Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.80) (envelope-from ) id 1Z1xSk-00016W-4C for pgsql-admin@arkaria.postgresql.org; Mon, 08 Jun 2015 13:51:38 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.80) (envelope-from ) id 1Z1xSj-0003M1-Hl for pgsql-admin@arkaria.postgresql.org; Mon, 08 Jun 2015 13:51:37 +0000 Received: from makus.postgresql.org ([2001:4800:1501:1::229]) by malur.postgresql.org with esmtps (TLS1.2:RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1Z1xSi-0003Lk-Gz for pgsql-admin@postgresql.org; Mon, 08 Jun 2015 13:51:36 +0000 Received: from mailout.easymail.ca ([64.68.201.169]) by makus.postgresql.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.84) (envelope-from ) id 1Z1xSf-00010u-NQ for pgsql-admin@postgresql.org; Mon, 08 Jun 2015 13:51:35 +0000 Received: from localhost (localhost [127.0.0.1]) by mailout.easymail.ca (Postfix) with ESMTP id E3EE1E105; Mon, 8 Jun 2015 09:51:32 -0400 (EDT) X-Virus-Scanned: Debian amavisd-new at mailout.easymail.ca X-Spam-Flag: NO X-Spam-Score: -3.87 X-Spam-Level: X-Spam-Status: No, score=-3.87 required=5 tests=[ALL_TRUSTED=-1.8, AWL=-0.163, BAYES_00=-2.599, DNS_FROM_AHBL_RHSBL=0.692] Received: from mailout.easymail.ca ([127.0.0.1]) by localhost (easymail-mailout.easydns.vpn [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XYuNgF-2sNd4; Mon, 8 Jun 2015 09:51:32 -0400 (EDT) Received: from [192.168.2.16] (unknown [8.39.228.5]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mailout.easymail.ca (Postfix) with ESMTPSA id 76FC6E0F7; Mon, 8 Jun 2015 09:51:32 -0400 (EDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2098\)) Subject: Re: cache Memory From: Scott Ribe In-Reply-To: <24F2E095E199B041912675E4E3BBA011B097A342@WEXCPPA018.fhhnet.stadt.hamburg.de> Date: Mon, 8 Jun 2015 07:51:30 -0600 Cc: "pgsql-admin@postgresql.org" Content-Transfer-Encoding: quoted-printable Message-Id: References: <24F2E095E199B041912675E4E3BBA011B097A342@WEXCPPA018.fhhnet.stadt.hamburg.de> To: "AL-Temimi, Muthana" X-Mailer: Apple Mail (2.2098) X-Pg-Spam-Score: -2.6 (--) List-Archive: List-Help: List-ID: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Mailing-List: pgsql-admin Precedence: bulk Sender: pgsql-admin-owner@postgresql.org On Jun 8, 2015, at 7:23 AM, AL-Temimi, Muthana wrote: >=20 > we have postgresql 9.1 installed on Suse Enterprice Linux Server. The RAM= is 12GB, When the concurrent connections 275 reached the cached memory on= Server 5GB and when the concurrent increased into 305 increase also the ca= che memory 8.5GB. but when the concurrent connections decreased into for ex= ample 165 the cache memory not decreased. The question why? Did I mess some= thing the postgresql.conf >=20=20 > any help will be grateful.. Probably also good to confirm what you mean by "cache memory"--what exactly= are you measuring? For instance, if you're measuring the OS cache for the = file system, then no, it wouldn't be expected to ever decrease until someth= ing else needed the memory... --=20 Scott Ribe scott_ribe@elevated-dev.com http://www.elevated-dev.com/ https://www.linkedin.com/in/scottribe/ (303) 722-0567 voice --=20 Sent via pgsql-admin mailing list (pgsql-admin@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin