Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 14 Jan 2003 15:15:21 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 14 Jan 2003 15:15:21 -0500 Received: from chaos.analogic.com ([204.178.40.224]:62086 "EHLO chaos.analogic.com") by vger.kernel.org with ESMTP id ; Tue, 14 Jan 2003 15:15:15 -0500 Date: Tue, 14 Jan 2003 15:20:29 -0500 (EST) From: "Richard B. Johnson" Reply-To: root@chaos.analogic.com To: Maciej Soltysiak cc: linux-kernel@vger.kernel.org Subject: Re: timing an application In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: MULTIPART/MIXED; BOUNDARY="1678434306-597853805-1042575629=:13840" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. Send mail to mime@docserver.cac.washington.edu for more info. --1678434306-597853805-1042575629=:13840 Content-Type: TEXT/PLAIN; charset=US-ASCII On Tue, 14 Jan 2003, Maciej Soltysiak wrote: > Hi, > > being inspired by some book about optimizing c++ code i decided to do > timing of functions i wrote. I am using gettimeofday to set > two timeval structs and calculate the time between them. > But the results depend heavily on the load, also i reckon that this > is an innacurate timing. > > Any ideas on timing a function, or a block of code? Maybe some kernel > timers or something. > > Regards, > Maciej Soltysiak > Easy! Use the rdtsc instruction to obtain the number of CPU cycles that occur between two subsequent calls. There will be some 'noise' because of interrupt activity so make many tests, put the results into an array, remove the slowest and the fastest, then average the remaining data. That's good enough for "government projects". Cheers, Dick Johnson Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips). Why is the government concerned about the lunatic fringe? 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