X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (mx1.hub.org [200.46.208.251]) by postgresql.org (Postfix) with ESMTP id 5A9019FA372 for ; Fri, 5 May 2006 10:44:11 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.208.251]) (amavisd-new, port 10024) with ESMTP id 37970-09 for ; Fri, 5 May 2006 10:44:02 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey- Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id 6D9739FA509 for ; Fri, 5 May 2006 10:44:02 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.13.6/8.13.6) with ESMTP id k45DhrTB023855; Fri, 5 May 2006 09:43:54 -0400 (EDT) To: "mcelroy, tim" cc: pgsql-performance@postgresql.org Subject: Re: Memory and/or cache issues? In-reply-to: <0C4841B42F87D51195BD00B0D020F5CB044B260B@MORPHEUS> References: <0C4841B42F87D51195BD00B0D020F5CB044B260B@MORPHEUS> Comments: In-reply-to "mcelroy, tim" message dated "Fri, 05 May 2006 09:26:34 -0400" Date: Fri, 05 May 2006 09:43:53 -0400 Message-ID: <23854.1146836633@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200605/108 X-Sequence-Number: 18895 "mcelroy, tim" writes: > I see this on all the postgres installations, no matter what I > set the postgresql.conf settings to regarding memory allocation, once > postgres starts up 95% of the memory on the box is used. Is there a way > within Linux to 'see' what or who is actually using this memory? Probably kernel disk cache. Are you under the misimpression that unused memory is a good thing? If a Unix-ish system *isn't* showing near zero free memory under load, the kernel is wasting valuable resources. regards, tom lane