X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (av.hub.org [200.46.204.144]) by svr1.postgresql.org (Postfix) with ESMTP id C4780D9E0E; Mon, 3 Oct 2005 18:53:43 -0300 (ADT) Received: from svr1.postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 48503-02; Mon, 3 Oct 2005 21:53:40 +0000 (GMT) Received: from vms040pub.verizon.net (vms040pub.verizon.net [206.46.252.40]) by svr1.postgresql.org (Postfix) with ESMTP id A4825D9AC5; Mon, 3 Oct 2005 18:53:40 -0300 (ADT) Received: from osgiliath.mathom.us ([70.108.61.78]) by vms040.mailsrvcs.net (Sun Java System Messaging Server 6.2 HotFix 0.04 (built Dec 24 2004)) with ESMTPA id <0INT00M7W0T9QHE0@vms040.mailsrvcs.net>; Mon, 03 Oct 2005 16:53:33 -0500 (CDT) Received: from localhost (localhost [127.0.0.1]) by osgiliath.mathom.us (Postfix) with ESMTP id CDDFD6003B9; Mon, 03 Oct 2005 17:53:32 -0400 (EDT) Received: from osgiliath.mathom.us ([127.0.0.1]) by localhost (osgiliath [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 21539-03-5; Mon, 03 Oct 2005 17:53:32 -0400 (EDT) Received: by osgiliath.mathom.us (Postfix, from userid 1000) id B06146000E9; Mon, 03 Oct 2005 17:53:32 -0400 (EDT) Date: Mon, 03 Oct 2005 17:53:32 -0400 From: Michael Stone Subject: Re: [HACKERS] A Better External Sort? In-reply-to: <200510031334.02030.josh@agliodbs.com> To: Josh Berkus Cc: pgsql-hackers@postgresql.org, pgsql-performance@postgresql.org Mail-Followup-To: Josh Berkus , pgsql-hackers@postgresql.org, pgsql-performance@postgresql.org Message-id: <20051003215332.GS2241@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: by amavisd-new-20030616-p10 (Debian) at mathom.us References: <31833713.1128111650174.JavaMail.root@elwamui-polski.atl.sa.earthlink.net> <200509301341.22795.josh@agliodbs.com> <20050930231032.GQ2241@mathom.us> <200510031334.02030.josh@agliodbs.com> User-Agent: Mutt/1.5.10i X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0.004 required=5 tests=[AWL=0.004] X-Spam-Level: X-Archive-Number: 200510/34 X-Sequence-Number: 14802 On Mon, Oct 03, 2005 at 01:34:01PM -0700, Josh Berkus wrote: >> >Realistically, you can't do better than about 25MB/s on a >> > single-threaded I/O on current Linux machines, >> >> What on earth gives you that idea? Did you drop a zero? > >Nope, LOTS of testing, at OSDL, GreenPlum and Sun. For comparison, A >Big-Name Proprietary Database doesn't get much more than that either. You seem to be talking about database IO, which isn't what you said.