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Re: Pre-built binaries vs. performance

From: Ludovic Courtès
Subject: Re: Pre-built binaries vs. performance
Date: Mon, 05 Feb 2018 10:22:29 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)


Fis Trivial <address@hidden> skribis:

>>> Instructions support seems like just another kind of runtime dependency,
>>> can we reconsider this:
>> What do you mean?  The thread you’re referring to doesn’t discuss
>> architecture-specific optimizations.
>> Ludo’.
> It's not architecture specific. But we can treat architecture as one of
> the runtime dependency, right? For example, openBlas depends on SSE
> instructions set, but, optionally it can depends on AVX2. (Not a perfect
> example since openblas can optimize itself at runtime, but hopefully you
> can understand the idea)
> 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.

Yeah, I see what you mean.  It would be nice, but it seems quite far
stretched from the current design; I wouldn’t know how to do that.


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