X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (mx1.hub.org [200.46.208.251]) by postgresql.org (Postfix) with ESMTP id 2238C11F65DA for ; Thu, 27 Apr 2006 08:43:59 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.208.251]) (amavisd-new, port 10024) with ESMTP id 03934-05 for ; Thu, 27 Apr 2006 08:43:49 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey- Received: from vms046pub.verizon.net (vms046pub.verizon.net [206.46.252.46]) by postgresql.org (Postfix) with ESMTP id 4D59C11F65A1 for ; Thu, 27 Apr 2006 08:43:47 -0300 (ADT) Received: from osgiliath.mathom.us ([70.108.132.172]) by vms046.mailsrvcs.net (Sun Java System Messaging Server 6.2-4.02 (built Sep 9 2005)) with ESMTPA id <0IYD00EMNPWZ7B60@vms046.mailsrvcs.net> for pgsql-performance@postgresql.org; Thu, 27 Apr 2006 06:43:48 -0500 (CDT) Received: from localhost (localhost [127.0.0.1]) by osgiliath.mathom.us (Postfix) with ESMTP id B9F476E6A8; Thu, 27 Apr 2006 07:43:43 -0400 (EDT) Received: from osgiliath.mathom.us ([127.0.0.1]) by localhost (osgiliath.home.mathom.us [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 15816-01-5; Thu, 27 Apr 2006 07:43:43 -0400 (EDT) Received: by osgiliath.mathom.us (Postfix, from userid 1000) id F2C196E7A7; Thu, 27 Apr 2006 07:43:42 -0400 (EDT) Date: Thu, 27 Apr 2006 07:43:42 -0400 From: Michael Stone Subject: Re: Introducing a new linux readahead framework In-reply-to: <20060426144347.GA31328@mathom.us> To: pgsql-performance@postgresql.org, Wu Fengguang Mail-followup-to: pgsql-performance@postgresql.org, Wu Fengguang Message-id: <20060427114340.GE31328@mathom.us> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii; format=flowed Content-disposition: inline X-Pgp-Fingerprint: 53 FF 38 00 E7 DD 0A 9C 84 52 84 C5 EE DF 7C 88 X-Virus-Scanned: Debian amavisd-new at mathom.us References: <20060421013826.GA5217@mail.ustc.edu.cn> <20060426144347.GA31328@mathom.us> User-Agent: Mutt/1.5.11+cvs20060403 X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200604/631 X-Sequence-Number: 18715 On Wed, Apr 26, 2006 at 10:43:48AM -0400, Michael Stone wrote: >patch a 512k blocksize would get ~100MB/s. I'm now watching to see how >it does over a couple of days on real-world workloads. I've got one DB where the VACUUM ANALYZE generally takes 11M-12M ms; with the patch the job took 1.7M ms. Another VACUUM that normally takes between 300k-500k ms took 150k. Definately a promising addition. Mike Stone