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([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id d5sm850701edu.12.2021.02.23.23.44.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 23 Feb 2021 23:44:49 -0800 (PST) Subject: Re: [PATCH 1/2] gitlab-ci.yml: Allow custom make parallelism To: Daniele Buono , qemu-devel@nongnu.org References: <20210222230106.7030-1-dbuono@linux.vnet.ibm.com> <20210222230106.7030-2-dbuono@linux.vnet.ibm.com> <20057039-92b4-5b0f-436d-7310e9e59dfe@redhat.com> <2209b899-4de1-5b8d-99de-0b993575c0a3@linux.vnet.ibm.com> From: Paolo Bonzini Message-ID: <0bed82c8-f40d-8a22-74e5-7eede5ef80c5@redhat.com> Date: Wed, 24 Feb 2021 08:44:48 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 MIME-Version: 1.0 In-Reply-To: <2209b899-4de1-5b8d-99de-0b993575c0a3@linux.vnet.ibm.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=pbonzini@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=63.128.21.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 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, NICE_REPLY_A=-0.001, 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: , Cc: =?UTF-8?Q?Alex_Benn=c3=a9e?= , Thomas Huth , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , Wainer dos Santos Moschetta Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 23/02/21 20:34, Daniele Buono wrote: > This works, but setting this value to 1 for everybody seems a bit too > restrictive. While the gitlab ci runners don't have enough memory for > this, that's not necessarily true for every build platform, and linking > multiple targets in parallel with LTO can result in a big save in time, > so I'd prefer a customizable way. > > How about adding a flag `--max-ld-procs` to configure to manually set > backend_max_links? Another possibility is to invoke "meson configure build -Dbackend_max_links=1" after configure. Paolo > This would also allow setting it up to any specific number above 1, > which looking at the Makefile seems to not be possible now: because of > how the -j flag is passed from make to ninja, a compilation is either > sequential or parallel based on #cpus