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Subject: [bug#58035] sync-before-registering is false, possibly the cause of empty files in the store
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Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Maxime Devos <maximedevos@HIDDEN> Subject: bug#58035: Acknowledgement (sync-before-registering is false, possibly the cause of empty files in the store) Message-ID: <handler.58035.B.166398331523230.ack <at> debbugs.gnu.org> References: <0530a80e-0a93-5a3a-ef98-5ba3683e810d@HIDDEN> X-Gnu-PR-Message: ack 58035 X-Gnu-PR-Package: guix-patches Reply-To: 58035 <at> debbugs.gnu.org Date: Sat, 24 Sep 2022 01:36:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): guix-patches@HIDDEN If you wish to submit further information on this problem, please send it to 58035 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 58035: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D58035 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: [bug#58035] sync-before-registering is false, possibly the cause of empty files in the store
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Hi,
Maxime Devos <maximedevos@HIDDEN> skribis:
> libstore/local-store.cc has the following comment:
>
> void LocalStore::registerValidPaths(const ValidPathInfos & infos)
> {
> /* SQLite will fsync by default, but the new valid paths may not
> be fsync-ed.
> * So some may want to fsync them before registering the validity,
> at the
> * expense of some speed of the path registering operation. */
> if (settings.syncBeforeRegistering) sync();
>
> [...]
> }
>
> However, currently sync-before-registering is set to 'false' AFAICT.
> I think this might be the cause of bugs like
> <https://issues.guix.gnu.org/58013> (=E2=80=98Can't use "guix pull"=E2=80=
=99), and
> maybe <https://issues.guix.gnu.org/57838> (=E2=80=98failing to boot, prob=
ably
> due to guix gc=E2=80=99).
It might be a factor, combined with the fact that the file system was
not properly unmounted (power outage or similar).
However, calling sync(2) for each store item is going to be expensive.
Recursive fsync/fdatasync calls are also likely to be too expensive (see
<https://issues.guix.gnu.org/55707> for a concrete example of the cost
on a spinning disk).
Thoughts?
Ludo=E2=80=99.
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Subject: [bug#58035] sync-before-registering is false, possibly the cause of empty files in the store
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From: Maxime Devos <maximedevos@HIDDEN>
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Cc: 58035 <at> debbugs.gnu.org
Message-ID: <6bd60f0b-ffac-dcc8-5225-df4b765522c5@HIDDEN>
Subject: Re: bug#58035: sync-before-registering is false, possibly the cause
of empty files in the store
References: <0530a80e-0a93-5a3a-ef98-5ba3683e810d@HIDDEN>
<874jwkvxdt.fsf@HIDDEN>
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X-Loop: help-debbugs@HIDDEN
Subject: [bug#58035] sync-before-registering is false, possibly the cause of empty files in the store
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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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Hi,
Maxime Devos <maximedevos@HIDDEN> skribis:
> On 04-10-2022 09:52, Ludovic Court=C3=A8s wrote:
>> Hi,
>> [...]
>>> However, currently sync-before-registering is set to 'false' AFAICT.
>>> I think this might be the cause of bugs like
>>> <https://issues.guix.gnu.org/58013> (=E2=80=98Can't use "guix pull"=E2=
=80=99), and
>>> maybe <https://issues.guix.gnu.org/57838> (=E2=80=98failing to boot, pr=
obably
>>> due to guix gc=E2=80=99).
>> It might be a factor, combined with the fact that the file system
>> was
>> not properly unmounted (power outage or similar).
>> However, calling sync(2) for each store item is going to be
>> expensive.
>> Recursive fsync/fdatasync calls are also likely to be too expensive (see
>> <https://issues.guix.gnu.org/55707> for a concrete example of the cost
>> on a spinning disk).
>> Thoughts?
>
> Debian uses fsync (going by https://wiki.debian.org/Teams/Dpkg/FAQ),
> and even though that according to that FAQ dpkg can be slow, in my
> experience it wasn't too bad. Also, having to investigate store
> corruption and how to fix it is a form of slowness, especially when it
> fails or you don't have the technical expertise and consequentially
> you need to reinstall (losing old non-back-upped work).
Having not experience corruption issues as in the bug you mention, I=E2=80=
=99m
tempted to minimize the problem, but it=E2=80=99s true that we get such rep=
orts
from time to time.
> 'sync' seems relatively inexpensive to me, compared to the time
> required for building a package and even more inexpensive compared to
> the cost of debugging store corruption:
That=E2=80=99s not a fair comparison. :-) Imagine, you run reconfigure/upg=
rade;
that downloads tens to hundreds of store items. Calling sync(2) after
each item may be hardly noticeably on an SSD, but I bet it=E2=80=99s going =
to be
super expensive on an HDD. (In the syslogd case, each fsync(2) call=E2=80=
=94not
even sync(2)=E2=80=94would cause pauses of several 100s of ms.)
