Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.80) (envelope-from ) id 1YnSdz-0001GX-3W for pgsql-performance@arkaria.postgresql.org; Wed, 29 Apr 2015 14:07:19 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.80) (envelope-from ) id 1YnSdy-0007gx-0E for pgsql-performance@arkaria.postgresql.org; Wed, 29 Apr 2015 14:07:18 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1YnSdv-0007gl-Sb for pgsql-performance@postgresql.org; Wed, 29 Apr 2015 14:07:15 +0000 Received: from lists.commandprompt.com ([69.168.55.30]) by magus.postgresql.org with esmtp (Exim 4.80) (envelope-from ) id 1YnSdl-0003Si-C8 for pgsql-performance@postgresql.org; Wed, 29 Apr 2015 14:07:14 +0000 Received: from [192.168.1.3] (spinlock.commandprompt.com [69.168.55.30]) by lists.commandprompt.com (Postfix) with ESMTPA id 7486310F; Wed, 29 Apr 2015 07:07:02 -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); 29 Apr 2015 07:07:02 -0700 Message-ID: <5540E588.9080507@commandprompt.com> Date: Wed, 29 Apr 2015 07:07:04 -0700 From: "Joshua D. Drake" Organization: Command Prompt, Inc. User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 MIME-Version: 1.0 To: Andres Freund , Jan Gunnar Dyrset CC: "pgsql-performance@postgresql.org" Subject: Re: PostgreSQL disk fragmentation causes performance problems on Windows References: <20150429080639.GC14535@awork2.anarazel.de> <20150429080854.GD14535@awork2.anarazel.de> In-Reply-To: <20150429080854.GD14535@awork2.anarazel.de> Content-Type: text/plain; charset=windows-1252; 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 m1-16422-10428 X-Assp-Envelope-From: jd@commandprompt.com X-Assp-Intended-For: pgsql-performance@postgresql.org X-Assp-Original-Subject: Re: [PERFORM] PostgreSQL disk fragmentation causes performance problemson Windows 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 04/29/2015 01:08 AM, Andres Freund wrote: >> Which OS and filesystem is this done on? Because many halfway modern >> systems, like e.g ext4 and xfs, implement this in the background as >> 'delayed allocation'. > > Oh, it's in the subject. Stupid me, sorry for that. I'd consider testing > how much better this behaves under a different operating system, as a > shorter term relief. This is a known issue on the Windows platform. It is part of the limitations of that environment. Linux/Solaris/FreeBSD do not suffer from this issue in nearly the same manner. jD -- Command Prompt, Inc. - http://www.commandprompt.com/ 503-667-4564 PostgreSQL Centered full stack support, consulting and development. Announcing "I'm offended" is basically telling the world you can't control your own emotions, so everyone else should do it for you. -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance