Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.80) (envelope-from ) id 1YXBiq-0000Zi-UT for pgsql-performance@arkaria.postgresql.org; Sun, 15 Mar 2015 16:49:05 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.80) (envelope-from ) id 1YXBiq-0008Ud-95 for pgsql-performance@arkaria.postgresql.org; Sun, 15 Mar 2015 16:49:04 +0000 Received: from makus.postgresql.org ([2001:4800:1501:1::229]) by malur.postgresql.org with esmtps (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1YXBio-0008R1-Au for pgsql-performance@postgresql.org; Sun, 15 Mar 2015 16:49:02 +0000 Received: from lists.commandprompt.com ([69.168.55.30]) by makus.postgresql.org with esmtp (Exim 4.80) (envelope-from ) id 1YXBik-0001L3-IZ for pgsql-performance@postgresql.org; Sun, 15 Mar 2015 16:48:59 +0000 Received: from [192.168.1.3] (spinlock.commandprompt.com [69.168.55.30]) by lists.commandprompt.com (Postfix) with ESMTPA id 3A0E12E2; Sun, 15 Mar 2015 09:48:56 -0700 (PDT) Received: from [192.168.1.3] ([67.168.169.165] helo=[192.168.1.3]) by assp.commandprompt.com with ESMTPS(AES128-SHA) (2.1.1); 15 Mar 2015 09:48:55 -0700 Message-ID: <5505B7FD.3020803@commandprompt.com> Date: Sun, 15 Mar 2015 09:49:01 -0700 From: "Joshua D. Drake" Organization: Command Prompt, Inc. User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 MIME-Version: 1.0 To: Scott Marlowe , Andres Freund CC: Robert Kaye , Josh Krupka , PostgreSQL Performance Subject: Re: MusicBrainz postgres performance issues References: <9E71CCBE-4CDF-482E-878D-6C16027B6283@musicbrainz.org> <20150315135022.GC19792@alap3.anarazel.de> In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Assp-Version: 2.1.1(11364) on assp.commandprompt.com X-Assp-Client-SSL: yes X-Assp-ID: assp.commandprompt.com m1-38136-00093 X-Assp-Envelope-From: jd@commandprompt.com X-Assp-Intended-For: pgsql-performance@postgresql.org X-Assp-Original-Subject: Re: [PERFORM] MusicBrainz postgres performance issues X-Pg-Spam-Score: -1.9 (-) List-Archive: List-Help: List-ID: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Mailing-List: pgsql-performance Precedence: bulk Sender: pgsql-performance-owner@postgresql.org On 03/15/2015 09:43 AM, Scott Marlowe wrote: >> * Consider installing perf (linux-utils-$something) and doing a >> systemwide profile. >> >> 3.2 isn't the greatest kernel around, efficiency wise. At some point you >> might want to upgrade to something newer. I've seen remarkable >> differences around this. Not at some point, now. 3.2 - 3.8 are undeniably broken for PostgreSQL. > > That is an understatement. Here's a nice article on why it's borked: > > http://www.databasesoup.com/2014/09/why-you-need-to-avoid-linux-kernel-32.html > > Had a 32 core machine with big RAID BBU and 512GB memory that was > dying using 3.2 kernel. went to 3.11 and it went from a load of 20 to > 40 to a load of 5. Yep, I can confirm this behavior. > >> You really should upgrade postgres to a newer major version one of these >> days. Especially 9.2. can give you a remarkable improvement in >> performance with many connections in a read mostly workload. Seconded. JD -- Command Prompt, Inc. - http://www.commandprompt.com/ 503-667-4564 PostgreSQL Support, Training, Professional Services and Development High Availability, Oracle Conversion, @cmdpromptinc Now I get it: your service is designed for a customer base that grew up with Facebook, watches Japanese seizure robot anime, and has the attention span of a gnat. I'm not that user., "Tyler Riddle" -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance