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Re: Performance improvements
From: |
Ludovic Courtès |
Subject: |
Re: Performance improvements |
Date: |
Mon, 28 Oct 2019 00:06:25 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) |
Hi!
Some more improvements come from these commits:
ac19950507 gnu: bootstrap: Cache the 'bootstrap-executable' origins.
5166d02730 gnu: bootstrap: 'bootstrap-origin' preserves eq?-ness when no
changes are made.
d727a9343d derivations: Don't memoize 'derivation->bytevector'.
f5fca9a82c gexp: Cache the module to derivation mappings.
c57e417eff store: Allow objects in the cache to be inserted and search for
with 'equal?'.
f58b45350b gexp: Add 'imported+compiled-modules'.
f726f6f802 derivations: 'build-expression->derivation' caches its module
derivations.
cf7648f882 derivations: Introduce 'imported+compiled-modules'.
This caches the module-to-derivation mapping, which wasn’t cached until
now.
Overall the goal is to have the high-level caches work nicely (the
“object cache” in particular), rendering the low-level caches (such as
the ‘add-data-to-store’ cache) potentially useless. This is beneficial
because a cache hit on the object cache saves more CPU time than a cache
hit on a low-level cache.
Ludovic Courtès <address@hidden> skribis:
> $ time guix build libreoffice -nd
> /gnu/store/8drmbhsrayr2j5lkvrwq37rg8g06hgsw-libreoffice-6.1.5.2.drv
>
> real 0m2.142s
> user 0m2.323s
> sys 0m0.082s
> $ guix describe
> Generacio 110 Oct 14 2019 08:43:33 (nuna)
> guix bd04fe8
> repository URL: https://git.savannah.gnu.org/git/guix.git
> branch: master
> commit: bd04fe878627a14533d908ccdf5b906050d6e0a4
And now:
--8<---------------cut here---------------start------------->8---
$ time /tmp/new/bin/guix build libreoffice -nd
/gnu/store/ibzap0v1c367h0j2mdd2jmlsfx9jplfb-libreoffice-6.1.5.2.drv
real 0m1.658s
user 0m1.699s
sys 0m0.073s
$ /tmp/new/bin/guix describe
Generacio 1 Oct 28 2019 00:03:05 (nuna)
guix 271b3c9
repository URL: https://git.savannah.gnu.org/git/guix.git
branch: master
commit: 271b3c9d16f8880f4a27b52a615cdec611322fae
--8<---------------cut here---------------end--------------->8---
Ludo’.