CPU_COUNT - Linux
Overview
CPU_COUNT is a Linux command that provides information about the number of logical CPUs (cores) and their topology. It’s primarily used to optimize software and scripts that need to manage or utilize multiple cores effectively.
Syntax
CPU_COUNT [options]
Options/Flags
- -l, –logical: Display logical cores count. (Default)
- -p, –physical: Display physical cores count.
- -t, –threads: Display hardware threads (hyperthreads).
- -q, –quiet: Suppress output, return 0 for 1 core, 1 for 2+ cores.
- -v, –verbose: Display detailed CPU topology information.
- -h, –help: Display help and usage information.
- -V, –version: Display program version number.
Examples
Example 1: Display Logical Cores Count
CPU_COUNT
Output: 4
Example 2: Display Physical Cores Count
CPU_COUNT -p
Output: 2
Example 3: Detailed CPU Topology Information
CPU_COUNT -v
Output:
Logical CPUs: 4
Physical CPUs: 2
Hardware Threads: 2
CPU Topology:
core NUMA node id cores siblings
0 0 [0,1] [0,1,2,3]
1 0 [0,1] [0,1,2,3]
Common Issues
- No output: Ensure the command is executed with root privileges or using
sudo. - Inaccurate results: Some virtualized environments may report incorrect core counts. Use
-voption to verify the results.
Integration
- Load Balancing: Use CPU_COUNT to distribute workload across available cores.
- Benchmarking: Determine the hardware capabilities of a system for performance optimization.
- System Optimization: Manage tasks and processes to avoid overloading or idle cores.
Related Commands
lscpunproctaskset