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From: "Ludovic Courtès" <ludo@gnu.org>
To: Luis Felipe <luis.felipe.la@protonmail.com>
Cc: 44053@debbugs.gnu.org, jbranso@dismail.de
Subject: bug#44053: Poor profile generation performance on spinning disks
Date: Sat, 09 Sep 2023 13:02:11 +0200	[thread overview]
Message-ID: <87zg1vy5ho.fsf@gnu.org> (raw)
In-Reply-To: <mSj2EYYJvpknifEjHBEvx96jRolchzWAitRR1aPwzJ_5vubGRYl9TIPoBxZrcf0tmN-bcXiXfkpXTL-vNy-S2ekb9K4_D6somthxsXamoYQ=@protonmail.com> (Luis Felipe's message of "Tue, 29 Aug 2023 21:51:29 +0000")

Hi Luis,

Luis Felipe <luis.felipe.la@protonmail.com> skribis:

>> Could you time just profile generation itself?
>> 
>
>> To do that, you need to find the profile generation and then to rebuild
>> it, along these lines:
>> 
>
>> DRV=$(guix gc --derivers $(readlink -f ~/.guix-profile))
>> time guix build --check $DRV
>
> The above results in
>
>   real	1m28,841s
>   user	0m2,169s
>   sys	0m0,450s

Thanks.

It means that profile generation itself (and not just hooks) is slow.

The place to look at is (guix build union).  Unfortunately, I suspect
there’s little room for optimization at this stage (see commit
12129998689648923b58c426362a1bc875da75f9 from… 2014).

Fundamentally, ‘union-build’ traverses every input directory, which is
expensive with low-end hard disks.  It would still be worth
investigating (for example by strace’ing the ‘union-build’ process) in
case we missed optimizationm opportunities, though.

Thanks,
Ludo’.




      reply	other threads:[~2023-09-09 11:03 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-18  3:35 bug#44053: Poor profile generation performance on spinning disks Maxim Cournoyer
2020-10-18 23:05 ` Luis Felipe via Bug reports for GNU Guix
2020-10-19  8:18 ` zimoun
2020-10-19 18:18   ` Maxim Cournoyer
2022-03-23 12:38 ` zimoun
2022-03-23 16:17   ` Maxim Cournoyer
2022-03-23 16:54     ` zimoun
2023-08-26 22:11 ` jbranso--- via Bug reports for GNU Guix
2023-08-27 17:59   ` Luis Felipe via Bug reports for GNU Guix
2023-08-29  9:19     ` Ludovic Courtès
2023-08-29 21:51       ` Luis Felipe via Bug reports for GNU Guix
2023-09-09 11:02         ` Ludovic Courtès [this message]

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