On 29 Jun 2024, at 03:18, Ryan Bach via users users@lists.fedoraproject.org wrote:

https://community.clearlinux.org/t/apx-and-avx10-compiled-binaries-coming-to...

Does Fedora 41 have x86-64-1-4 optimized rpms to select from?

There are two parts to this. The first is that all Fedora RPMs are compiled to x86-64-v1.

The second part is that there are programs packaged by Fedora that detect the micro-architecture and run optimised code paths depending on what is detected.

You can see what your micro-architecure support is with this command:

/usr/lib64/ld-linux-x86-64.so.2 --help

Which for my main desktop system reports at the end:

This program interpreter self-identifies as: /lib64/ld-linux-x86-64.so.2

Shared library search path: (libraries located via /etc/ld.so.cache) /lib64 (system search path) /usr/lib64 (system search path)

Subdirectories of glibc-hwcaps directories, in priority order: x86-64-v4 x86-64-v3 (supported, searched) x86-64-v2 (supported, searched)

You can see from this that there is support for searching for micro-architectures specific code.

Depending on the software that you care about this may or may not be doing this. For most packages compiling to x86-64-v4 make little or no performance difference.

At the moment there is no plan to rebase Fedora on x86-64-v2 let alone x86-64-v4.

Barry

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