[bug#36630] [PATCH] guix: parallelize building the manual-database

[Arne Babenhauserheide <arne_bab@web.de>]

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Ludovic Courtès <ludo@gnu.org> writes:

> Arne Babenhauserheide <arne_bab@web.de> skribis:
>
>> Ludovic Courtès <ludo@gnu.org> writes:
>>
>>> Did you try the ‘guix environment -n’ command above?  Doesn’t it show
>>> the manual-database.drv?
>>
>> It does show the manual database, but then running guix build
>> /gnu/....drv --check does not run my changed code.
>>
>> I’m doing
>>
>> time ./pre-inst-env guix build /gnu/store/jnkxwwxk71n07fs6naa11fxmg3vpnnb3-manual-database.drv --check
>>
>> But it runs the installed guix, not the local changes to profile.scm.
>
> Right, sorry for being unclear: you need to run
>
>   ./pre-inst-env guix environment -n …
>
> That will run you modified code and thus create a manual-database.drv
> that uses your code; it’s this manual-database.drv that you should pass
> to ‘guix build’.

That works now — thank you!

With the change:
185552 entries processed in 108.2 s
Before the change:
185552 entries processed in 220.1 s

The exact commands I’m running:
cd Dokumente/Guix/guix
git checkout master # with the change
./pre-inst-env guix environment --ad-hoc jupyter python-ipython python-ipykernel -n
time guix build /gnu/...-manual-database.drv
git checkout 97bf46e64c11c64a968fdb833983ede6bdafbc00
./pre-inst-env guix environment --ad-hoc jupyter python-ipython python-ipykernel -n
time guix build /gnu/...-manual-database.drv

So I also see roughly factor 2 speedup, which means a limit to 4 threads
should work.

(what I saw is that I only see the …manual-database.drv before I build
it, after it’s built, I no longer see it in the environment output)

How do I get the defined limit of cores and threads?

Best wishes,
Arne
-- 
Unpolitisch sein
heißt politisch sein
ohne es zu merken

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