I'm trying to get AVX2 enabled on a machine with Ubuntu 20.04.
I've run these commands to install AVX2:
Update the package index: # sudo apt-get update Install libmkl-avx2 deb package: # sudo apt-get install libmkl-avx2 as per:
The processor is:
processor : 0 vendor_id : AuthenticAMD cpu family : 21 model : 2 model name : AMD FX-8320E Eight-Core Processor stepping : 0 microcode : 0x6000852 cpu MHz : 2036.567 cache size : 2048 KB physical id : 0 siblings : 8 core id : 0 cpu cores : 4 apicid : 16 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc> bugs : fxsave_leak sysret_ss_attrs null_seg spectre_v1 spectre_v2 spec_store_bypass bogomips : 6422.00 TLB size : 1536 4K pages clflush size : 64 cache_alignment : 64 address sizes : 48 bits physical, 48 bits virtual power management: ts ttp tm 100mhzsteps hwpstate cpb eff_freq_ro but when checking for avx in cpuinfo I only see avx, not avx2:
grep avx /proc/cpuinfo flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 popcnt aes xsave avx f16c lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt fma4 tce nodeid_msr tbm topoext perfctr_core perfctr_nb cpb hw_pstate ssbd ibpb vmmcall bmi1 arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold What am I doing wrong? Do I need to enable AVX2 somehow?
In case anybody's wondering if I'm asking how to install AVX2. I'm not. They're already installed. Just not available/recognized by the cpu for some reason. see below:
root@home:~$ sudo apt-get install libmkl-dev libmkl-avx2 Reading package lists... Done Building dependency tree Reading state information... Done libmkl-avx2 is already the newest version (2020.0.166-1). libmkl-dev is already the newest version (2020.0.166-1). 0 upgraded, 0 newly installed, 0 to remove and 141 not upgraded. 
