From: "Daniel P. Berrangé" <berrange@redhat.com>
To: Michael Tokarev <mjt@tls.msk.ru>
Cc: "Alex Bennée" <alex.bennee@linaro.org>,
qemu-devel@nongnu.org, "Beraldo Leal" <bleal@redhat.com>,
"Nicholas Piggin" <npiggin@gmail.com>,
"Richard Henderson" <richard.henderson@linaro.org>,
"Markus Armbruster" <armbru@redhat.com>,
"Yonggang Luo" <luoyonggang@gmail.com>,
qemu-ppc@nongnu.org, "David Gibson" <david@gibson.dropbear.id.au>,
"Daniel Henrique Barboza" <danielhb413@gmail.com>,
qemu-s390x@nongnu.org, "Akihiko Odaki" <akihiko.odaki@daynix.com>,
qemu-arm@nongnu.org, "Juan Quintela" <quintela@redhat.com>,
"Thomas Huth" <thuth@redhat.com>,
"Peter Maydell" <peter.maydell@linaro.org>,
"Ilya Leoshkevich" <iii@linux.ibm.com>,
"David Hildenbrand" <david@redhat.com>,
"Greg Kurz" <groug@kaod.org>,
"Wainer dos Santos Moschetta" <wainersm@redhat.com>,
"Philippe Mathieu-Daudé" <philmd@linaro.org>,
"Cédric Le Goater" <clg@kaod.org>
Subject: Re: [PATCH v2 01/12] gitlab: enable ccache for many build jobs
Date: Fri, 25 Aug 2023 09:11:49 +0100 [thread overview]
Message-ID: <ZOhiRYxTQPSX0HbS@redhat.com> (raw)
In-Reply-To: <20abecb3-b330-0303-0f4a-b0b5d0cfade1@tls.msk.ru>
On Fri, Aug 25, 2023 at 10:46:29AM +0300, Michael Tokarev wrote:
> 24.08.2023 19:38, Alex Bennée wrote:
> > From: Daniel P. Berrangé <berrange@redhat.com>
> >
> > The `ccache` tool can be very effective at reducing compilation times
> > when re-running pipelines with only minor changes each time. For example
> > a fresh 'build-system-fedora' job will typically take 20 minutes on the
> > gitlab.com shared runners. With ccache this is reduced to as little as
> > 6 minutes.
>
> I've been using ccache when building qemu in debian, for quite a while.
>
> The problem here, in the way qemu build system works, is that the cache
> is hugely dependent on the path to the source. You change just one char
> in there (/build/qemu/v8.1.0/ => /build/qemu/v8.1.1) and whole cache becomes
> unusable, it all gets compiled anew. This is because qemu build sys uses
> absolute file names when building, and this is detected by ccache, so
> the source dir gets mixed into the hash together with gcc version and
> other things.
>
> Dunno how well this will work in the qemu ci though.
Should be fine, as gitlab always checks out code in a fixed directory
name matching the git repo name.
With regards,
Daniel
--
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next prev parent reply other threads:[~2023-08-25 8:12 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-24 16:38 [PATCH v2 00/12] gdbstub and testing fixes for 8.2 Alex Bennée
2023-08-24 16:38 ` [PATCH v2 01/12] gitlab: enable ccache for many build jobs Alex Bennée
2023-08-25 7:38 ` Philippe Mathieu-Daudé
2023-08-25 7:46 ` Michael Tokarev
2023-08-25 8:11 ` Daniel P. Berrangé [this message]
2023-08-25 8:34 ` Philippe Mathieu-Daudé
2023-08-25 8:43 ` Thomas Huth
2023-08-25 9:13 ` Michael Tokarev
2023-08-24 16:39 ` [PATCH v2 02/12] tests/docker: cleanup non-verbose output Alex Bennée
2023-08-24 16:39 ` [PATCH v2 03/12] tests/tcg: remove quoting for info output Alex Bennée
2023-08-24 16:39 ` [PATCH v2 04/12] docs/style: permit inline loop variables Alex Bennée
2023-08-24 16:39 ` [PATCH v2 05/12] .gitlab-ci.d/cirrus.yml: Update FreeBSD to v13.2 Alex Bennée
2023-08-24 16:39 ` [PATCH v2 06/12] tests: remove test-gdbstub.py Alex Bennée
2023-08-24 16:39 ` [PATCH v2 07/12] tests/tcg: clean-up gdb confirm/pagination settings Alex Bennée
2023-08-24 16:39 ` [PATCH v2 08/12] gdbstub: fixes cases where wrong threads were reported to GDB on SIGINT Alex Bennée
2023-08-24 16:39 ` [PATCH v2 09/12] gdbstub: remove unused user_ctx field Alex Bennée
2023-08-25 7:31 ` Philippe Mathieu-Daudé
2023-08-24 16:39 ` [PATCH v2 10/12] gdbstub: refactor get_feature_xml Alex Bennée
2023-08-24 19:25 ` Richard Henderson
2023-08-29 12:04 ` Alex Bennée
2023-08-24 16:39 ` [PATCH v2 11/12] gdbstub: replace global gdb_has_xml with a function Alex Bennée
2023-08-24 19:27 ` Richard Henderson
2023-08-25 7:33 ` Philippe Mathieu-Daudé
2023-08-24 16:39 ` [PATCH v2 12/12] gdbstub: move comment for gdb_register_coprocessor Alex Bennée
2023-08-24 19:29 ` Richard Henderson
2023-08-25 7:34 ` Philippe Mathieu-Daudé
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