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Table of Contents
Basic Usage: Run lscpu Without Arguments
Use lscpu to Get More Specific Details
Understand What the Output Really Means
Home System Tutorial LINUX How to get detailed information about the CPU with lscpu?

How to get detailed information about the CPU with lscpu?

Jul 14, 2025 am 01:45 AM

To get CPU details with lscpu, run the command in the terminal. It displays architecture, CPU(s), core count, threads, cache, and more. Useful fields include Architecture, CPU(s), Thread(s) per core, Core(s) per socket, and Model name. For specific info, use flags like --list, --extended, or --json to customize output. Understanding terms like socket, core, thread, and NUMA node helps interpret performance-related data.

How to get detailed information about the CPU with lscpu?

If you want to get detailed information about your CPU using lscpu, it's actually pretty straightforward. This command-line tool gives you a clear and concise breakdown of your CPU architecture, cores, threads, cache, and more — no need for complicated commands or external tools.

Basic Usage: Run lscpu Without Arguments

Just open your terminal and type:

lscpu

That’s all. It will display key CPU details like architecture, number of CPUs, core count, thread per core, cache sizes, and more. The output is easy to read and well-organized. Here are some of the most useful fields it shows by default:

  • Architecture: Whether it's x86_64, ARM, etc.
  • CPU(s): Total number of online CPUs.
  • Thread(s) per core: Tells you if hyperthreading/simultaneous multithreading (SMT) is enabled.
  • Core(s) per socket: How many physical cores per CPU socket.
  • Model name: Full name of the CPU, including brand and model.

This basic view covers what most users need to know in day-to-day usage.

Use lscpu to Get More Specific Details

If you want even more granular control over what gets displayed, you can use flags to filter or format the output.

For example:

  • To list only specific fields:

    lscpu --list=CPU,CORE,THREAD,SMT

    This shows a compact table with info on which thread belongs to which core and whether SMT is on.

  • To see CPU features:

    lscpu --extended

    This gives a longer list that includes instruction sets (like SSE4.2, AVX, AES), virtualization support, and other capabilities.

  • To export data in a parseable format:

    lscpu --output=ARCH,CPUS,THREADS --json

    This outputs selected fields in JSON format, handy for scripting or automation.

    These options let you tailor the output to exactly what you're looking for without sifting through extra data.

    Understand What the Output Really Means

    Some terms might be confusing if you’re new to system architecture, so here's a quick breakdown:

    • Socket: A physical CPU slot on the motherboard. You may have one or more sockets.
    • Core: Each physical processing unit inside a CPU. Modern CPUs have multiple cores.
    • Thread: Logical processors within a core — usually two per core when SMT/hyperthreading is enabled.
    • NUMA node: Refers to memory access architecture; important in performance tuning on servers.

    Knowing how these relate helps you understand system performance, especially when allocating resources in containers, VMs, or high-performance computing tasks.


    That’s basically it. lscpu is simple but powerful — you don’t need to dig deep to get useful insights into your CPU setup.

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