This message generated a parse failure. Raw output follows here. Please use 'back' to navigate. From devnull@lkml.org Thu Apr 25 01:29:29 2024 Received: from spaans.ds9a.nl (adsl-xs4all.ds9a.nl [213.84.159.51]) by kylie.puddingonline.com (8.11.6/8.11.6) with SMTP id g8IIirX21473 for ; Wed, 18 Sep 2002 20:44:54 +0200 Received: (qmail 28889 invoked from network); 18 Sep 2002 06:32:17 -0000 Received: from unknown (HELO spaans.ds9a.nl) (3ffe:8280:10:360:202:44ff:fe2a:a1dd) by mayo.ipv6.ds9a.nl with SMTP; 18 Sep 2002 06:32:17 -0000 Received: (qmail 27406 invoked by uid 1000); 17 Sep 2002 19:59:36 -0000 Received: (maildatabase); juh Received: (qmail 13711 invoked by alias); 24 Jan 2001 12:33:21 -0000 Received: (qmail 13708 invoked from network); 24 Jan 2001 12:33:21 -0000 Received: from vger.kernel.org (199.183.24.194) by spaans.ds9a.nl with SMTP; 24 Jan 2001 12:33:21 -0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 24 Jan 2001 07:32:15 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 24 Jan 2001 07:32:06 -0500 Received: from hermes.mixx.net ([212.84.196.2]:29195 "HELO hermes.mixx.net") by vger.kernel.org with SMTP id ; Wed, 24 Jan 2001 07:31:50 -0500 Received: from mate.bln.innominate.de (cerberus.berlin.innominate.de [212.84.234.251]) by hermes.mixx.net (Postfix) with ESMTP id E01C7F80D; Wed, 24 Jan 2001 13:31:45 +0100 (CET) Received: from innominate.de (gimli.bln.innominate.de [10.0.0.90]) by mate.bln.innominate.de (Postfix) with ESMTP id 0D1CA2CA6F; Wed, 24 Jan 2001 13:31:36 +0100 (CET) Message-Id: <3A6ECA9A.AD9200E7@innominate.de> Date: Wed, 24 Jan 2001 13:29:14 +0100 From: Daniel Phillips Organization: innominate X-Mailer: Mozilla 4.72 [de] (X11; U; Linux 2.4.0-test10 i586) X-Accept-Language: en Mime-Version: 1.0 To: Joe deBlaquiere , linux-kernel@vger.kernel.org Subject: Re: more on scheduler benchmarks References: <20010122101738.B7427@w-mikek.des.sequent.com> <3A6CEB02.3050906@redhat.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org Joe deBlaquiere wrote: > > Maybe I've been off in the hardware lab for too long, but how about > > 1. using ioperm to give access to the parallel port. > 2. have your program write a byte (thread id % 256 ?) constantly to the > port during it's other activity > 3. capture the results from another computer with an ecp port > > This way you don't run the risk of altering the scheduler behavior with > your logging procedure. It's a technique I've used in debugging realtime systems. It works great, but bear in mind that the out to the parallel port costs an awful lot of cycles. You *will* alter the behaviour of the scheduler. -- Daniel - 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/