From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B7D5CC3DA6F for ; Fri, 25 Aug 2023 08:12:57 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qZRvN-0002xf-0j; Fri, 25 Aug 2023 04:12:09 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qZRvJ-0002wC-6c for qemu-devel@nongnu.org; Fri, 25 Aug 2023 04:12:05 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qZRvF-0004kv-2e for qemu-devel@nongnu.org; Fri, 25 Aug 2023 04:12:04 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1692951119; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5Vq7SYLT8/3P8VktR6TGZbPAprcnDQ2P6BI9Ie+pqAw=; b=LGSXuV0aYMso7OuJZ3F3mdFh/p6DlhuEkWNiKfy2n7I6s7qHO5RPcpRtgbDhwrWS05KU1o urGUrbY+P4HnfQmmm/6OokRpW/OVnkrAP8TUmCuceIly8LorKj4sJV0/b9fCMgFBgQYOcB xIUfYMsPhID8ImwGuR4ppIgR7BGkBsI= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-687-8Od1pM6NOz629Q3CZcjpiw-1; Fri, 25 Aug 2023 04:11:55 -0400 X-MC-Unique: 8Od1pM6NOz629Q3CZcjpiw-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 71214185A792; Fri, 25 Aug 2023 08:11:54 +0000 (UTC) Received: from redhat.com (unknown [10.42.28.144]) by smtp.corp.redhat.com (Postfix) with ESMTPS id B975A140E962; Fri, 25 Aug 2023 08:11:51 +0000 (UTC) Date: Fri, 25 Aug 2023 09:11:49 +0100 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Michael Tokarev Cc: Alex =?utf-8?Q?Benn=C3=A9e?= , qemu-devel@nongnu.org, Beraldo Leal , Nicholas Piggin , Richard Henderson , Markus Armbruster , Yonggang Luo , qemu-ppc@nongnu.org, David Gibson , Daniel Henrique Barboza , qemu-s390x@nongnu.org, Akihiko Odaki , qemu-arm@nongnu.org, Juan Quintela , Thomas Huth , Peter Maydell , Ilya Leoshkevich , David Hildenbrand , Greg Kurz , Wainer dos Santos Moschetta , Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , =?utf-8?Q?C=C3=A9dric?= Le Goater Subject: Re: [PATCH v2 01/12] gitlab: enable ccache for many build jobs Message-ID: References: <20230824163910.1737079-1-alex.bennee@linaro.org> <20230824163910.1737079-2-alex.bennee@linaro.org> <20abecb3-b330-0303-0f4a-b0b5d0cfade1@tls.msk.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20abecb3-b330-0303-0f4a-b0b5d0cfade1@tls.msk.ru> User-Agent: Mutt/2.2.9 (2022-11-12) X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org 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 > > > > 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 -- |: 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 :|