CPU_ISSET - Linux

Overview

CPU_ISSET is a Linux command that checks if a specific CPU feature is supported by the current CPU. It is a convenient tool for optimizing code by tailoring it to the capabilities of the target system.

Syntax

CPU_ISSET feature

Parameters

  • feature: The CPU feature to check, such as sse3, avx2, or vmx.

Options/Flags

None.

Examples

Checking for SSE2 support

CPU_ISSET sse2

Contingency code based on CPU features

if CPU_ISSET avx512; then
  # Use AVX-512 optimized code
else
  # Use a fallback implementation
fi

Common Issues

  • Typographical errors: Ensure the feature name is spelled correctly.

Integration

CPU_ISSET can be used in conjunction with other commands to enhance functionality:

  • With grep to search for features in a file: grep CPU_ISSET output.txt
  • With xargs to check multiple features: echo sse2 avx2 | xargs -n1 CPU_ISSET

Related Commands

  • cat /proc/cpuinfo: Display detailed CPU information.
  • lscpu: Provide detailed information about the CPU architecture.