Received: from makus.postgresql.org (makus.postgresql.org [98.129.198.125]) by mail.postgresql.org (Postfix) with ESMTP id 3FA1616AF4E5 for ; Mon, 30 Jul 2012 14:27:14 -0300 (ADT) Received: from momjian.us ([72.94.173.45]) by makus.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1SvtkP-0002Nh-3C for pgsql-performance@postgresql.org; Mon, 30 Jul 2012 17:27:13 +0000 Received: from bruce by momjian.us with local (Exim 4.72) (envelope-from ) id 1SvtkA-0004q7-AY; Mon, 30 Jul 2012 13:26:58 -0400 Date: Mon, 30 Jul 2012 13:26:58 -0400 From: Bruce Momjian To: Kevin Grittner Cc: Greg Smith , pgsql-performance@postgresql.org Subject: Re: Linux memory zone reclaim Message-ID: <20120730172658.GD10876@momjian.us> References: <500616CB.3070408@2ndQuadrant.com> <501673680200002500049227@gw.wicourts.gov> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <501673680200002500049227@gw.wicourts.gov> User-Agent: Mutt/1.5.20 (2009-06-14) X-Pg-Spam-Score: -1.9 (-) X-Archive-Number: 201207/354 X-Sequence-Number: 47535 > node distances: > node 0 1 2 3 > 0: 10 11 11 11 > 1: 11 10 11 11 > 2: 11 11 10 11 > 3: 11 11 11 10 > > When considering a hardware purchase, it might be wise to pay close > attention to how "far" a core may need to go to get to the most > "distant" RAM. Yikes, my server is certainly asymmetric: node distances: node 0 1 0: 10 21 1: 21 10 and my Debian Squeeze certainly knows that: $ cat < /proc/sys/vm/zone_reclaim_mode 1 Server specs: http://momjian.us/main/blogs/pgblog/2012.html#January_20_2012 I have 12 2GB DDR3 DIMs. Of course, my home server is ridiculously idle too. :-) -- Bruce Momjian http://momjian.us EnterpriseDB http://enterprisedb.com + It's impossible for everything to be true. +