentiumII, PentiumIIXeon, PentiumIII and PentiumIIIXeon processors. The 5th generation includes the Pentium processor and the Pentium processor using MMX technology. AMD's 6 series actually refer to K7 series CPUs, DURON and ATHION. The generation of the latest INTELPentium4 series processor (including Celerom processors with the same core) is "F"

Mode (model)
Model identifiers can be used to determine the processor production technology and the generation (or core) Design of the series. Models and series are usually used in concert with each other, used to determine which type of processor the computer is installed on. For example, determine whether the Celerom processor is the core of Coppermine or Tualutin; whether the AthlonXP processor is the core of Paiomino or Thorouhgbred.

Stepping (step number)
Step numbers are used to identify the design or production version of the processor, which helps to control and track processor changes. Step numbers allow end users to more specifically identify the version of the processor installed in their systems, determine the internal design or production features of the microprocessor. The step number is like a small version number of the processor. For example, if the CPUID is "686" and "686A", it is like the relationship between WINZIP8.0 and 8.1. The step number is closely related to the core step. For example, the PentiumIII processor with the CPUID of "686" is the core of cCO, while "686A" indicates the core of the updated version cD0.

BrandID)
INTEL introduced BrandID as an auxiliary Recognition Method for CPU from the core processor of Coppermine. For example, we can use BrandID to identify whether the processor is Celerom or Pentium4.



Summary:
From the/proc/cpuinfo file, we can see the cpu information. There are two concepts. One is the number of physical CPUs and the number of logical CPUs. Physical CPU is the number of CPUs we can see in the card slot on the motherboard. This can be determined by physical id. There are several different physical IDs and there are several physical CPUs. The number of logical CPUs can be determined by processor. This is relatively simple. If there are two physical encapsulated CPUs, there are 16 logical CPUs. Each physical package contains eight logical CPUs.