Maybe a good test would be to run a daemon on an =E2=80=9Caverage=E2=80=9D =
HDD with
sync-before-registering =3D true and to run =E2=80=98perf timechart record=
=E2=80=99 while
it=E2=80=99s fetching a large number of substitutes. That way we=E2=80=99d=
have
concrete data to talk about.
Any takers? :-)
Ludo=E2=80=99.
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Subject: Re: bug#58035: sync-before-registering is false, possibly the cause
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From: zimoun <zimon.toutoune@HIDDEN>
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Hi,
On Tue, 04 Oct 2022 at 23:49, Ludovic Court=C3=A8s <ludo@HIDDEN> wrote:
> Maybe a good test would be to run a daemon on an =E2=80=9Caverage=E2=80=
=9D HDD with
> sync-before-registering =3D true and to run =E2=80=98perf timechart recor=
d=E2=80=99 while
> it=E2=80=99s fetching a large number of substitutes. That way we=E2=80=
=99d have
> concrete data to talk about.
What is =E2=80=99perf timechart record=E2=80=99? I can take a look if no o=
ne beats me.
Cheers,
simon
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zimoun <zimon.toutoune@HIDDEN> skribis:
> On Tue, 04 Oct 2022 at 23:49, Ludovic Court=C3=A8s <ludo@HIDDEN> wrote:
>
>> Maybe a good test would be to run a daemon on an =E2=80=9Caverage=E2=80=
=9D HDD with
>> sync-before-registering =3D true and to run =E2=80=98perf timechart reco=
rd=E2=80=99 while
>> it=E2=80=99s fetching a large number of substitutes. That way we=E2=80=
=99d have
>> concrete data to talk about.
>
> What is =E2=80=99perf timechart record=E2=80=99?
It=E2=80=99s a tool of Linux=E2=80=99s =E2=80=98perf=E2=80=99=E2=80=94see =
=E2=80=98guix install perf=E2=80=99.
HTH!
Ludo=E2=80=99.
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Hi,
3x time slower with my hardware. Closing?
On mar., 04 oct. 2022 at 23:49, Ludovic Court=C3=A8s <ludo@HIDDEN> wrote:
> Maybe a good test would be to run a daemon on an =E2=80=9Caverage=E2=80=
=9D HDD with
> sync-before-registering =3D true and to run =E2=80=98perf timechart recor=
d=E2=80=99 while
> it=E2=80=99s fetching a large number of substitutes. That way we=E2=80=
=99d 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 =E2=80=99guix gc=E2=80=99.
# test-58035/guix-daemon --build-users-group=3Dguixbuild
# perf timechart record
$ time guix build -m some-packages.scm
# perf timechart --highlight guix
1/ sync-before-registering =3D 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 =3D true
real 19m46.470s
user 0m12.367s
sys 0m0.557s=20=20=20=20=20=20
[ 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=3Ddownload&token=3D0e861286-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 =3D 8 * 1024 * 1024;
fsyncMetadata =3D true;
useSQLiteWAL =3D true;
- syncBeforeRegistering =3D false;
+ syncBeforeRegistering =3D true;
useSubstitutes =3D true;
useChroot =3D false;
impersonateLinux26 =3D false;
--8<---------------cut here---------------end--------------->8---
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Subject: Re: [bug#58035] sync-before-registering is false, possibly the cause
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Hi,
zimoun <zimon.toutoune@HIDDEN> skribis:
> 3x time slower with my hardware. Closing?
Ouch!
> On mar., 04 oct. 2022 at 23:49, Ludovic Court=C3=A8s <ludo@HIDDEN> wrote:
>
>> Maybe a good test would be to run a daemon on an =E2=80=9Caverage=E2=80=
=9D HDD with
>> sync-before-registering =3D true and to run =E2=80=98perf timechart reco=
rd=E2=80=99 while
>> it=E2=80=99s fetching a large number of substitutes. That way we=E2=80=
=99d 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 =E2=80=99guix gc=E2=80=99.
>
> # test-58035/guix-daemon --build-users-group=3Dguixbuild
> # perf timechart record
> $ time guix build -m some-packages.scm
> # perf timechart --highlight guix
OK.
> 1/ sync-before-registering =3D 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 =3D true
>
> real 19m46.470s
> user 0m12.367s
> sys 0m0.557s=20=20=20=20=20=20
>
> [ perf record: Woken up 2625 times to write data ]
> [ perf record: Captured and wrote 658.066 MB perf.data (6712342 samples) ]
That speaks for itself.
Let=E2=80=99s keep the bug open in case Maxime or someone else comes up wit=
h a
more practical fix.
Thanks,
Ludo=E2=80=99.
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