On Wed, 16 Jun 2021 at 08:19, Florian Weimer <fweimer@xxxxxxxxxx> 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)
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
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.
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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