How to check the number of CPU cores in Linux?

In Linux, you can use "cat /proc/cpuinfo | grep "cpu cores" | uniq" to view the number of CPU cores, that is, the number of cores in each physical CPU.

Course recommendation: "linux course"

1. Introduction to knowledge points

1. The cpu information is recorded in /proc/cpuinfo.

2. Top in Linux is equivalent to the task manager under the win system, and can also be used to query

3. The total number of CPU cores = the number of physical CPUs * the number of each physical CPU Number of cores

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

2. Query command

查看CPU信息（型号）
[root@AAA ~]# cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c
     24         Intel(R) Xeon(R) CPU E5-2630 0 @ 2.30GHz
     
# 查看物理CPU个数
[root@AAA ~]# cat /proc/cpuinfo| grep "physical id"| sort| uniq| wc -l
2

# 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    : 6

# 查看逻辑CPU的个数
[root@AAA ~]# cat /proc/cpuinfo| grep "processor"| wc -l
24

What do these represent, then please look at the CPU architecture

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 core has Two logical processing units, two cores share the resources of one core, as follows:

From the above execution results, it proves that the CPU I am using has 2 * 6 = 12 cores, each core has 2 hyperthreads, so 24 logical cpu.

Related recommendations: "Linux Operation and Maintenance"

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