Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757422AbXJCT1w (ORCPT ); Wed, 3 Oct 2007 15:27:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753700AbXJCT1p (ORCPT ); Wed, 3 Oct 2007 15:27:45 -0400 Received: from hpsmtp-eml16.kpnxchange.com ([213.75.38.116]:17260 "EHLO hpsmtp-eml16.kpnxchange.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753603AbXJCT1o convert rfc822-to-8bit (ORCPT ); Wed, 3 Oct 2007 15:27:44 -0400 From: Frans Pop To: LKML Subject: Decreasing stime running confuses top (was: top displaying 9999% CPU usage) Date: Wed, 3 Oct 2007 21:27:41 +0200 User-Agent: KMail/1.9.7 References: <200710031433.34504.elendil@planet.nl> In-Reply-To: Cc: "Ilpo =?utf-8?q?J=C3=A4rvinen?=" , "Alexander E. Patrakov" MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8BIT Content-Disposition: inline Message-Id: <200710032127.42147.elendil@planet.nl> X-OriginalArrivalTime: 03 Oct 2007 19:27:42.0547 (UTC) FILETIME=[77D18230:01C805F3] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1554 Lines: 43 On Wednesday 03 October 2007, you wrote: > On Wed, 3 Oct 2007, Ilpo Järvinen wrote: > > On Wed, 3 Oct 2007, Frans Pop wrote: > > > The only change is in 2 consecutive columns: "2911 502" -> "2912 > > > 500". Is processor usage calculated from those? Can someone explain > > > how? > > > > The latter seems to be utime ...decreasing. No wonder if arithmetics > > will give strange results (probably top is using unsigned delta?)... > > Hmm, minor miscounting from my side, stime seems more appropriate... Here is a series showing utime and stime for kontact over 2 minutes. Values were obtained using (identical values removed): $ while true; do awk '{print $14" "$15}' /proc/5269/stat; sleep 1; done | ts Oct 03 21:17:12 12220 1593 Oct 03 21:17:18 12221 1594 Oct 03 21:17:26 12222 1593 <-- Oct 03 21:17:34 12223 1594 Oct 03 21:17:43 12224 1594 Oct 03 21:17:51 12224 1595 Oct 03 21:17:59 12225 1596 Oct 03 21:18:07 12226 1595 <-- Oct 03 21:18:15 12227 1596 Oct 03 21:18:18 12228 1596 Oct 03 21:18:22 12229 1595 <-- Oct 03 21:18:31 12230 1596 Oct 03 21:18:39 12230 1597 Oct 03 21:18:44 12231 1597 Oct 03 21:18:48 12232 1596 <-- Oct 03 21:18:56 12233 1597 Oct 03 21:19:04 12234 1596 <-- Oct 03 21:19:11 12235 1597 So, is it normal that stime decreases sometimes or a kernel bug? /me expects the last... - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/