bug#63986: Julia is very slow

[Cayetano Santos via Bug reports for GNU Guix <bug-guix@gnu.org>]

>jeu. 14 sept. 2023 at 13:33, Efraim Flashner <efraim@flashner.co.il> wrote:

> [[PGP Signed Part:Undecided]]
> On Sun, Aug 20, 2023 at 10:53:44PM +0200, Ludovic Courtès wrote:
>> Hi!
>>
>> Friendly ping.  :-)
>>
>>   https://issues.guix.gnu.org/63986
>>
>> Ludo’.
>>
>> Ludovic Courtès <ludo@gnu.org> skribis:
>>
>> > Hi there!
>> >
>> > What’s the status?  Sounds like we have a couple of fixes already.
>> >
>> > Maybe you can submit one of them to guix-patches@gnu.org so qa.guix can
>> > pick it up.  And if one of them is more intrusive (more rebuilds), then
>> > submit it separately so it gets merged later?  How does that sound?
>> >
>> > Ludo’.
>
> I've attached a diff to adjust openblas64 and to use it for x86_64 in
> julia. I don't know if it's faster than the current openblas.

I have applied the patch in a freshly cloned guix repo, and build julia
within a shell as for the instructions under ’Contributing’.

I get the 13 ms when running the original test, so I guess the issue is
solved (other than thinking about the feasibility of performance tests
to avoid this kind of situations).

Thanks a lot !

C.