From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264584AbTDZBjx (ORCPT ); Fri, 25 Apr 2003 21:39:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264585AbTDZBjx (ORCPT ); Fri, 25 Apr 2003 21:39:53 -0400 Received: from scaup.mail.pas.earthlink.net ([207.217.120.49]:56997 "EHLO scaup.mail.pas.earthlink.net") by vger.kernel.org with ESMTP id S264584AbTDZBjv (ORCPT ); Fri, 25 Apr 2003 21:39:51 -0400 Date: Fri, 25 Apr 2003 21:58:56 -0400 To: akpm@digeo.com Cc: linux-kernel@vger.kernel.org Subject: Re: [BENCHMARK] 2.5.68 and 2.5.68-mm2 Message-ID: <20030426015856.GA2286@rushmore> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.1i From: rwhron@earthlink.net Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org >> The autoconf-2.53 make/make check is a fork test. 2.5.68 >> is about 13% faster here. > I wonder why. Which fs was it? That was on ext2. There isn't much i/o on autoconf "make check". It's a lot of small perl scripts, m4 and gcc on tiny files. >> On the AIM7 database test, -mm2 was about 18% faster and > iirc, AIM7 is dominated by lots of O_SYNC writes. I'd have expected the > anticipatory scheduler to do worse. Odd. Which fs was it? That was ext2 too. > tiobench will create a bunch of processes, each growing a large file, all > in the same directory. > The benchmark is hitting a pathologoical case. Yeah, it's a problem, but > it's not as bad as tiobench indicates. Oracle doing reads/writes to preallocated, contiguous files is more important than tiobench. Oracle datafiles are typically created sequentially, which wouldn't exercise the pathology. I pay more attention the OSDL-DBT-3 and "Winmark I" numbers than the i/o stuff I run. (I look at my numbers more, but care about theirs more). What about the behavior where CPU utilization goes down as thread count goes up? Is she just i/o bound? Sequential Reads ext2 Num Kernel Thr Rate (CPU%) ---------- --- ----- ------ 2.5.68 8 36.65 18.04% 2.5.68-mm2 8 23.96 11.15% 2.5.68 256 34.10 16.88% 2.5.68-mm2 256 18.84 8.96% -- Randy Hron http://home.earthlink.net/~rwhron/kernel/bigbox.html