Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.80) (envelope-from ) id 1Ze0dP-0006az-GG for pgsql-hackers@arkaria.postgresql.org; Mon, 21 Sep 2015 12:55:55 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.84) (envelope-from ) id 1Ze0dO-0005El-L0 for pgsql-hackers@arkaria.postgresql.org; Mon, 21 Sep 2015 12:55:54 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.84) (envelope-from ) id 1Ze0dN-0005Ec-V4 for pgsql-hackers@postgresql.org; Mon, 21 Sep 2015 12:55:54 +0000 Received: from mx1.redhat.com ([209.132.183.28]) by magus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.84) (envelope-from ) id 1Ze0dK-0008IZ-2l for pgsql-hackers@postgresql.org; Mon, 21 Sep 2015 12:55:52 +0000 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) by mx1.redhat.com (Postfix) with ESMTPS id C9615A19CC; Mon, 21 Sep 2015 12:55:46 +0000 (UTC) Received: from localhost.localdomain (vpn-59-104.rdu2.redhat.com [10.10.59.104]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id t8LCtjuu010307 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Mon, 21 Sep 2015 08:55:46 -0400 Subject: Re: Speed up Clog Access by increasing CLOG buffers To: Amit Kapila References: <20150903114137.GE27649@awork2.anarazel.de> <55FC4C33.1050903@redhat.com> Cc: pgsql-hackers From: Jesper Pedersen Organization: JBoss, by Red Hat Message-ID: <55FFFE51.1060308@redhat.com> Date: Mon, 21 Sep 2015 08:55:45 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 X-Pg-Spam-Score: -6.9 (------) List-Archive: List-Help: List-ID: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Mailing-List: pgsql-hackers Precedence: bulk Sender: pgsql-hackers-owner@postgresql.org On 09/18/2015 11:11 PM, Amit Kapila wrote: >> I have done various runs on an Intel Xeon 28C/56T w/ 256Gb mem and 2 x >> RAID10 SSD (data + xlog) with Min(64,). >> >> > The benefit with this patch could be seen at somewhat higher > client-count as you can see in my initial mail, can you please > once try with client count > 64? > Client count were from 1 to 80. I did do one run with Min(128,) like you, but didn't see any difference in the result compared to Min(64,), so focused instead in the sync_commit on/off testing case. Best regards, Jesper -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers