From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Ahern Subject: perf, H/W counters - ESX hosted VM Date: Fri, 27 May 2011 13:33:54 -0600 Message-ID: <4DDFFCA2.8030100@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from mail-pz0-f46.google.com ([209.85.210.46]:39876 "EHLO mail-pz0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932098Ab1E0Td4 (ORCPT ); Fri, 27 May 2011 15:33:56 -0400 Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: "linux-perf-users@vger.kernel.org" , LKML Has anyone successfully used perf within an ESX VM? dmesg shows a PMU is discovered: dmesg | grep -i performance Performance Events: Nehalem/Corei7 events, Intel PMU driver. yet data from it is nonsensical: perf stat -v -- /tmp/a task-clock-msecs: 20593318 20593318 20593318 context-switches: 2 20593318 20593318 CPU-migrations: 0 20593318 20593318 page-faults: 387 20593318 20593318 cycles: 10737418235 20593318 20593318 instructions: 10737418235 20593318 20593318 cache-references: 10737418235 20593318 20593318 cache-misses: 10737418235 20593318 20593318 Performance counter stats for '/tmp/a': 20.593318 task-clock-msecs # 0.988 CPUs 2 context-switches # 0.000 M/sec 0 CPU-migrations # 0.000 M/sec 387 page-faults # 0.019 M/sec 10737418235 cycles # 521403.022 M/sec 10737418235 instructions # 1.000 IPC 10737418235 cache-references # 521403.022 M/sec 10737418235 cache-misses # 521403.022 M/sec 0.020837863 seconds time elapsed David /tmp/a -- a step above 'sleep 1' #!/bin/sh declare -i i=0; declare -i sum=0; while [ $i -lt 1000 ] do sum=$((sum + i)) i=$((i+1)) done echo "sum $sum"