How to tell if a Linux machine supports AVX/AVX2 instructions?

linux unix avx suse avx2
user4979733 picture user4979733 · May 27, 2016 · Viewed 50.2k times · Source

I'm on SUSE Linux Enterprise 10/11 machines. I launch my regressions to a farm of machines running Intel processors. Some of my tests fail because my tools are built using a library which requires AVX/AVX2 instruction support. I get an Illegal exception error.

In Linux, is there any commands I can use to determine what is the CPU code/family name?

I believe AVX and AVX2 are available onward from Intel SandyBridge and Haswell family, respectively.

Answer

khrm picture khrm · May 27, 2016

Run this command:

grep avx /proc/cpuinfo

Or 

grep avx2 /proc/cpuinfo

This will give you:

flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon rep_good nopl eagerfpu pni pclmulqdq vmx ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx avx2 hypervisor lahf_lm arat tsc_adjust xsaveopt

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