Re: F42 Change Proposal: Optimized Binaries for the AMD64 / x86_64 Architecture (v2) (self-contained)

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On Mon, Jan 13, 2025 at 09:11:35AM +0000, Zbigniew Jędrzejewski-Szmek wrote:
> First, this would require setting up the infrastructure to build and
> store and distribute multiple builds of a single version of a
> package. This is something that Fedora currently doesn't do, so it'd
> require changes to operations in mock, koji, bodhi, the CI, mirrors.

We've been building packages like that for years, so I don't understand
how it would require changes.  E.g. we had glibc.i386 and glibc.i686, when
glibc was built, it was built for both of those architectures and rpm/yum
chose the right one.

> Second, dnf would need to learn about this and install the appropriate
> variant.

I think it should have that support like it had for i686 vs. i386.

> Third, this choice would be "permanent", i.e. it would be done once at
> package installation time. If the user tries to boot the same image
> on different hardware, it might fail. This is inferior to the proposed
> approach where the choice is made at runtime.

It is superior to that, because you don't have to pay the cost every time
you run the program.

	Jakub

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