How to check how many CPUs there are in Linux

View method: 1. Execute the "cat /proc/cpuinfo |grep "physical id"|sort |uniq|wc -l" command; 2. Execute the "cat /proc/cpuinfo |grep "processor"| wc -l" command.

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

linux Check the cpu of the machine

1. Check the number of physical CPUs

cat /proc/cpuinfo |grep "physical id"|sort |uniq|wc -l

2. Check the number of logical CPUs Number (number of threads)

cat /proc/cpuinfo |grep "processor"|wc -l

3. Check the number of cores of the CPU

cat /proc/cpuinfo |grep "cores"|uniq

4. Check the main frequency of the CPU

cat /proc/cpuinfo |grep MHz|uniq

Extended knowledge:

uname -a

Linux euis1 2.6.9-55.ELsmp #1 SMP Fri Apr 20 17:03:35 EDT 2007 i686 i686 i386 GNU/Linux
(查看当前操作系统内核信息)

cat /etc/issue | grep Linux

Red Hat Enterprise Linux AS release 4 (Nahant Update 5)
(查看当前操作系统发行版信息)

cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c

      8  Intel(R) Xeon(R) CPU            E5410   @ 2.33GHz
(看到有8个逻辑CPU, 也知道了CPU型号)

cat /proc/cpuinfo | grep physical | uniq -c

      4 physical id      : 0
      4 physical id      : 1
(说明实际上是两颗4核的CPU)

getconf LONG_BIT

32
(说明当前CPU运行在32bit模式下, 但不代表CPU不支持64bit)

cat /proc/cpuinfo | grep flags | grep ' lm ' | wc -l

8
(结果大于0, 说明支持64bit计算. lm指long mode, 支持lm则是64bit)

Related recommendations: "Linux Video Tutorial"

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