What does linux cpu mean?

In Linux, cpu refers to the "central processing unit", which is the final execution unit for information processing and program execution. The main job of the CPU is to process and calculate data, so the CPU's computing speed, main frequency, cache, number of cores and other parameters determine the quality of the CPU; the total number of cores of the CPU is "the number of physical CPUs * the cores of each physical CPU" number".

#The operating environment of this tutorial: linux5.9.8 system, Dell G3 computer.

In Linux, CPU refers to the "central processing unit". As the computing and control core of the computer system, it is the final execution unit for information processing and program execution. Since its creation, CPU has made great progress in logical structure, operating efficiency and function extension.

CPU is one of the most important and core things in a computer. The main job of the CPU is to process and calculate data. Therefore, the CPU computing speed, main frequency, cache, and number of cores determine the quality of the CPU. The higher the main frequency of the CPU, the larger the cache, and the greater the number of cores. , such a CPU runs very fast, and the faster it processes graphics and image files, the more expensive it will be.

The basic architecture of the CPU:

Multiple physical CPUs, the CPU communicates through the bus, and the efficiency is relatively low, as follows:

Multi-core CPU, different cores communicate through L2 cache, storage and peripherals communicate with the CPU through the bus, as follows:

Multi-core hyperthreading, each The core has two logical processing units, and the two cores share the resources of one core, as follows:

View the various parameters of the CPU in the Linux system ( Number of physical CPUs, number of cores, number of logical CPUs)

Total number of CPU cores = Number of physical CPUs * Number of cores per physical CPU

Total number of logical CPUs = Number of physical CPUs* Number of cores per physical CPU* Number of hyperthreads

#查看CPU信息（型号）
[root@AAA ~]# cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c
     4  Intel(R) Xeon(R) CPU E5-2403 v2 @ 1.80GHz

# 查看物理CPU个数
[root@AAA ~]# cat /proc/cpuinfo| grep "physical id"| sort| uniq| wc -l
1

# 查看每个物理CPU中core的个数(即核数)
[root@AAA ~]# cat /proc/cpuinfo| grep "cpu cores"| uniq
cpu cores    : 4

# 查看逻辑CPU的个数
[root@AAA ~]# cat /proc/cpuinfo| grep "processor"| wc -l
4

#查看CPU的各项指标
[root@AAA ~]# lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                4
On-line CPU(s) list:   0-3
Thread(s) per core:    1
Core(s) per socket:    4
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 62
Stepping:              4
CPU MHz:               1800.057
BogoMIPS:              3600.11
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              10240K
NUMA node0 CPU(s):     0-3

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