From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 18 Jan 2001 19:26:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 18 Jan 2001 19:25:59 -0500 Received: from penguin.e-mind.com ([195.223.140.120]:54650 "EHLO penguin.e-mind.com") by vger.kernel.org with ESMTP id ; Thu, 18 Jan 2001 19:25:48 -0500 Date: Fri, 19 Jan 2001 01:26:16 +0100 From: Andrea Arcangeli To: Mike Kravetz Cc: lse-tech@lists.sourceforge.net, linux-kernel@vger.kernel.org Subject: Re: multi-queue scheduler update Message-ID: <20010119012616.D32087@athlon.random> In-Reply-To: <20010118155311.B8637@w-mikek.des.sequent.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20010118155311.B8637@w-mikek.des.sequent.com>; from mkravetz@sequent.com on Thu, Jan 18, 2001 at 03:53:11PM -0800 X-GnuPG-Key-URL: http://e-mind.com/~andrea/aa.gnupg.asc X-PGP-Key-URL: http://e-mind.com/~andrea/aa.asc Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jan 18, 2001 at 03:53:11PM -0800, Mike Kravetz wrote: > Here are some very preliminary numbers from sched_test_yield > (which was previously posted to this (lse-tech) list by Bill > Hartner). Tests were run on a system with 8 700 MHz Pentium > III processors. > > microseconds/yield > # threads 2.2.16-22 2.4 2.4-multi-queue > ------------ --------- -------- --------------- > 16 18.740 4.603 1.455 I remeber the O(1) scheduler from Davide Libenzi was beating the mainline O(N) scheduler with over 7 tasks in the runqueue (actually I'm not sure if the number was 7 but certainly it was under 10). So if you also use a O(1) scheduler too as I guess (since you have a chance to run fast on the lots of tasks running case) the most interesting thing is how you score with 2/4/8 tasks in the runqueue (I think the tests on the O(1) scheduler patch was done at max on a 2-way SMP btw). (the argument for which Davide's patch wasn't included is that most machines have less than 4/5 tasks in the runqueue at the same time) Andrea - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/