Received: from maia.hub.org (maia-2.hub.org [200.46.204.251]) by mail.postgresql.org (Postfix) with ESMTP id E11AC1337B99 for ; Fri, 8 Oct 2010 09:14:38 -0300 (ADT) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.204.251]) (amavisd-maia, port 10024) with ESMTP id 98063-03 for ; Fri, 8 Oct 2010 12:14:32 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from hrndva-omtalb.mail.rr.com (hrndva-omtalb.mail.rr.com [71.74.56.125]) by mail.postgresql.org (Postfix) with ESMTP id 932DA133729E for ; Fri, 8 Oct 2010 09:14:31 -0300 (ADT) X-Authority-Analysis: v=1.1 cv=vbQZhf6WRU4XF+4tPWNJEMYU0N1CowIjcRZ/qR/IBDs= c=1 sm=0 a=PWriTx3p5B0A:10 a=JRZeEW2aRuwA:10 a=8nJEP1OIZ-IA:10 a=RAii6je2cdnAH6ATCOpc6g==:17 a=_Ixf_7qHAAAA:8 a=sE5_jSMwwl_EDBu2niQA:9 a=0tL7FYm8fp0QkI8wIUmDd9P38GYA:4 a=wPNLvfGTeEIA:10 a=ryAo9hy1-OkA:10 a=6vsjEBoLwlAA:10 a=0tfO7MgyNwYA:10 a=RAii6je2cdnAH6ATCOpc6g==:117 X-Cloudmark-Score: 0 X-Originating-IP: 74.73.87.196 Received: from [74.73.87.196] ([74.73.87.196:51343] helo=[192.168.1.100]) by hrndva-oedge02.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTP id 58/65-23284-72B0FAC4; Fri, 08 Oct 2010 12:14:31 +0000 Message-ID: <4CAF0B27.3080808@vmsinfo.com> Date: Fri, 08 Oct 2010 08:14:31 -0400 From: Mladen Gogala Reply-To: mladen.gogala@vmsinfo.com Organization: VMS User-Agent: Thunderbird 2.0.0.24 (X11/20100912) MIME-Version: 1.0 To: "pgsql-novice@postgresql.org" Subject: Re: Asynchronous I/O in Postgres References: <4CAE6D12.9050301@vmsinfo.com> <4CAE914B.7050305@vmsinfo.com> In-Reply-To: <4CAE914B.7050305@vmsinfo.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=-1.9 tagged_above=-10 required=5 tests=BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001 X-Spam-Level: X-Archive-Number: 201010/55 X-Sequence-Number: 24027 Mladen Gogala wrote: > So, essentially, the process is reading block by block, in a sequence. > What, exactly, does "effective_io_concurrency" mean? > To rephrase my question, can anybody tell me where in the code is it used? -- Mladen Gogala Sr. Oracle DBA 1500 Broadway New York, NY 10036 (212) 329-5251 www.vmsinfo.com