From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932494AbWFUJYg (ORCPT ); Wed, 21 Jun 2006 05:24:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932495AbWFUJYg (ORCPT ); Wed, 21 Jun 2006 05:24:36 -0400 Received: from cantor.suse.de ([195.135.220.2]:26816 "EHLO mx1.suse.de") by vger.kernel.org with ESMTP id S932494AbWFUJYf (ORCPT ); Wed, 21 Jun 2006 05:24:35 -0400 To: art@usfltd.com Cc: linux-kernel@vger.kernel.org Subject: Re: kernel-x64-smp-multiprocessor-time util problem References: <20060619180413.qlgd1oj9etmosckg@69.222.0.225> From: Andi Kleen Date: 21 Jun 2006 11:24:30 +0200 In-Reply-To: <20060619180413.qlgd1oj9etmosckg@69.222.0.225> Message-ID: User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org art@usfltd.com writes: > on dual core amd-athlon under 64bit-smp core > > kernel compilation time: > > time make -j 8 > ... > LD [M] sound/usb/snd-usb-lib.ko > LD [M] sound/usb/usx2y/snd-usb-usx2y.ko > > real 18m0.948s > user 26m6.270s ------bad > sys 4m22.256s ------?bad > [xxx@localhost linux-2.6.17]$ > --- real-clock time is ~18 min -- user and system time doubled? user/sys accounts how much time the individual CPUs spent on your job. real counts how far your wall clock advanced. Think about it. It's not that difficult to understand. -Andi