From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: 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 19B92139083 for ; Wed, 22 Nov 2017 08:23:46 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id ED4D3E0E67; Wed, 22 Nov 2017 08:23:39 +0000 (UTC) Received: from smarthost01c.mail.zen.net.uk (smarthost01c.mail.zen.net.uk [212.23.1.5]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id 95FADE0E36 for ; Wed, 22 Nov 2017 08:23:39 +0000 (UTC) Received: from [82.69.83.178] (helo=mail.digimed.co.uk) by smarthost01c.mail.zen.net.uk with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1eHQJl-0000Mq-IJ for gentoo-user@lists.gentoo.org; Wed, 22 Nov 2017 08:23:37 +0000 Received: from digimed.co.uk (fenchurch.digimed.co.uk [192.168.1.6]) by mail.digimed.co.uk (Postfix) with ESMTPA id E4D3367330 for ; Wed, 22 Nov 2017 08:23:36 +0000 (GMT) Date: Wed, 22 Nov 2017 08:23:30 +0000 From: Neil Bothwick To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] is multi-core really worth it? Message-ID: <20171122082330.2ac995a7@digimed.co.uk> In-Reply-To: <20171122072601.GA18724@gentoo-tp> References: <6b5fbeca-453c-f103-5e4e-a8db83a6dabf@st.com> <20171122072601.GA18724@gentoo-tp> Organization: Digital Media Production X-Mailer: Claws Mail 3.15.1-dirty (GTK+ 2.24.31; x86_64-pc-linux-gnu) X-GPG-Fingerprint: 7260 0F33 97EC 2F1E 7667 FE37 BA6E 1A97 4375 1903 Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; boundary="Sig_/obf4Mm55VHb+VDHbtrtD5RU"; protocol="application/pgp-signature" X-Originating-smarthost01c-IP: [82.69.83.178] Feedback-ID: 82.69.83.178 X-Archives-Salt: ae46040d-8c6a-41de-92a1-92d4d7fd2116 X-Archives-Hash: cccc7477941384dcb1fe107d6ad54bb2 --Sig_/obf4Mm55VHb+VDHbtrtD5RU Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Wed, 22 Nov 2017 08:26:01 +0100, Jeremi Piotrowski wrote: > That being said: if you do a world rebuild you will have lots of > packages that spend ~40 seconds doing their autoconf run, only to build > 2-3 sources files. On an 8-core machine at work, I get good results > using parallel emerge jobs (emerge -jX). For your 6-core AMD CPU > (assuming it actually has 12 threads) I'd start with 'emerge -j3' and > MAKEOPTS=3D'-j12 -l16'. That should get you a nice speedup, but may > require a bit more ram. Instead of specifying a number of jobs with "-j 3" you can let portage work it out. On a similar system, I use=20 EMERGE_DEFAULT_OPTS=3D"--jobs --load-average 12" --=20 Neil Bothwick "An investment in knowledge always pays the best interest." - Benjamin Franklin --Sig_/obf4Mm55VHb+VDHbtrtD5RU Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEE8k9T/rX16EJxEKG692eFu0QSMJgFAloVNAIACgkQ92eFu0QS MJhMxBAAvA0sjmS2WYd8QT5IcoNX2PQxRZHHz6QtzaRoZ9mst30PkhPNXszIUEWW DTdI7/TqDG3+UclyJKSMfZDMsbDl+vZV3Zj0PwL1q8SQGD2mugDV3g2udaDQ4YgU OISCVpenXrOwtjEdmZ0fyZjy+iVuMtPhCXhbMwl6MZNaYo37EVknXMybOT54aIJf k1Oyn/wefznqFIiToza6GsMV25Oyf8k5PFqx2SXn4oIApQLH3zqIuc8n7uxwm+t2 tQR8c37nyX1/9IMy5ifjhckgPlWX+6hJ7BLuDounD0jwrOacl0WYJ0950b8kbq8a F24sb2ue8ENaQytvAc5n/CABP1DW1kYmRFRv7uUzz1lCnwXSIjfYlZodXROi2e7o H2/7xKYvIqoeLlFz7QdmaiDefqzt7wWiMxfSFtlUQhleS5if/1tqOvcKlbJYPY8i /DdOB3RD4vI1Sc5EpHNLFYd1PJdjNWzUOBe5igsjwYGaJbHL2U1ePq0ZjbS/t4UI mnOcHkqxgzdojqT7cQxigEdZB63cwu4tZ5oGBc6WfMGXXdIXMhoXoMcVTvpQoFH0 jHBON6gj/ISfleHp5ka0Jj8HyPKcDFE0abwywJ3pQReRCfdl7VWSUEUAQfxrCMRX 7fJo3ZekNRfiE3iYmKxdFX+7wjjJDfUlestVj8sU0Y22PV0yIL8= =CvXs -----END PGP SIGNATURE----- --Sig_/obf4Mm55VHb+VDHbtrtD5RU--