‘guix system vm-image’ spends a very long time “registering_ closures”

DoneSubmitted by Ludovic Courtès.
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  • Ludovic Courtès
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Ludovic Courtès wrote on 31 Aug 2018 12:07
‘guix system vm-image’ spends a very long time “registering closures”
(address . bug-guix@gnu.org)(name . Leo Famulari)(address . leo@famulari.name)
87wos6q27c.fsf@gnu.org
Hi,
A couple of days ago, Leo reported that ‘guix system vm-image’ spends avery long time in the “registering closures” phase:
Toggle snippet (35 lines)<lfam> I wonder about the slowness of 'registering closures' with `guix system vm-image` and similiar commands. I don't remember this taking so long in the past [22:52]
[...]
<lfam> Created a bare-bones VM takes ~90 minutes for me recently<lfam> s/Created/Creating<civodul> with vm-image?<lfam> Yes
[...]
<lfam> With #:reset-timestamps #f, I cancelled the task after 10 minutes of 'registering closures' [23:33]
[...]
<civodul> lfam: i added some pk's and it seems that it's deduplucation that's killing us [00:41]<civodul> because it involves retraversing each store item and reading each file [00:42]<lfam> It does it for each file?<lfam> Or, you could just point me to the relevant code so I can learn it :)<civodul> yeah, it has to read them to be able to determine if there are duplicates<civodul> (guix store database) calls the deduplication code [00:43]<civodul> which is in (guix store deduplication)<civodul> (reepca's code from last year's GSoC)<civodul> maybe c45477d2a1a651485feede20fe0f3d15aec48b39 or something close inadvertently turned on deduplication [00:44]<civodul> so in (gnu system vm), we could pass #:deduplicate? #f to 'root-partition-initializer'
Ludo’.
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Ludovic Courtès wrote on 2 Sep 2018 15:49
control message for bug #32600
(address . control@debbugs.gnu.org)
878t4kau1t.fsf@gnu.org
severity 32600 important
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Ludovic Courtès wrote on 23 Sep 2018 23:38
Re: bug#32600: ‘guix system vm-imag e’ spends a very long time “registe ring closures”
(address . 32600-done@debbugs.gnu.org)(name . Leo Famulari)(address . leo@famulari.name)
87mus7rj2c.fsf@gnu.org
Hello,
ludo@gnu.org (Ludovic Courtès) skribis:
Toggle quote (5 lines)> A couple of days ago, Leo reported that ‘guix system vm-image’ spends a> very long time in the “registering closures” phase:
> <lfam> Created a bare-bones VM takes ~90 minutes for me recently
As of commit fce225471128c4a5246342b3aa1b7e53a8066211, ‘guix systemvm-image bare-bones.tmpl’ runs in ~2m42s on my SSD-based laptop. Thekey commits here are fce225471128c4a5246342b3aa1b7e53a8066211 andbb3b6ccb05550fbfbeb459c68819a752327d6e1e.
Regarding deduplication (commitb5460d95e970608bee7a794590be1b051b57d3a3), I found that it doesn’tchange the image size of bare-bones.tmpl (1.2G), but enabling it makesthings slower, ~6m.
Lemme know how it goes for you!
Thanks,Ludo’.
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