Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753303Ab2JVLCx (ORCPT ); Mon, 22 Oct 2012 07:02:53 -0400 Received: from mx1.redhat.com ([209.132.183.28]:60776 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752747Ab2JVLCw (ORCPT ); Mon, 22 Oct 2012 07:02:52 -0400 Message-ID: <508527D8.9020004@draigBrady.com> Date: Mon, 22 Oct 2012 12:02:48 +0100 From: =?ISO-8859-1?Q?P=E1draig_Brady?= User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120615 Thunderbird/13.0.1 MIME-Version: 1.0 To: abhishek agarwal CC: linux-kernel@vger.kernel.org Subject: Re: [Perf] Adding timeout option References: <5081B7F8.7040302@draigBrady.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1510 Lines: 46 On 10/21/2012 05:18 AM, abhishek agarwal wrote: > perfmon had "timeout" option and i guess, same do oprofile. > > On Sat, Oct 20, 2012 at 1:58 AM, P?draig Brady wrote: >> On 10/13/2012 08:54 AM, abhishek agarwal wrote: >>> >>> Hi folks.. >>> >>> I was thinking that why cant we have a timeout option in perf stat >>> command. The timeout feature will help us to profile a process for a >>> stipulated time (preferably in millisecs) and make perf stat return >>> after that time. >>> Eg: >>> >>> perf stat --timeout=10 sleep 100 >>> >>> This will make perf return and report stats after 10 ms... >>> >>> Hope anyone can shed some more light on the idea >> >> >> It seems preferable to use the timeout program to do this. >> Either sending a handled signal to the perf process like: >> >> timeout -s HUP 10 perf stat sleep 100 >> >> Or even better, just use that to kill the monitored process itself >> >> perf stat timeout 10 sleep 100 > sleep does not offer a good timeout resolution and it is not a good > option (according to me) either. sleep was just following on the command example. timeout(1) supports subsecond resolution, through timer_create (CLOCK_REALTIME...) and timeout indication through signals. thanks, P?draig. -- 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/