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bug#44175: [optimization] Grafting is too slow
From: |
Ludovic Courtès |
Subject: |
bug#44175: [optimization] Grafting is too slow |
Date: |
Fri, 23 Oct 2020 23:17:49 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) |
Maxim Cournoyer <maxim.cournoyer@gmail.com> skribis:
> Lars-Dominik Braun <ldb@leibniz-psychology.org> writes:
>
>> Hi Maxim,
>>
>>> Judging from the above, it seems this issue has been resolved.
>> grafting is still a performance issue imo. Compare for example:
>>
>> $ time guix environment --ad-hoc --search-paths r-learnr
>> guix environment --ad-hoc --search-paths r-learnr 5,90s user 0,09s system
>> 210% cpu 2,844 total
>> $ time guix environment --ad-hoc --search-paths r-learnr --no-grafts
>> guix environment --ad-hoc --search-paths r-learnr --no-grafts 2,03s user
>> 0,08s system 164% cpu 1,277 total
>
> I'm opening a new issue to track optimizing the grafting code, since
> it's independent of environments (grafts are applied anytime a
> derivation is built, AFAICT). Grafting is inherently IO-bound,
What is slow above is not grafting itself: it’s determining what to
graft that takes CPU time.
I had reopened the initial bug at <https://issues.guix.gnu.org/41702>;
should we close this one?
Thanks,
Ludo’.
bug#41702: `guix environment` performance issues, Ludovic Courtès, 2020/10/23