From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <gentoo-user+bounces-180843-garchives=archives.gentoo.org@lists.gentoo.org> Received: from lists.gentoo.org (pigeon.gentoo.org [208.92.234.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by finch.gentoo.org (Postfix) with ESMTPS id 42336139083 for <garchives@archives.gentoo.org>; Wed, 22 Nov 2017 06:50:32 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id E1EB3E0DC3; Wed, 22 Nov 2017 06:50:25 +0000 (UTC) Received: from mx07-00178001.pphosted.com (mx07-00178001.pphosted.com [62.209.51.94]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id 6AF0BE0D43 for <gentoo-user@lists.gentoo.org>; Wed, 22 Nov 2017 06:50:25 +0000 (UTC) Received: from pps.filterd (m0046037.ppops.net [127.0.0.1]) by mx07-.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id vAM6neZ7026110 for <gentoo-user@lists.gentoo.org>; Wed, 22 Nov 2017 07:50:20 +0100 Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 2ebxj4368q-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT) for <gentoo-user@lists.gentoo.org>; Wed, 22 Nov 2017 07:50:20 +0100 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id B9FC834 for <gentoo-user@lists.gentoo.org>; Wed, 22 Nov 2017 06:50:19 +0000 (GMT) Received: from Webmail-eu.st.com (sfhdag7node2.st.com [10.75.127.20]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 7D7A814AB for <gentoo-user@lists.gentoo.org>; Wed, 22 Nov 2017 06:50:19 +0000 (GMT) Received: from [10.50.186.1] (10.75.127.46) by SFHDAG7NODE2.st.com (10.75.127.20) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Wed, 22 Nov 2017 07:50:19 +0100 To: <gentoo-user@lists.gentoo.org> From: Raffaele Belardi <raffaele.belardi@st.com> Subject: [gentoo-user] is multi-core really worth it? Message-ID: <6b5fbeca-453c-f103-5e4e-a8db83a6dabf@st.com> Date: Wed, 22 Nov 2017 07:52:54 +0100 User-Agent: Mozilla/5.0 (X11; Linux i686; rv:52.0) Gecko/20100101 Firefox/52.0 SeaMonkey/2.49.4.0 Precedence: bulk List-Post: <mailto:gentoo-user@lists.gentoo.org> List-Help: <mailto:gentoo-user+help@lists.gentoo.org> List-Unsubscribe: <mailto:gentoo-user+unsubscribe@lists.gentoo.org> List-Subscribe: <mailto:gentoo-user+subscribe@lists.gentoo.org> List-Id: Gentoo Linux mail <gentoo-user.gentoo.org> X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.75.127.46] X-ClientProxiedBy: SFHDAG3NODE3.st.com (10.75.127.9) To SFHDAG7NODE2.st.com (10.75.127.20) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-11-22_02:,, signatures=0 X-Archives-Salt: c0b63bf7-c27a-456e-a9c1-4bc3955c3f6b X-Archives-Hash: 01238ace8ef881a0a5fbdac28be6e7be Hi, rebuilding system and world with gcc-7.2.0 on a 6-core AMD CPU I have the impression that most of the ebuilds limit parallel builds to 1, 2 or 3 threads. I'm aware it is only an impression, I did not spend the night monitoring the process, but nevertheless every time I checked the load was very low. Does anyone have real-world statistics of CPU usage based on gentoo world build? raffaele