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 X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9216BC433E0 for ; Fri, 26 Jun 2020 19:38:50 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 5B12A206C0 for ; Fri, 26 Jun 2020 19:38:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="z03JrDm2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5B12A206C0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:60326 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jouBV-0005pn-K1 for qemu-devel@archiver.kernel.org; Fri, 26 Jun 2020 15:38:49 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:47402) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jouAj-0005PJ-8Y for qemu-devel@nongnu.org; Fri, 26 Jun 2020 15:38:01 -0400 Received: from mail-wr1-x442.google.com ([2a00:1450:4864:20::442]:36001) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jouAh-000763-MT for qemu-devel@nongnu.org; Fri, 26 Jun 2020 15:38:00 -0400 Received: by mail-wr1-x442.google.com with SMTP id k6so10565801wrn.3 for ; Fri, 26 Jun 2020 12:37:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=references:user-agent:from:to:cc:subject:in-reply-to:date :message-id:mime-version:content-transfer-encoding; bh=ZsSAEPLp4bw5RvaNyy7ruh1AxdqurEP2BqKjR4xwilw=; b=z03JrDm2HimK5At9qJqIeMsINmvxm6NsRA3nZohP1H7bXq4jB3DIKPkcE90Ti+ELsK Nl/XEsCC96kSG43arnZl49yjqVDzO+PrJW31UnYmS5B9ZYdm/UNO9hbZajNO+393pqN8 OXFRYzIUDyV2Kwm++JoEcwGB8bOMQOZydtPvnQk+PzlA/ZyOr3jqw6jnDmtHqbn0mT+G tIy341kndwHxFowpGGteMTefehnixhdJ93I7QrIgUqyjuuccaZBdKoOCwxLX+DbLD8Yi 2ExHghj834lQlx5/8K4MvRYVaCTp/YUXD51Eci5FFzF77pEMfotl4xP842fah+Gj0zQH 6wDQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:references:user-agent:from:to:cc:subject :in-reply-to:date:message-id:mime-version:content-transfer-encoding; bh=ZsSAEPLp4bw5RvaNyy7ruh1AxdqurEP2BqKjR4xwilw=; b=YJXbywYZjbMtuB0OOzkmZ5TL4k8rN95v/MVUcWXRLVKi6RhMKQZCd0f7F9VlxJMUmq egMQsHGvhHPFJWwvA0ApupQRAOafYvkztGKXpGWVWclq1FGhQA0xTnp8HttxmYl4xyvG /nMDuL6BZTyt2l8DngWeW8J8SHTTPDjZzphJ47kj1AUS63h1B/Nf9B0YcvIqOOPIkjkE bLgMRa1E1iFvQlvtvtUpIJcwd+gmkHC3+bQxMs4G9GIYXWH7caLktmLk1RhK8p2xquvE 1TS6/hvhGUbMcH/5MGZUkVwGwkiSXEEpXY4I4ZySlHMADSi/vMBIHZom2/iEY1xh2vb7 DphA== X-Gm-Message-State: AOAM5308Tdktesjos+hh97kRo3JqDefbqY+G83V6GYEwpTm4qCFv3cMS uz6Lfgi6xDveCheibTPvcY9xwg== X-Google-Smtp-Source: ABdhPJwPs1yQucwDe/bd7nvS4lU3d/hQDzg9pGI9mn9faSKujz4N9yqVSAxncxbIbRRnzUoD17ClLA== X-Received: by 2002:adf:ee05:: with SMTP id y5mr5462673wrn.185.1593200277854; Fri, 26 Jun 2020 12:37:57 -0700 (PDT) Received: from zen.linaroharston ([51.148.130.216]) by smtp.gmail.com with ESMTPSA id x5sm19075587wmg.2.2020.06.26.12.37.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Jun 2020 12:37:56 -0700 (PDT) Received: from zen (localhost [127.0.0.1]) by zen.linaroharston (Postfix) with ESMTP id E1F4F1FF7E; Fri, 26 Jun 2020 20:37:55 +0100 (BST) References: <20200622143204.12921-1-alex.bennee@linaro.org> <20200622143204.12921-13-alex.bennee@linaro.org> <3ab77b68-9f5d-6b99-e226-df4abb186add@linaro.org> User-agent: mu4e 1.5.3; emacs 28.0.50 From: Alex =?utf-8?Q?Benn=C3=A9e?= To: Richard Henderson Subject: Re: [PATCH v1 12/18] tests/vm: allow us to take advantage of MTTCG In-reply-to: <3ab77b68-9f5d-6b99-e226-df4abb186add@linaro.org> Date: Fri, 26 Jun 2020 20:37:55 +0100 Message-ID: <87pn9l62jw.fsf@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Received-SPF: pass client-ip=2a00:1450:4864:20::442; envelope-from=alex.bennee@linaro.org; helo=mail-wr1-x442.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, Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , qemu-devel@nongnu.org, f4bug@amsat.org, cota@braap.org, aurelien@aurel32.net Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Richard Henderson writes: > On 6/22/20 7:31 AM, Alex Benn=C3=A9e wrote: >> if kvm_available(vmcls.arch): >> return multiprocessing.cpu_count() // 2 >> + elif os.uname().machine =3D=3D "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 overri= de >> + # these limits with --jobs. >> + return min(multiprocessing.cpu_count() // 2, 8) >> else: > > And if multiprocessing.cpu_count() =3D=3D 1? > Seems like we should add max(count, 1) as well. Or maybe? min(math.ceil(multiprocessing.cpu_count() / 2), 8) > > > r~ --=20 Alex Benn=C3=A9e