From: "Ludovic Courtès" <ludo@gnu.org>
To: Tobias Geerinckx-Rice <me@tobias.gr>
Cc: 51427@debbugs.gnu.org,
Liliana Marie Prikler <liliana.prikler@gmail.com>,
maxim.cournoyer@gmail.com, zimon.toutoune@gmail.com
Subject: [bug#51427] [PATCH] nix: libstore: Do not remove unused links when deleting specific items.
Date: Thu, 21 Jul 2022 11:21:18 +0200 [thread overview]
Message-ID: <877d46n7n5.fsf_-_@gnu.org> (raw)
In-Reply-To: <877d48lx41@nckx> (Tobias Geerinckx-Rice's message of "Tue, 19 Jul 2022 21:25:24 +0200")
Hi,
Tobias Geerinckx-Rice <me@tobias.gr> skribis:
> Liliana Marie Prikler 写道：
>> scheme@(guile-user)> ,t (length (scandir "/gnu/store/.links"))
>> $1 = 213027
>> ;; 1417.872747s real time, 28.514293s run time. 1.284866s spent in
>> GC.
>
> […]
>
>> So yeah, assuming that scandir scales linearly
>
> …your rotational drive is beyond ridiculously slower than mine (an
> ST1000DM010-2EP102):
>
> athena.tobias.gr:~ λ echo 3 | sudo tee /proc/sys/vm/drop_caches 3
> athena.tobias.gr:~ λ guix repl
> […]
> scheme@(guix-user)> ,use (ice-9 ftw)
> scheme@(guix-user)> ,t (length (scandir "/gnu/store/.links"))
> $1 = 164437
> ;; 7.081361s real time, 2.569773s run time. 0.199963s spent in GC.
It’s crazy that there are two orders of magnitude of difference between
these two hard disks.
Liliana, is your hard disk old or low-end?
I agree that we should strive to have good performance on that kind of
hardware too, but I don’t know how to get there.
Ludo’.
next prev parent reply other threads:[~2022-07-21 9:22 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-27 3:49 [bug#51427] [PATCH] nix: libstore: Do not remove unused links when deleting specific items Maxim Cournoyer
2021-10-28 14:16 ` Ludovic Courtès
2021-10-31 8:50 ` Liliana Marie Prikler
2021-10-31 14:07 ` Ludovic Courtès
2021-10-31 14:39 ` Liliana Marie Prikler
2021-10-31 20:51 ` Maxim Cournoyer
2021-11-03 10:45 ` zimoun
2021-11-06 16:57 ` Ludovic Courtès
2021-11-09 4:11 ` Maxim Cournoyer
2021-11-09 4:57 ` Jack Hill
2021-11-09 12:56 ` Ludovic Courtès
2021-11-09 18:10 ` zimoun
2021-11-17 10:02 ` Ludovic Courtès
2021-11-17 11:49 ` zimoun
2022-07-18 13:57 ` Ludovic Courtès
2022-07-18 17:03 ` Liliana Marie Prikler
2022-07-19 8:34 ` Ludovic Courtès
2022-07-19 18:42 ` Liliana Marie Prikler
2022-07-19 19:25 ` Tobias Geerinckx-Rice via Guix-patches via
2022-07-21 9:21 ` Ludovic Courtès [this message]
2022-07-21 18:02 ` Liliana Marie Prikler
2022-07-22 12:14 ` Ludovic Courtès
2022-07-22 13:39 ` Maxime Devos
2022-07-22 23:07 ` Ludovic Courtès
2022-07-23 6:52 ` Liliana Marie Prikler
2022-07-23 10:24 ` Maxime Devos
2023-06-12 20:55 ` Felix Lechner via Guix-patches via
2023-06-13 4:26 ` Liliana Marie Prikler
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