From martinjonestechnology@googlemail.com Mon Jun 08 19:53:35 2009 Received: from mail-ew0-f213.google.com ([209.85.219.213]) by stoneboat.aleph1.co.uk with esmtp (Exim 4.69) (envelope-from ) id 1MDjyO-00066k-D1 for balloon@balloonboard.org; Mon, 08 Jun 2009 19:53:35 +0100 Received: by ewy9 with SMTP id 9so4417552ewy.13 for ; Mon, 08 Jun 2009 11:53:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=gamma; h=domainkey-signature:received:received:sender:message-id:date:from :user-agent:mime-version:to:subject:content-type :content-transfer-encoding; bh=aSEl9N7jBIff5fdpOiECtsYX4N5ot7VYV/4+KXfGXbU=; b=R87cFu2mwfKnHDQrIgrGPW2zwOIgs4W0aBXKKJwZaRDm+DawY8HpmoYHmTK0bqmwYB FTU827GX5Rjmw6dU5ag3l2Mb9bofXTA9FBYhLdC/uxLwNO2y7J44DreeNVsyN12GEVN6 IekkGFTB5pmKlBfB+sVzQ3tnulu7H3z8hvVi0= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=sender:message-id:date:from:user-agent:mime-version:to:subject :content-type:content-transfer-encoding; b=vX7MDgybEDzvU94dpAn07P1iFW5r6aNn+nzdWAqHYgpOcn9NNlMFqArB67Y1VcmgGt ep7qLzN13yus+HOgto7s0pRviTp3ETMS2sT3T3o9EmqaqcMMlQ5ue34CQ++ScwR3tBfD YYBUJUqHHtxg7U9ywjMvHXMXyTMUJVKXOi8Uo= Received: by 10.210.28.4 with SMTP id b4mr1598939ebb.28.1244487206678; Mon, 08 Jun 2009 11:53:26 -0700 (PDT) Received: from cox.local (cpc4-cmbg1-0-0-cust759.cmbg.cable.ntl.com [82.21.110.248]) by mx.google.com with ESMTPS id 28sm47901eye.26.2009.06.08.11.53.25 (version=SSLv3 cipher=RC4-MD5); Mon, 08 Jun 2009 11:53:26 -0700 (PDT) Sender: Chris Jones Message-ID: <4A2D5E25.40006@martin-jones.com> Date: Mon, 08 Jun 2009 19:53:25 +0100 From: Chris Jones User-Agent: Thunderbird 2.0.0.21 (Macintosh/20090302) MIME-Version: 1.0 To: balloon@balloonboard.org Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 209.85.219.213 X-SA-Exim-Mail-From: martinjonestechnology@googlemail.com X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on stoneboat.aleph1.co.uk X-Spam-Level: X-Spam-Status: No, score=-2.6 required=5.0 tests=AWL,BAYES_00,SPF_PASS autolearn=no version=3.2.5 X-SA-Exim-Version: 4.2.1 (built Wed, 25 Jun 2008 17:14:11 +0000) X-SA-Exim-Scanned: Yes (on stoneboat.aleph1.co.uk) Subject: [Balloon] Balloon software Makefile tweak - spend less time waiting X-BeenThere: balloon@balloonboard.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: Balloon List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 Jun 2009 18:53:35 -0000 Hi all, This afternoon I've added (yet) another variable into the Balloon software makefiles. I recommend setting it in your Makefile.local. It's called 'MAKEOPTS' and gets appended to appropriate Make command lines in the kernel and bootldr. It's intended to be set to '-j ' to cause Make to spawn off multiple jobs at the same time. This isn't always a good idea - for example, if the jobs are wget downloads - so it has to be used selectively. I've only put it in the Makefiles where it makes sense and a useful difference. It's only really useful on multi-processor machines but can give a good performance improvement. For example, a clean build of bootldr took 14.3 seconds with '-j 1' (the default setting) and 5.7 seconds with '-j 4' on a 4-core machine. It would be nice to extend this to the toolchain build in initrd, but that looked Hard so I haven't done it. I don't spend as much time building initrds anyway ;-) Chris -- Chris Jones - chris@martin-jones.com Martin-Jones Technology Ltd, makers of Solidlights 148 Catharine Street, Cambridge, CB1 3AR, UK Phone +44 (0) 1223 655611 Fax +44 (0) 870 112 3908 http://www.solidlights.co.uk/