From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752670Ab3AUJLe (ORCPT ); Mon, 21 Jan 2013 04:11:34 -0500 Received: from moutng.kundenserver.de ([212.227.17.10]:50383 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752479Ab3AUJLc (ORCPT ); Mon, 21 Jan 2013 04:11:32 -0500 Message-ID: <1358759476.4994.110.camel@marge.simpson.net> Subject: Re: [RFC PATCH 0/2] sched: simplify the select_task_rq_fair() From: Mike Galbraith To: Michael Wang Cc: linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, mingo@kernel.org, a.p.zijlstra@chello.nl Date: Mon, 21 Jan 2013 10:11:16 +0100 In-Reply-To: <50FD005C.8040402@linux.vnet.ibm.com> References: <1356588535-23251-1-git-send-email-wangyun@linux.vnet.ibm.com> <50ED384C.1030301@linux.vnet.ibm.com> <1357977704.6796.47.camel@marge.simpson.net> <1357985943.6796.55.camel@marge.simpson.net> <1358155290.5631.19.camel@marge.simpson.net> <50F79256.1010900@linux.vnet.ibm.com> <1358654997.5743.17.camel@marge.simpson.net> <50FCACE3.5000706@linux.vnet.ibm.com> <1358743128.4994.33.camel@marge.simpson.net> <50FCCCF5.30504@linux.vnet.ibm.com> <1358750523.4994.55.camel@marge.simpson.net> <50FCEF6C.6010801@linux.vnet.ibm.com> <1358756780.4994.104.camel@marge.simpson.net> <50FD005C.8040402@linux.vnet.ibm.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 X-Provags-ID: V02:K0:nKDOq5X2HC9yK10zMRDQhWdOZc3ci+juqyUwstF2Mbk de4fQtCXsVY//Yzl/ZSzS1F1ZoMCn8UPoRwB3JQXI7cALmhWKJ 266BksLWi1JpSwPB0LpJSW/RUBXr1cneryK8gQf855yFnYSHFO 797Xr2o++PY4n7pWvwEXypRCAlxFy+MrOkEQAPCHZoEnXakimU PgAeVlO3UPVekScieKlqRePFKcPIz/RBL5lYZs+iIePtwK+FlO vs4WfMhFE6vQtuMd4gTyEEY/yDGvTAWzdrpFmQ4Q/LTS/yl0W3 86K+tVyEN+LgRXqdMk/P15GCrkSju7hhYVOJKNLPh5cGsKK9tj j4Zg15V4qr5JIRpzMN/YhJemiw7pVwuNejJ7vhHqBViSdGG0HB xOn1C8jV6xC2g== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2013-01-21 at 16:46 +0800, Michael Wang wrote: > On 01/21/2013 04:26 PM, Mike Galbraith wrote: > > On Mon, 2013-01-21 at 15:34 +0800, Michael Wang wrote: > >> On 01/21/2013 02:42 PM, Mike Galbraith wrote: > >>> On Mon, 2013-01-21 at 13:07 +0800, Michael Wang wrote: > >>> > >>>> That seems like the default one, could you please show me the numbers in > >>>> your datapoint file? > >>> > >>> Yup, I do not touch the workfile. Datapoints is what you see in the > >>> tabulated result... > >>> > >>> 1 > >>> 1 > >>> 1 > >>> 5 > >>> 5 > >>> 5 > >>> 10 > >>> 10 > >>> 10 > >>> ... > >>> > >>> so it does three consecutive runs at each load level. I quiesce the > >>> box, set governor to performance, echo 250 32000 32 4096 > >>>> /proc/sys/kernel/sem, then ./multitask -nl -f, and point it > >>> at ./datapoints. > >> > >> I have changed the "/proc/sys/kernel/sem" to: > >> > >> 2000 2048000 256 1024 > >> > >> and run few rounds, seems like I can't reproduce this issue on my 12 cpu > >> X86 server: > >> > >> prev post > >> Tasks jobs/min jobs/min > >> 1 508.39 506.69 > >> 5 2792.63 2792.63 > >> 10 5454.55 5449.64 > >> 20 10262.49 10271.19 > >> 40 18089.55 18184.55 > >> 80 28995.22 28960.57 > >> 160 41365.19 41613.73 > >> 320 53099.67 52767.35 > >> 640 61308.88 61483.83 > >> 1280 66707.95 66484.96 > >> 2560 69736.58 69350.02 > >> > >> Almost nothing changed...I would like to find another machine and do the > >> test again later. > > > > Hm. Those numbers look odd. Ok, I've got 8 more cores, but your hefty > > load throughput is low. When I look low end numbers, seems your cores > > are more macho than my 2.27 GHz EX cores, so it should have been a lot > > closer. Oh wait, you said "12 cpu".. so 1 6 core package + HT? This > > box is 2 NUMA nodes (was 4), 2 (was 4) 10 core packages + HT. > > It's a 12 core package, and only 1 physical cpu: > > Intel(R) Xeon(R) CPU X5690 @ 3.47GHz > > So does that means the issue was related to the case when there are > multiple nodes? Seems likely. I had 4 nodes earlier though, and did NOT see collapse. -Mike