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3 Ways to check CPU Cores in Linux

Table of Contents

 

In this blog post, we will discuss 3 different ways to check the number of cpu cores in Linux. This is useful information to have if you are trying to optimize your system for performance. Each method has its own advantages and disadvantages, so be sure to read through all of them before choosing the one that is best for you. Let’s get started!

The following commands can be used to check CPU cores in Linux.

  • cat /proc/cpuinfo | grep “cpu cores” | uniq |sed -n 1p |awk ‘{print $4}’
  • lscpu
  • dmidecode -t processor | grep “Core Count”

 

understanding CPU cores in Linux

When you are trying to optimize your system for performance, it is important to understand the concept of CPU cores. In Linux, a CPU core is essentially a processor.This means that, if you have multiple CPU cores, your system can process multiple tasks at the same time. This can result in a significant increase in performance.

understanding CPU cores and hyper threading in Linux

Hyper threading is a feature that was first introduced in Intel processors. It allows a single CPU core to process multiple tasks at the same time by creating virtual cores. This can be useful if you are trying to optimize your system for performance, as it can increase the number of tasks that can be processed simultaneously. However, it is important to note that not all processors support hyper threading.

understanding threads per core in Linux

In Linux, threads per core is a way of measuring the number of threads that can be processed simultaneously on a single CPU core. This is different than the number of CPU cores, as it measures the number of tasks that can be processed at the same time, rather than the number of processors. There are 2 threads per core in most of the current CPU architecture.

  • The number of CPU cores = sockets * Core per socket
  • The number of vCPU = CPU cores * threads per core

 

Check CPU cores from /proc/cpuinfo File in Linux

The best way to check the number of CPU cores in Linux is by looking at the /proc/cpuinfo file. Open the terminal and run this command: cat /proc/cpuinfo | grep “cpu cores” | uniq |sed -n 1p |awk ‘{print $4}’. It will list the number of CPU cores on your system.

This file contains a lot of information about the cpu, including the vendor_id, model name etc. To view it, just type the following command into your terminal:

cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 85
model name : Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz
stepping : 7
microcode : 0x500320a
cpu MHz : 3109.590
cache size : 36608 KB
physical id : 0

$ cat /proc/cpuinfo | grep “cpu cores” | uniq |sed -n 1p |awk ‘{print $4}’
2

Check CPU cores with lscpu command in Linux

Another way to check the number of cpu cores in Linux is by using the lscpu command. This command gives you a lot of information about the cpu, including the number of cores. To run it, just type the following command into your terminal: lscpu

The lscpu command displays either one single CPU family or all families detected by querying sysfs (on Linux kernels with CONFIG_SYSFS). It supports Intel x86, AMD Family 16h/18h, and ARM processors.

The number of CPU cores = sockets * Core per socket
In the following examples, the number of CPU cores is 1 * 2=2

$ 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: 2
Core(s) per socket: 2
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 85

check CPU cores with dmidecode command in Linux

dmidecode command can be used to check the number of cpu cores in Linux. It is a command-line tool to retrieve device data that the Linux kernel exposes through MCU. To run it, just type the following command into your terminal:

$ dmidecode -t processor | grep “Core Count”

This command is very useful if you want to get more information about your hardware info, such as CPU or memory.
dmidecode –type processor
dmidecode –type memory

As you can see, there are three different ways to check the number of cpu cores in Linux. Each method has its own advantages and disadvantages, so be sure to choose the one that is best for you. If you want a simple way to check the number of cpu cores, then I recommend using the /proc/cpuinfo file. If you want more information about your system’s cpu, then I recommend using the lscpu command. Whichever method you choose, be sure to use it to optimize your system for performance. Thanks for reading!

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