On Wed, 16 Jun 2021 at 08:19, Florian Weimer <fwei...@redhat.com> wrote:
> * Stephen John Smoogen: > > > I used this > > > https://unix.stackexchange.com/questions/631217/how-do-i-check-if-my-cpu-supports-x86-64-v2 > > to see what cpu instructions are at each level > > > > ``` > > #!/usr/bin/awk -f > > > > BEGIN { > > while (!/flags/) if (getline < "/proc/cpuinfo" != 1) exit 1 > > if (/lm/&&/cmov/&&/cx8/&&/fpu/&&/fxsr/&&/mmx/&&/syscall/&&/sse2/) > level = 1 > > if (level == 1 && > /cx16/&&/lahf/&&/popcnt/&&/sse4_1/&&/sse4_2/&&/ssse3/) level = 2 > > if (level == 2 && > /avx/&&/avx2/&&/bmi1/&&/bmi2/&&/f16c/&&/fma/&&/abm/&&/movbe/&&/xsave/) > level = 3 > > if (level == 3 && > /avx512f/&&/avx512bw/&&/avx512cd/&&/avx512dq/&&/avx512vl/) level = 4 > > if (level > 0) { print "CPU supports x86-64-v" level; exit level + 1 > } > > exit 1 > > } > > ``` > > Hmm. I believe the script is almost correct, not sure about “xsave” part. > The “fma” match is problematic because it also applies to “fma4”, which > is definitely not correct. > > I think changing that to /fma[[:space:]]/ would fix that.. > On Fedora 34 or later, you can use “/lib64/ld-linux-x86-64.so.2 --help”. > If x86-64-v2 shows up as “supported”, there is compatibile: > > | Subdirectories of glibc-hwcaps directories, in priority order: > | x86-64-v4 > | x86-64-v3 (supported, searched) > | x86-64-v2 (supported, searched) > > On older Fedora, you can run: > > podman run fedora:latest /lib64/ld-linux-x86-64.so.2 --help > > oh cool. this even works on CentOS and RHEL systems: ``` smooge@xanadu ~]$ podman run fedora:latest /lib64/ld-linux-x86-64.so.2 --help ... Subdirectories of glibc-hwcaps directories, in priority order: x86-64-v4 x86-64-v3 (supported, searched) x86-64-v2 (supported, searched) Legacy HWCAP subdirectories under library search path directories: haswell (AT_PLATFORM; supported, searched) tls (supported, searched) avx512_1 x86_64 (supported, searched) [smooge@xanadu ~]$ uname -a Linux xanadu.int.smoogespace.com 4.18.0-305.0.1.el8.x86_64 #1 SMP Fri May 28 11:04:28 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux ``` from my oldest system. > Thanks, > Florian > > -- Stephen J Smoogen. I've seen things you people wouldn't believe. Flame wars in sci.astro.orion. I have seen SPAM filters overload because of Godwin's Law. All those moments will be lost in time... like posts on BBS... time to reboot.
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