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bh=+QgkDtYMKzdN9ujsO5G5A5BD8pmXKkGrzXgPsUzV3Ps=; b=g3dkORfD8oSgJCHhm8pbIlF4S1/ONkzqslNs2hLi9+EX9DoyOiOEsl0dhUIQoUiQ7/3tiI lMVtROq2HgOPT/aIJYqB6Webz3lHcUDOJGVPt1Rh5Ew+zAwQgbPn9m1S3Q8Kx/CSHdvT49 Rg/pxyFygHAbMmKt75X1NrxQObzf/uw= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-109-EY7K9eKJOBmbRTh_FY5Azw-1; Fri, 21 May 2021 06:51:17 -0400 X-MC-Unique: EY7K9eKJOBmbRTh_FY5Azw-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B3111E7B40; Fri, 21 May 2021 10:51:15 +0000 (UTC) Received: from redhat.com (ovpn-114-5.ams2.redhat.com [10.36.114.5]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 481185D9DE; Fri, 21 May 2021 10:51:02 +0000 (UTC) Date: Fri, 21 May 2021 11:50:58 +0100 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Thomas Huth Subject: Re: [PATCH v3 4/6] gitlab-ci: Add ccache in $PATH and display statistics Message-ID: References: <20210519184549.2192728-1-f4bug@amsat.org> <20210519184549.2192728-5-f4bug@amsat.org> <5a77ade3-1a6c-2389-4a1c-2c7c2266f298@redhat.com> <20c001a0-60ed-df08-b67d-884022e74d04@amsat.org> <396e75d2-fe22-3054-fbee-d6de02339b2a@redhat.com> MIME-Version: 1.0 In-Reply-To: <396e75d2-fe22-3054-fbee-d6de02339b2a@redhat.com> User-Agent: Mutt/2.0.7 (2021-05-04) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=berrange@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=216.205.24.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.39, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Cc: Kyle Evans , Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , Wainer dos Santos Moschetta , qemu-devel@nongnu.org, Willian Rampazzo , Stefan Hajnoczi , Alex =?utf-8?Q?Benn=C3=A9e?= , Warner Losh Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 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 > > > > --- > > > >   .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 ? Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|