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References: <20230629125838.1995751-1-christian.ehrhardt@canonical.com>
<5843892.MhkbZ0Pkbq@thomas>
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From: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Date: Thu, 6 Jul 2023 14:49:10 +0200
Message-ID: <CAATJJ0JFDNC7w7u7xXhjeZPFS=ZtLiUp0snHPrgZ2VQx84bX4g@mail.gmail.com>
Subject: Re: [PATCH] doc: ensure sphinx output is reproducible
To: Thomas Monjalon <thomas@monjalon.net>
Cc: dev <dev@dpdk.org>, Luca Boccassi <bluca@debian.org>,
david.marchand@redhat.com
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On Mon, Jul 3, 2023 at 5:29=E2=80=AFPM Thomas Monjalon <thomas@monjalon.net=
> wrote:
>
> 29/06/2023 14:58, christian.ehrhardt@canonical.com:
> > From: Christian Ehrhardt <christian.ehrhardt@canonical.com>
> >
> > By adding -j we build in parallel, to make building on multiprocessor
> > machines more effective. While that works it does also break
> > reproducible builds as the order of the sphinx generated searchindex.js
> > is depending on execution speed of the individual processes.
> [...]
> > -if Version(ver) >=3D Version('1.7'):
> > - sphinx_cmd +=3D ['-j', 'auto']
>
> What is the impact on build speed on an average machine?
Hi,
I haven't tested this in isolation as it was just a mandatory change
on the Debian/Ubuntu side.
And the time for exactly and only the doc build is hidden inside the
concurrency of meson.
But I can compare a full build [1] and a full build with the change [2].
That is an average build machine and it is 35 seconds slower with the
change to no more do doc builds in parallel.
[1]: https://launchpadlibrarian.net/673520160/buildlog_ubuntu-mantic-amd64.=
dpdk_22.11.2-2_BUILDING.txt.gz
[2]: https://launchpadlibrarian.net/674783718/buildlog_ubuntu-mantic-amd64.=
dpdk_22.11.2-3_BUILDING.txt.gz
--=20
Christian Ehrhardt
Senior Staff Engineer and acting Director, Ubuntu Server
Canonical Ltd