Received: from maia.hub.org (maia-2.hub.org [200.46.204.251]) by mail.postgresql.org (Postfix) with ESMTP id 9C3CDB5DBD4 for ; Tue, 17 May 2011 14:35:56 -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 90359-07 for ; Tue, 17 May 2011 17:35:28 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from mailhub1.renesys.com (mailhub1.ep.renesys.com [195.160.236.248]) by mail.postgresql.org (Postfix) with ESMTP id 86533B5DBC7 for ; Tue, 17 May 2011 14:35:22 -0300 (ADT) Received: from ops05.psm1.renesys.com (ops05.psm1.renesys.com [10.200.1.25]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mailhub1.renesys.com (Postfix) with ESMTP id 5EB41671A4; Tue, 17 May 2011 17:35:21 +0000 (UTC) Received: (from rouilj@localhost) by ops05.psm1.renesys.com (8.13.8/8.13.8/Submit) id p4HHZJWV002462; Tue, 17 May 2011 17:35:19 GMT Date: Tue, 17 May 2011 17:35:19 +0000 From: John Rouillard To: Jeff Cc: pgsql-performance@postgresql.org Subject: Re: Using pgiosim realistically Message-ID: <20110517173519.GH27218@renesys.com> References: <20110513210941.GX27218@renesys.com> <20110514170702.GC32389@staff-mud-56-27.rice.edu> <20110516131730.GA27218@renesys.com> <20110516170636.GB27218@renesys.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.20 (2009-06-14) X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=-1.91 tagged_above=-10 required=5 tests=BAYES_00=-1.9, T_RP_MATCHES_RCVD=-0.01 X-Spam-Level: X-Archive-Number: 201105/262 X-Sequence-Number: 43771 On Mon, May 16, 2011 at 01:54:06PM -0400, Jeff wrote: > Yep - you need multiple threads to get max throughput of your io. I am running: ~/pgiosim -c -b 100G -v -t4 file[0-9]* Will each thread move 100GB of data? I am seeing: 158.69%, 4260 read, 0 written, 3407.64kB/sec 425.95 iops Maybe the completion target percentage is off because of the threads? -- -- rouilj John Rouillard System Administrator Renesys Corporation 603-244-9084 (cell) 603-643-9300 x 111