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Re: Pre-built binaries vs. performance

From: Ludovic Courtès
Subject: Re: Pre-built binaries vs. performance
Date: Thu, 01 Feb 2018 18:48:38 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)

Fis Trivial <address@hidden> skribis:

> So, we can build packages in a generic way, and then provide optional
> dependencies.
> In this case, we treat SSE as default dependency and AVX2 as an optional
> dependency, let users specify whether they want it or not.
> AVX2 need not to be actual packages, it's just an abstraction.
> It's just a thought that we can abstract architecture as part of the
> dependency graph.

We do that in the form of the “system type”—“x86_64-linux”, etc.  That
captures what’s otherwise not captured in the graph: the architecture
and the kernel.

Someone proposed having, say, “x86_64avx2-linux”, which is similar in
spirit to what you’re proposing, I think.  However that’d be
inconvenient because every single package in the graph would have to be
rebuilt compared to “x86_64-linux”.

Also, I don’t see how to make that an _optional_ dependency.


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