X-Original-To: pgsql-hackers-postgresql.org@localhost.postgresql.org Received: from localhost (av.hub.org [200.46.204.144]) by postgresql.org (Postfix) with ESMTP id 0731B9DCC6B for ; Tue, 29 Nov 2005 00:09:41 -0400 (AST) Received: from postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 04146-07 for ; Tue, 29 Nov 2005 00:09:39 -0400 (AST) X-Greylist: from auto-whitelisted by SQLgrey- Received: from toad.mtbrook.bozemanpass.com (toad.mtbrook.bozemanpass.com [69.145.82.195]) by postgresql.org (Postfix) with ESMTP id 0D9659DCABA for ; Tue, 29 Nov 2005 00:09:38 -0400 (AST) Received: from [69.145.82.218] (unknown [69.145.82.218]) by toad.mtbrook.bozemanpass.com (Postfix) with ESMTP id EDCD81102E6 for ; Mon, 28 Nov 2005 20:09:37 -0800 (PST) Message-ID: <438BD493.3070507@boreham.org> Date: Mon, 28 Nov 2005 21:09:55 -0700 From: David Boreham Reply-To: david_list@boreham.org User-Agent: Mozilla Thunderbird 1.0 (Windows/20041206) X-Accept-Language: en-us, en MIME-Version: 1.0 To: pgsql-hackers@postgresql.org Subject: Re: ice-broker scan thread References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, score=0 required=5 tests=[AWL=0.000] X-Spam-Score: 0 X-Spam-Level: X-Archive-Number: 200511/1452 X-Sequence-Number: 76734 Gavin Sherry wrote: > MySQL, Oracle and others implement read-ahead threads to simulate async IO I always believed that Oracle used async file I/O. Not that I've seen their code, but I'm fairly sure they funded the addition of kernel aio to Linux a few years back. But....Oracle comes from a time long ago when threads and decent filesystems didn't exist, so some of the things they do may not be appropriate to add to a product that doesn't have them today. Now...network async I/O...that'd be really useful in my world...