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From: Ingo Molnar <mingo@elte.hu>
To: David Ahern <dsahern@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
	LKML <linux-kernel@vger.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: perf: h/w counters not counted and no error/info reported to user
Date: Fri, 27 May 2011 11:50:36 +0200	[thread overview]
Message-ID: <20110527095036.GK21386@elte.hu> (raw)
In-Reply-To: <4DDECFC8.7090903@gmail.com>


* David Ahern <dsahern@gmail.com> wrote:

> By default (tip-perf-core) perf-stat enables a number of H/W counters:
> 
> perf stat  -- sleep 1

did you mean to do 'perf stat -a sleep 1' ?

'perf stat sleep 1' in itself will only measure that very simple 
command - which does not do much.

Thanks,

	Ingo

  parent reply	other threads:[~2011-05-27  9:50 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-26 22:10 David Ahern
2011-05-27  6:31 ` Corey Ashford
2011-05-27  9:50 ` Ingo Molnar [this message]
2011-05-27 15:04   ` David Ahern
2011-05-27 16:36     ` David Ahern
2011-05-30 21:04       ` Ashwin Chaugule
2011-05-31  0:41         ` David Ahern
2011-05-30  8:22     ` Ingo Molnar

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