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From: "Daniel P. Berrangé" <berrange@redhat.com>
To: Thomas Huth <thuth@redhat.com>
Cc: "Kyle Evans" <kevans@freebsd.org>,
	"Philippe Mathieu-Daudé" <f4bug@amsat.org>,
	"Wainer dos Santos Moschetta" <wainersm@redhat.com>,
	qemu-devel@nongnu.org, "Willian Rampazzo" <willianr@redhat.com>,
	"Stefan Hajnoczi" <stefanha@redhat.com>,
	"Alex Bennée" <alex.bennee@linaro.org>,
	"Warner Losh" <imp@bsdimp.com>
Subject: Re: [PATCH v3 4/6] gitlab-ci: Add ccache in $PATH and display statistics
Date: Fri, 21 May 2021 12:53:41 +0100	[thread overview]
Message-ID: <YKefRcVrr9Gtehlk@redhat.com> (raw)
In-Reply-To: <afa421f3-337a-c488-c767-b73aaf3780b8@redhat.com>

On Fri, May 21, 2021 at 01:02:51PM +0200, Thomas Huth wrote:
> On 21/05/2021 12.50, Daniel P. Berrangé wrote:
> > On Fri, May 21, 2021 at 12:48:21PM +0200, Thomas Huth wrote:
> > > On 20/05/2021 13.27, Philippe Mathieu-Daudé wrote:
> > > > +Stefan/Daniel
> > > > 
> > > > On 5/20/21 10:02 AM, Thomas Huth wrote:
> > > > > On 19/05/2021 20.45, Philippe Mathieu-Daudé wrote:
> > > > > > If a runner has ccache installed, use it and display statistics
> > > > > > at the end of the build.
> > > > > > 
> > > > > > Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> > > > > > ---
> > > > > >     .gitlab-ci.d/buildtest-template.yml | 5 +++++
> > > > > >     1 file changed, 5 insertions(+)
> > > > > > 
> > > > > > diff --git a/.gitlab-ci.d/buildtest-template.yml
> > > > > > b/.gitlab-ci.d/buildtest-template.yml
> > > > > > index f284d7a0eec..a625c697d3b 100644
> > > > > > --- a/.gitlab-ci.d/buildtest-template.yml
> > > > > > +++ b/.gitlab-ci.d/buildtest-template.yml
> > > > > > @@ -6,13 +6,18 @@
> > > > > >           then
> > > > > >             JOBS=$(sysctl -n hw.ncpu)
> > > > > >             MAKE=gmake
> > > > > > +        PATH=/usr/local/libexec/ccache:$PATH
> > > > > >             ;
> > > > > >           else
> > > > > >             JOBS=$(expr $(nproc) + 1)
> > > > > >             MAKE=make
> > > > > > +        PATH=/usr/lib/ccache:/usr/lib64/ccache:$PATH
> > > > > 
> > > > > That does not make sense for the shared runners yet. We first need
> > > > > something to enable the caching there - see my series "Use ccache in the
> > > > > gitlab-CI" from April (which is currently stalled unfortunately).
> > > > 
> > > > TL;DR: I don't think we should restrict our templates to shared runners.
> > > 
> > > I'm certainly not voting for restricting ourselves to only use shared
> > > runners here - but my concern is that this actually *slows* down the shared
> > > runners even more! (sorry, I should have elaborated on that in my previous
> > > mail already)
> > > 
> > > When I was experimenting with ccache in the shared runners, I saw that the
> > > jobs are running even slower with ccache enabled as long as the cache is not
> > > populated yet. You only get a speedup afterwards. So if you add this now
> > > without also adding the possibility to store the cache persistently, the
> > > shared runners will try to populate the cache each time just to throw away
> > > the results afterwards again. Thus all the shared runners only get slower
> > > without any real benefit here.
> > > 
> > > Thus we either need to get ccache working properly for the shared runners
> > > first, or you have to think of a different way of enabling ccache for the
> > > non-shared runners, so that it does not affect the shared runners
> > > negatively.
> > 
> > Is there anything functional holding up your previous full cccache support
> > series from last month ? Or is it just lack of reviews ?
> 
> It's basically the problems mentioned in the cover letter and Stefan's
> comment here:
> 
>  https://lists.gnu.org/archive/html/qemu-devel/2021-04/msg02219.html

I'm not sure I understand why Stefan thinks gitlab's caching doesn't
benefit ccache. We add ccache for libvirt GitLab CI, and AFAIR it
sped up our builds significantly.

Regards,
Daniel
-- 
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  reply	other threads:[~2021-05-21 11:54 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-19 18:45 [PATCH v3 0/6] gitlab-ci: Allow using FreeBSD runners Philippe Mathieu-Daudé
2021-05-19 18:45 ` [PATCH v3 1/6] gitlab-ci: Extract &environment_variables template Philippe Mathieu-Daudé
2021-05-19 19:12   ` Willian Rampazzo
2021-05-20 18:00   ` Wainer dos Santos Moschetta
2021-05-19 18:45 ` [PATCH v3 2/6] gitlab-ci: Adapt JOBS variable for FreeBSD runners Philippe Mathieu-Daudé
2021-05-19 19:11   ` Willian Rampazzo
2021-05-20  5:50   ` Thomas Huth
2021-05-20 18:18   ` Wainer dos Santos Moschetta
2021-05-20 20:02     ` Warner Losh
2021-05-19 18:45 ` [PATCH v3 3/6] gitlab-ci: Run GNU make via the $MAKE variable Philippe Mathieu-Daudé
2021-05-19 19:10   ` Willian Rampazzo
2021-05-20  7:56   ` Thomas Huth
2021-05-20 18:26   ` Wainer dos Santos Moschetta
2021-05-19 18:45 ` [PATCH v3 4/6] gitlab-ci: Add ccache in $PATH and display statistics Philippe Mathieu-Daudé
2021-05-19 19:14   ` Willian Rampazzo
2021-05-20  8:02   ` Thomas Huth
2021-05-20 11:27     ` Philippe Mathieu-Daudé
2021-05-21 10:48       ` Thomas Huth
2021-05-21 10:50         ` Daniel P. Berrangé
2021-05-21 11:02           ` Thomas Huth
2021-05-21 11:53             ` Daniel P. Berrangé [this message]
2021-05-21 12:27               ` Philippe Mathieu-Daudé
2021-05-21 12:52                 ` Daniel P. Berrangé
2021-05-21 14:21                   ` Philippe Mathieu-Daudé
2021-05-25  5:49                     ` Philippe Mathieu-Daudé
2021-05-24 13:51                   ` Stefan Hajnoczi
2021-05-25  5:50                     ` Philippe Mathieu-Daudé
2021-05-21 12:36             ` Willian Rampazzo
2021-05-21 13:02               ` Thomas Huth
2021-05-19 18:45 ` [PATCH v3 5/6] gitlab-ci: Simplify before/after script for Avocado based jobs Philippe Mathieu-Daudé
2021-05-19 19:42   ` Willian Rampazzo
2021-05-20  8:04   ` Thomas Huth
2021-05-19 18:45 ` [PATCH v3 6/6] gitlab-ci: Add FreeBSD jobs Philippe Mathieu-Daudé
2021-05-19 19:43   ` Willian Rampazzo

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