On Thu, Mar 21, 2024 at 6:07 PM Samuel Sieb <sam...@sieb.net> wrote: > > On 3/21/24 14:45, Stephen Morris wrote: > > On 22/3/24 00:18, Barry wrote: > >>> On 20 Mar 2024, at 22:19, Stephen Morris <samor...@netspace.net.au> > >>> wrote: > >>> > >>> Just a couple of silly questions: > >>> AVX cpu's, both Intel and AMD, have been around since 2008, and > >>> this is 2024, why does Fedora not have support for the AVXx > >>> instruction sets? > >> Not all recent CPUs have AVX, only some CPUs I believe. > >> Therefore the preference for detect at runtime. > > I can understand the runtime detection, but why is pygame, presumably > > with its support for vectors, not compiled to use AVX if available. The > > math module doesn't produce the message, even though AVX can be used > > with integer manipulations, does that mean it has been compiled with AVX > > support or is it not checking for support? > > With, in this case, the pygame module having been installed from the > > Fedora repositories and producing this issue, does that mean I shouldn't > > install the modules from the Fedora repositories, I should use pip3 to > > install the modules as they may be compiled with AVX support? > > The message I got indicated that my cpu supports AVX2, how do I > > determine if it supports AVX512? > > The message is about AVX2, not AVX. The computer I'm currently using is > an Intel Xeon from 2019 or maybe a bit earlier. It has AVX, but not any > of the higher ones.
It is common to see manufacturers of low-end tablets and pc's buying cpu's from Intel that only have SSE2-SSE4.1+AES+RDRAND enabled. I encounter them regularly in low-end netbooks. The cpu's probably have higher ISAs, they just are not enabled. Intel will also de-clock or slow down the cpu for the price point. I was talking to David Johnson, who designed Intel's RDRAND circuit. He told me intel can tune about 100 different parameters to vary cpu features and speeds for a particular price point. > You can look in /proc/cpuinfo to see the flags, or install "cpuid" to > get very detailed information. Jeff -- _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
