From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1RUxXD-0003CQ-7a for garchives@archives.gentoo.org; Mon, 28 Nov 2011 09:29:59 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 4A16A21C0B2; Mon, 28 Nov 2011 09:29:41 +0000 (UTC) Received: from mail.digimed.co.uk (82-69-83-178.dsl.in-addr.zen.co.uk [82.69.83.178]) by pigeon.gentoo.org (Postfix) with ESMTP id 92DB421C077 for ; Mon, 28 Nov 2011 09:27:51 +0000 (UTC) Received: from digimed.co.uk (yooden.digimed.co.uk [192.168.1.6]) by mail.digimed.co.uk (Postfix) with ESMTPSA id D7A528042D for ; Mon, 28 Nov 2011 09:27:50 +0000 (GMT) Date: Mon, 28 Nov 2011 09:27:44 +0000 From: Neil Bothwick To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] emerge -j, make -j and make -l Message-ID: <20111128092744.39f8e501@digimed.co.uk> In-Reply-To: References: Organization: Digital Media Production X-Mailer: Claws Mail 3.7.10cvs103 (GTK+ 2.24.8; 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-SHA1; boundary="Sig_/p/V2U6/wj+5Jgq/iKEC=wyv"; protocol="application/pgp-signature" X-Archives-Salt: a2013735-5488-491b-b786-a73cecd9e9cf X-Archives-Hash: 130d6e8f839244da21621a371488483b --Sig_/p/V2U6/wj+5Jgq/iKEC=wyv Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Mon, 28 Nov 2011 12:26:48 +0700, Pandu Poluan wrote: > Just in case anyone wonders where the multiplier "1.6" comes from: >=20 > There had been a discussion somewhere (I forgot where exactly, sorry) > about load numbers. The final conclusion was that the ideal load number > for today's processors is 2*N, because with the out-of-order capability > of modern processors, two instructions can overlap in the pipeline, even > without hyperthreading. Is N the number of physical cores, or does it include hyperthreaded cores too? --=20 Neil Bothwick Forget the Joneses...I can't keep up with The Simpsons. --Sig_/p/V2U6/wj+5Jgq/iKEC=wyv Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) iEYEARECAAYFAk7TVBUACgkQum4al0N1GQMblgCfY2xo6WjJ4NA6UHXYRK5MFqtP ihUAoNW/fpmtw6yeQ7Mg9YxlLKV/6424 =40ta -----END PGP SIGNATURE----- --Sig_/p/V2U6/wj+5Jgq/iKEC=wyv--