From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751529Ab3KSGyr (ORCPT ); Tue, 19 Nov 2013 01:54:47 -0500 Received: from mail-ee0-f54.google.com ([74.125.83.54]:59467 "EHLO mail-ee0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750771Ab3KSGyq (ORCPT ); Tue, 19 Nov 2013 01:54:46 -0500 Date: Tue, 19 Nov 2013 07:54:43 +0100 From: Ingo Molnar To: Namhyung Kim Cc: Peter Zijlstra , David Ahern , Arnaldo Carvalho de Melo , linux-kernel@vger.kernel.org, jolsa@redhat.com, Frederic Weisbecker , Mike Galbraith , Stephane Eranian Subject: Re: [PATCH 4/5] perf record: mmap output file - v5 Message-ID: <20131119065443.GA32367@gmail.com> References: <20131112145707.GV5056@laptop.programming.kicks-ass.net> <20131112150751.GA19321@ghostprotocols.net> <20131112151944.GX5056@laptop.programming.kicks-ass.net> <52824AE3.4050207@gmail.com> <20131112211121.GC25913@gmail.com> <20131113113439.GI21461@twins.programming.kicks-ass.net> <52864ED1.1080607@gmail.com> <20131118090117.GE3866@twins.programming.kicks-ass.net> <20131118094036.GA26251@gmail.com> <877gc5utkf.fsf@sejong.aot.lge.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <877gc5utkf.fsf@sejong.aot.lge.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Namhyung Kim wrote: > > Well, with 1 khz sampling of a single threaded workload it's 8MB > > per second - that's 80 MB for 10 seconds profiling - not the end > > of the world. > > We now use 4 khz sampling frequency by default, just FYI. :) Yes, but if someone samples with 1 khz that's still plenty enough for a long enough run. With 4k sampling you coul do 2.5 seconds of profiling and still have 80 MB of data :-) Thanks, Ingo