From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: with ECARTIS (v1.0.0; list xfs); Wed, 30 May 2007 09:49:40 -0700 (PDT) Received: from oss.sgi.com (localhost [127.0.0.1]) by oss.sgi.com (8.12.10/8.12.10/SuSE Linux 0.7) with ESMTP id l4UGncWt027407 for ; Wed, 30 May 2007 09:49:38 -0700 Date: Wed, 30 May 2007 09:49:38 -0700 Message-Id: <200705301649.l4UGnckA027406@oss.sgi.com> From: "Michael Nishimoto" Subject: Reducing memory requirements for high extent xfs files Sender: xfs-bounce@oss.sgi.com Errors-to: xfs-bounce@oss.sgi.com List-Id: xfs To: xfs@oss.sgi.com Hello, Has anyone done any work or had thoughts on changes required to reduce the total memory footprint of high extent xfs files? Obviously, it is important to reduce fragmentation as files are generated and to regularly defrag files, but both of these alternatives are not complete solutions. To reduce memory consumption, xfs could bring in extents from disk as needed (or just before needed) and could free up mappings when certain extent ranges have not been recently accessed. A solution should become more aggressive about reclaiming extent mapping memory as free memory becomes limited. Michael ____________________________________________________________________