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[174.21.143.238]) by smtp.gmail.com with ESMTPSA id y5sm23804520pgl.85.2020.06.26.11.30.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 26 Jun 2020 11:30:34 -0700 (PDT) Subject: Re: [PATCH v1 12/18] tests/vm: allow us to take advantage of MTTCG To: =?UTF-8?Q?Alex_Benn=c3=a9e?= , qemu-devel@nongnu.org References: <20200622143204.12921-1-alex.bennee@linaro.org> <20200622143204.12921-13-alex.bennee@linaro.org> From: Richard Henderson Message-ID: <3ab77b68-9f5d-6b99-e226-df4abb186add@linaro.org> Date: Fri, 26 Jun 2020 11:30:32 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200622143204.12921-13-alex.bennee@linaro.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::644; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x644.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. 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, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN 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: fam@euphon.net, berrange@redhat.com, =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , f4bug@amsat.org, cota@braap.org, aurelien@aurel32.net Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 6/22/20 7:31 AM, Alex Bennée wrote: > if kvm_available(vmcls.arch): > return multiprocessing.cpu_count() // 2 > + elif os.uname().machine == "x86_64" and \ > + vmcls.arch in ["aarch64", "x86_64", "i386"]: > + # MTTCG is available on these arches and we can allow more cores. > + # But only up to a reasonable limit. User can always override > + # these limits with --jobs. > + return min(multiprocessing.cpu_count() // 2, 8) > else: And if multiprocessing.cpu_count() == 1? Seems like we should add max(count, 1) as well. r~