Re: 02/03: gnu: openblas: Update architectures we provide substitutes for.

[Christopher Baines]

Efraim Flashner <efraim@flashner.co.il> writes:

> On Fri, Jun 02, 2023 at 11:03:42PM +0100, Christopher Baines wrote:
>> 
>> guix-commits@gnu.org writes:
>> 
>> > efraim pushed a commit to branch master
>> > in repository guix.
>> >
>> > commit 076688fa1e41a09f034a80e1a593bac43f1f1482
>> > Author: Efraim Flashner <efraim@flashner.co.il>
>> > AuthorDate: Thu Jun 1 11:06:00 2023 +0300
>> >
>> >     gnu: openblas: Update architectures we provide substitutes for.
>> >
>> >     * gnu/packages/maths.scm (openblas)[arguments]: Adjust the 
>> > substitutable?
>> >     flag to only not provide substitutes when building for powerpc-linux.
>> >     Adjust the comment accordingly.
>> > ---
>> >  gnu/packages/maths.scm | 11 ++---------
>> >  1 file changed, 2 insertions(+), 9 deletions(-)
>> 
>> I've been looking at why armhf-linux substitute availability has been
>> dropping recently, and I think this change triggered a lot of
>> rebuilds. Could this have gone to core-updates?
>> 
>> → guix refresh -l openblas
>> Building the following 2282 packages would ensure 5596 dependent packages 
>> are rebuilt: ...
>
> It's not that it's triggered rebuilds, but that it's triggered builds.
> It's also triggered builds on powerpc64le and riscv64. Before any
> package which had openblas as a transitive dependency wasn't built by
> the CI because it wasn't substitutable¹. People still have the option of
> using package transformations to use openblas tuned for the cortex a7 or
> a15 on armhf, but in reality this just unlocks substitutes for those
> ~5600 packages which wasn't available before.
>
> ¹ We saw this in the past briefly in the past when openzfs made its way
> as a dependency to qemu and through that to Gnome.

Ok, so the documentation does mention "rebuilding", and I do see that
indeed ci.guix.gnu.org doesn't build not substitutable things.

Although I think it doesn't apply recursively. Take qjson, guix refresh
-l tells me it's dependent on openblas, and looking back at say this
output [1] for powerpc64le-linux, that's available from both
ci.guix.gnu.org. Which makes sense, as that derivation is substitutable,
even though one of it's inputs isn't.

1: 
https://data.guix.gnu.org/gnu/store/fibiwzyz8s899ccpix5zs6r2pcdpxk5b-qjson-0.9.0

Maybe on the client side this works differently, and guix won't
substitute things which have a non substitutable input?

Assuming ci.guix.gnu.org was building things for armhf-linux, I think
this would have still caused ~5596 rebuilds, and as I say, I think for
systems like powerpc64le-linux, I think it did cause ~5596
rebuilds.

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