From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lists.gentoo.org ([140.105.134.102] helo=robin.gentoo.org) by nuthatch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1Gh67A-0003mp-C0 for garchives@archives.gentoo.org; Mon, 06 Nov 2006 15:10:21 +0000 Received: from robin.gentoo.org (localhost [127.0.0.1]) by robin.gentoo.org (8.13.8/8.13.8) with SMTP id kA6F6b6B004951; Mon, 6 Nov 2006 15:06:37 GMT Received: from smtp2.nildram.co.uk (smtp2.nildram.co.uk [195.112.4.54] (may be forged)) by robin.gentoo.org (8.13.8/8.13.8) with ESMTP id kA6F6a4Z031508 for ; Mon, 6 Nov 2006 15:06:36 GMT Received: from wstn.prhnet (prh.gotadsl.co.uk [81.6.251.123]) by smtp2.nildram.co.uk (Postfix) with ESMTP id 0EF162B9F22; Mon, 6 Nov 2006 15:06:30 +0000 (GMT) From: Peter Humphrey To: gentoo-amd64@lists.gentoo.org Subject: Re: [gentoo-amd64] Re: Unexpected side effect of GCC 4 Date: Mon, 6 Nov 2006 15:06:32 +0000 User-Agent: KMail/1.9.5 References: <200611050845.42865.prh@gotadsl.co.uk> <20061106124912.GI5921@randombit.net> <200611061359.33291.volker.armin.hemmann@tu-clausthal.de> In-Reply-To: <200611061359.33291.volker.armin.hemmann@tu-clausthal.de> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-amd64@gentoo.org Reply-to: gentoo-amd64@lists.gentoo.org MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200611061506.32157.prh@gotadsl.co.uk> X-Archives-Salt: a7fd30cd-2bfe-4e00-89cf-d2d06edd427f X-Archives-Hash: ab6d593f0b892dff7a98c5452cb31103 On Monday 06 November 2006 12:59, Hemmann, Volker Armin wrote: > On Monday 06 November 2006 13:49, Jack Lloyd wrote: > > On Mon, Nov 06, 2006 at 01:05:31PM +0100, Hemmann, Volker Armin wrote: > > > lets ask the other way round. Why should it speed up anything to have > > > X>number of cores? > > > > To account for I/O wait states > > and how often does something wait for io and how often does some data is > purged from the cache, because the other make instance is activated? The best way to find out is to test in your own circumstances. > When I switched from j2 to j1, compiling did not take any longer - but > the box way much more usable. Whereas when I changed from j3 to j5 on my 2 CPUs, compiling seemed to take less time and I didn't notice any effect on responsiveness. -- Rgds Peter -- gentoo-amd64@gentoo.org mailing list