From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bram Stolk Subject: Wildly different output sizes between subsequent perf record runs. Date: Fri, 3 Nov 2017 18:57:01 -0700 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Return-path: Received: from mail-ua0-f176.google.com ([209.85.217.176]:44553 "EHLO mail-ua0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751400AbdKDB5D (ORCPT ); Fri, 3 Nov 2017 21:57:03 -0400 Received: by mail-ua0-f176.google.com with SMTP id f46so3137001uae.1 for ; Fri, 03 Nov 2017 18:57:02 -0700 (PDT) Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: linux-perf-users@vger.kernel.org If I do subsequent runs of 'perf record', both of which are identical, I sometimes get wildly different output sizes. https://gist.github.com/stolk/3666b2b4d4319764fdff4a2d4c619782 The binary did the same amount of work, and took the same amount of time to execute. This is with using perf from Ubuntu LTS.