linux-kernel - Re: perf-stat per thread results

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Message-ID: <20110513153028.GC3854@elte.hu>
Date:	Fri, 13 May 2011 17:30:28 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Wim Heirman <wim@...rman.net>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frédéric Weisbecker <fweisbec@...il.com>
Subject: Re: perf-stat per thread results


* Wim Heirman <wim@...rman.net> wrote:

> Hi all,
> 
> I'm using perf-stat to look at hardware performance counters for a
> parallel program. Is there a way to get counter values for each thread
> individually, rather than aggregated for the whole process? [...]

Not at the moment, but it would be a useful feature.

> [...] I know I can attach to a specific thread using --tid=, but due to the 
> time required to find the tid and attach/detach this isn't accurate for 
> short-running programs. Or, alternatively, can I use perf record --stat and 
> get an exact count for each performance counter?

Yes perf record --stat should work. 'perf report -T --stdio' is supposed to 
print this, but it has regressed i think.

Arnaldo, any ideas?

Thanks,

	Ingo
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