linux下怎么查看cpu核数

查看CPU型号

```shell script $ cat /proc/cpuinfo | grep name | sort | uniq model name : Intel(R) Xeon(R) CPU E5-2630 v3 @ 2.40GHz

###### 查看物理CPU数目

```shell script
$ cat /proc/cpuinfo | grep "physical id"
physical id    : 0
physical id    : 1
physical id    : 0
physical id    : 1
physical id    : 0
physical id    : 1
physical id    : 0
physical id    : 1
physical id    : 0
physical id    : 1
physical id    : 0
physical id    : 1
physical id    : 0
physical id    : 1
physical id    : 0
physical id    : 1
physical id    : 0
physical id    : 1
physical id    : 0
physical id    : 1
physical id    : 0
physical id    : 1
physical id    : 0
physical id    : 1
physical id    : 0
physical id    : 1
physical id    : 0
physical id    : 1
physical id    : 0
physical id    : 1
physical id    : 0
physical id    : 1

所有physical id都是0，可知有1个物理CPU。这里有0又有1所以是两个物理cpu。

也用管道排序去重后直接输出物理cpu的个数；

```shell script $ cat /proc/cpuinfo | grep "physical id" | sort | uniq | wc -l 2

###### 查看核数和逻辑CPU数目

```shell script
$ cat /proc/cpuinfo | grep "core id" | sort | uniq | wc -l
8
$ cat /proc/cpuinfo | grep "processor" | sort | uniq | wc -l
32

由图可知：2颗物理CPU，8核32线程；

如果不想自己算，也可以直接lscpu

```shell script $ lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 32 On-line CPU(s) list: 0-31 Thread(s) per core: 2 Core(s) per socket: 8 Socket(s): 2 NUMA node(s): 2 Vendor ID: GenuineIntel CPU family: 6 Model: 63 Stepping: 2 CPU MHz: 2400.001 BogoMIPS: 4799.30 Virtualization: VT-x L1d cache: 32K L1i cache: 32K L2 cache: 256K L3 cache: 20480K NUMA node0 CPU(s): 0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30 NUMA node1 CPU(s): 1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31

主要是看下面几个
```shell script
CPU(s):                32 #32个逻辑cpu
Thread(s) per core:    2
Core(s) per socket:    8
Socket(s):             2  #2个物理cpu