From: zimoun <zimon.toutoune@gmail.com>
To: "Ludovic Courtès" <ludo@gnu.org>,
"Maxime Devos" <maximedevos@telenet.be>
Cc: 58035@debbugs.gnu.org
Subject: [bug#58035] sync-before-registering is false, possibly the cause of empty files in the store
Date: Mon, 17 Oct 2022 20:03:28 +0200 [thread overview]
Message-ID: <878rlel43z.fsf@gmail.com> (raw)
In-Reply-To: <87zgebs1h5.fsf@gnu.org>
Hi,
3x time slower with my hardware. Closing?
On mar., 04 oct. 2022 at 23:49, Ludovic Courtès <ludo@gnu.org> wrote:
> Maybe a good test would be to run a daemon on an “average” HDD with
> sync-before-registering = true and to run ‘perf timechart record’ while
> it’s fetching a large number of substitutes. That way we’d have
> concrete data to talk about.
+ Comparison using the manifest below.
+ guix-daemon built using fd4cbcbed7; two flavors.
+ Guix revision f43a783.
+ Before the experiment, complete ’guix gc’.
# test-58035/guix-daemon --build-users-group=guixbuild
# perf timechart record
$ time guix build -m some-packages.scm
# perf timechart --highlight guix
1/ sync-before-registering = false
real 6m24.215s
user 0m10.627s
sys 0m0.512s
[ perf record: Woken up 1984 times to write data ]
[ perf record: Captured and wrote 497.403 MB perf.data (5042727 samples)]
2/ sync-before-registering = true
real 19m46.470s
user 0m12.367s
sys 0m0.557s
[ perf record: Woken up 2625 times to write data ]
[ perf record: Captured and wrote 658.066 MB perf.data (6712342 samples) ]
Well, the charts are really big.
$ du -sh {1,2}-build-*.svg
331M 1-build-false.svg
599M 2-build-true.svg
Therefore, please find them using this link (alive for 15 days):
https://filesender.renater.fr/?s=download&token=0e861286-ec0c-4815-bb49-2bce91b14462
Cheers,
simon
--8<---------------cut here---------------start------------->8---
(use-modules (guix build-system haskell)
(guix build-system julia)
(guix packages)
(guix profiles)
(gnu packages))
(manifest
(map package->manifest-entry
(fold-packages
(lambda (package result)
(if (or
;;(eq? (package-build-system package) haskell-build-system)
(eq? (package-build-system package) julia-build-system))
(cons package result)
result))
'())))
--8<---------------cut here---------------end--------------->8---
--8<---------------cut here---------------start------------->8---
diff --git a/nix/libstore/globals.cc b/nix/libstore/globals.cc
index d4f9a46a74..5f8a3a3031 100644
--- a/nix/libstore/globals.cc
+++ b/nix/libstore/globals.cc
@@ -40,7 +40,7 @@ Settings::Settings()
reservedSize = 8 * 1024 * 1024;
fsyncMetadata = true;
useSQLiteWAL = true;
- syncBeforeRegistering = false;
+ syncBeforeRegistering = true;
useSubstitutes = true;
useChroot = false;
impersonateLinux26 = false;
--8<---------------cut here---------------end--------------->8---
next prev parent reply other threads:[~2022-10-17 18:04 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-24 1:35 [bug#58035] sync-before-registering is false, possibly the cause of empty files in the store Maxime Devos
2022-10-04 7:52 ` Ludovic Courtès
2022-10-04 14:04 ` Maxime Devos
2022-10-04 21:49 ` Ludovic Courtès
2022-10-05 7:58 ` Maxime Devos
2022-10-05 11:54 ` zimoun
2022-10-07 9:44 ` Ludovic Courtès
2022-10-17 18:03 ` zimoun [this message]
2022-10-17 18:51 ` Maxime Devos
2022-10-18 15:34 ` Ludovic Courtès
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