Re: Packages optimized for very specific x86_64 "x" generation (OpenSUSE OBS / Fedora Koji)

[Stephen John Smoogen]

On 13 April 2018 at 09:47, Germano Massullo  wrote:
> As darktable co-maintainer, today I was speaking with darix from
> OpenSUSE community, which maintains such package on that distro.
> On their OBS build system, they are able to build various packages each
> one optimized for a single x86_64 CPU generation using @BUILD_FLAVOR@ +
> _multibuild file.[1] So for example they have packages
> darktable-broadwell
> darktable-ivybridge
> darktable-sandybridge
> darktable-skylake
> darktable-skylake-avx512
>
>  darix also said "that is an OBS feature, nothing that you can just copy
> to koji[...]"
> "there is no generic solution to this for a normal distro package".
>
> I would like to study a way to make darktable (sub)packages very
> optimized for each CPU generation, so I am asking you if that is
> possible on Fedora, and what I should study to achieve it.
>

I would prefer if you also didn't do this with koji. This is more of a
feature for copr as you are exploding out the amount of storage that
the distribution uses by each of these architectures. [And if one
package wants cpu specialization, then many packages will want it even
if it doesn't make sense because the optimized cpu instruction speed
is completley lost in anything that asks for memory or disk.

> Best regards
>
> [1]:
> https://build.opensuse.org/package/show/home:darix:darktable:master/darktable
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-- 
Stephen J Smoogen.
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Re: Packages optimized for very specific x86_64 "x" generation (OpenSUSE OBS / Fedora Koji)

[Dominik 'Rathann' Mierzejewski]

On Friday, 13 April 2018 at 15:47, Germano Massullo wrote:
> As darktable co-maintainer, today I was speaking with darix from
> OpenSUSE community, which maintains such package on that distro.
> On their OBS build system, they are able to build various packages each
> one optimized for a single x86_64 CPU generation using @BUILD_FLAVOR@ +
> _multibuild file.[1] So for example they have packages
> darktable-broadwell
> darktable-ivybridge
> darktable-sandybridge
> darktable-skylake
> darktable-skylake-avx512
> 
>  darix also said "that is an OBS feature, nothing that you can just copy
> to koji[...]"
> "there is no generic solution to this for a normal distro package".
> 
> I would like to study a way to make darktable (sub)packages very
> optimized for each CPU generation, so I am asking you if that is
> possible on Fedora, and what I should study to achieve it.

On Fedora 27+ (glibc 2.26+), you can use the standard way of building
optimized libraries and putting them in platform and capability-specific
directories, e.g.:
/usr/lib64/haswell
/usr/lib64/haswell/avx512_1
/usr/lib64/xeon_phi

It's not the same as OBS does, but it's better than nothing.

See this article for more information
https://clearlinux.org/blogs/transparent-use-library-packages-optimized-intel-architecture

Regards,
Dominik
-- 
Fedora   https://getfedora.org  |  RPMFusion   http://rpmfusion.org
There should be a science of discontent. People need hard times and
oppression to develop psychic muscles.
-- from "Collected Sayings of Muad'Dib" by the Princess Irulan
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Packages optimized for very specific x86_64 "x" generation (OpenSUSE OBS / Fedora Koji)

[Germano Massullo]

As darktable co-maintainer, today I was speaking with darix from
OpenSUSE community, which maintains such package on that distro.
On their OBS build system, they are able to build various packages each
one optimized for a single x86_64 CPU generation using @BUILD_FLAVOR@ +
_multibuild file.[1] So for example they have packages
darktable-broadwell
darktable-ivybridge
darktable-sandybridge
darktable-skylake
darktable-skylake-avx512

 darix also said "that is an OBS feature, nothing that you can just copy
to koji[...]"
"there is no generic solution to this for a normal distro package".

I would like to study a way to make darktable (sub)packages very
optimized for each CPU generation, so I am asking you if that is
possible on Fedora, and what I should study to achieve it.

Best regards

[1]:
https://build.opensuse.org/package/show/home:darix:darktable:master/darktable
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