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

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Date:	Sat, 14 May 2011 14:45:44 +0200
From:	Wim Heirman <wim@...rman.net>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, David Ahern <dsahern@...il.com>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Brice Goglin <Brice.Goglin@...ia.fr>
Subject: Re: perf-stat per thread results

On 13 May 2011 22:45, Arnaldo Carvalho de Melo <acme@...hat.com> wrote:
> Em Fri, May 13, 2011 at 10:32:58PM +0200, Wim Heirman escreveu:
>> > It's supposed to do that if --stat is specified, and it used to work - see this
>> > commit:
>
>> >  8d51327090ac: perf report: Fix and improve the displaying of per-thread event counters
>
>> > and the output there:
>> >
>> >     #  PID   TID  cache-misses  cache-references
>> >       4658  4659        495581           3238779
>> >       4658  4662        498246           3236823
>> >       4658  4663        499531           3243162
>
>> > which appears to be roughly what Wim is asking for, AFAICT.
>
>> Thanks, this is exactly what I'm looking for. In 2.6.32 (Ubuntu 10.04)
>> it works, although if I use --pid rather than the -- <command> variant
>> the first thread seams to be missing. In 2.6.38 (Ubuntu 11.04) the
>> first thread is missing in both use cases, and I get one column per
>> processor (which in itself is fine).
>
> Can you try after applying the patches in this message:
>
> http://marc.info/?l=linux-kernel&m=130385067430510&w=2
>
> and report your results?

Sorry, no improvement.

$ ./perf record -e cycles --stat -- ./fft -p4 -m24 && ./perf report
--thread | tail
[ perf record: Woken up 5 times to write data ]
[ perf record: Captured and wrote 1.198 MB perf.data (~52331 samples) ]
# PID  TID   cpu-clock
  954  958  8067423322
  954  957  6761317556
  954  956  6006327147

$ ls /proc/$(pidof fft)/task
954  956  957  958
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