How To Check If Your Linux System Supports AVX and AVX2

This concise guide demonstrates how to verify AVX and AVX2 support on your Linux system via the command line. Knowing if your CPU supports these instruction sets is crucial for software or workloads that leverage data parallelism and vector processing. This is especially important for running Large Language Models (LLMs).

Table of Contents

• What are AVX and AVX2?
• Verifying AVX/AVX2 Support on Linux
  • Examining CPU Information
  • Utilizing the lscpu Utility
  • Checking CPU Specifications

What are AVX and AVX2?

AVX (Advanced Vector Extensions) and its successor, AVX2, are instruction set extensions for x86 processors from Intel and AMD. They enable efficient vector operations on large datasets, significantly boosting performance for applications utilizing Single Instruction, Multiple Data (SIMD) capabilities. AVX introduces 256-bit wide vector registers (AVX2 expands on this), allowing parallel processing of multiple data elements simultaneously. This is beneficial for tasks like multimedia processing, scientific computing, and machine learning. AVX is an evolution of earlier 128-bit vector extensions like SSE. Intel introduced AVX with Sandy Bridge (2011), and AVX2 with Haswell (2013); AMD adopted similar technologies around the same time.

Verifying AVX/AVX2 Support on Linux

Several methods exist to check for AVX/AVX2 support:

Examining CPU Information

Inspect the /proc/cpuinfo file using grep:

grep -o 'avx[^ ]*' /proc/cpuinfo

This command will output avx and/or avx2 (repeated for each core) if supported. Alternatively:

cat /proc/cpuinfo | grep -i 'avx'

or

grep --color=always -i 'avx' /proc/cpuinfo

(The --color=always option highlights matches).

Utilizing the lscpu Utility

The lscpu command provides comprehensive CPU details. Use:

lscpu | grep avx

Check the "Flags" section for avx and avx2.

Sample Output:

<code>Flags:                              fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l2 invpcid_single cdp_l2 ssbd ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid rdt_a avx512f avx512dq rdseed adx smap avx512ifma clflushopt clwb intel_pt avx512cd sha_ni avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves split_lock_detect dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp hwp_pkg_req avx512vbmi umip pku ospke avx512_vbmi2 gfni vaes vpclmulqdq avx512_vnni avx512_bitalg avx512_vpopcntdq rdpid movdiri movdir64b fsrm avx512_vp2intersect md_clear flush_l1d arch_capabilities</code>

Checking CPU Specifications

Consult your CPU's online specifications. Most modern Intel (Sandy Bridge and later) and AMD (Bulldozer and later) CPUs support AVX, with AVX2 support becoming prevalent in later generations. Note that older CPUs or low-power devices might lack AVX2 support, which can be a requirement for efficient LLM execution. For Intel processors, refer to: https://www.php.cn/link/8f57f8197501fe0c3d8913e717632812 (or a similar page for your specific Intel processor family).

This information should help you determine if your system is ready to handle AVX and AVX2-dependent tasks.

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