From owner-freebsd-hackers Thu Jan 30 16:39:25 2003 Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 87DDF37B401 for ; Thu, 30 Jan 2003 16:39:24 -0800 (PST) Received: from mail.cruzio.com (mail.cruzio.com [63.249.95.37]) by mx1.FreeBSD.org (Postfix) with ESMTP id D3C2943F3F for ; Thu, 30 Jan 2003 16:39:23 -0800 (PST) (envelope-from brucem@dsl3-63-249-66-35.cruzio.com) Received: from dsl3-63-249-66-35.cruzio.com (dsl3-63-249-66-35.cruzio.com [63.249.66.35]) by mail.cruzio.com with ESMTP id QAA06178 for ; Thu, 30 Jan 2003 16:39:18 -0800 (PST) Received: (from brucem@localhost) by dsl3-63-249-66-35.cruzio.com (8.11.3/8.11.3) id h0V19Jo00850 for freebsd-hackers@freebsd.org; Thu, 30 Jan 2003 17:09:19 -0800 (PST) (envelope-from brucem) Date: Thu, 30 Jan 2003 17:09:19 -0800 (PST) From: "Bruce R. Montague" Message-Id: <200301310109.h0V19Jo00850@dsl3-63-249-66-35.cruzio.com> To: freebsd-hackers@freebsd.org Subject: Re: Random disk cache expiry Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Hi, re: > If a file's access history were stored as a "hint" > associated with the file, then it would > be possible to make better up-front decisions about > how to allocate cache space. I believe at one time this was a hot area, and now maybe it is back. I vaguely recall a recent PhD in this area, you might want to contact him and get some up to date pointers (I think Tom Kroger spent some time at CMU looking at a lot of file access traces in this regard). I believe Tom modified a Linux filesystem to do just this and did a fair amount of benchmarking (which, of course, proved it (or at least his PhD ;) was useful)! In any case you might get some interesting starting refs if you are interested in this area... http://www.cse.ucsc.edu/~tmk/ http://csl.cse.ucsc.edu/prediction.shtml http://csl.cse.ucsc.edu/acme.shtml - bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message