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From: Wim Heirman <wim@heirman.net>
Date: Sat, 14 May 2011 14:49:28 +0200
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Subject: Re: perf-stat per thread results
To: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>, Arnaldo Carvalho de Melo <acme@redhat.com>,
        linux-kernel@vger.kernel.org, Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Thomas Gleixner <tglx@linutronix.de>,
        =?ISO-8859-1?Q?Fr=E9d=E9ric_Weisbecker?= <fweisbec@gmail.com>,
        Brice Goglin <Brice.Goglin@inria.fr>
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On 14 May 2011 01:02, David Ahern <dsahern@gmail.com> wrote:
>
>
> On 05/13/11 14:32, Wim Heirman wrote:
>> Hi,
>>
>>> 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).
>>
>> Regards,
>> Wim
>
> Hmm.... my mileage varies using latest kernel
> (446cc6345d3de6571bdd0840f48aca441488a28d)
>
> $ /tmp/build-perf/perf record --stat -fo /tmp/perf.data -p $(pidof rsyslogd)
> ^C[ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.007 MB /tmp/perf.data (~308 samples) ]
>
> $ /tmp/build-perf/perf report -T -i /tmp/perf.data
> # Events: 6 ?cycles
> #
> # Overhead ? Command ? ? ?Shared Object ? ? ? ? ? ? ? ? ? ? ?Symbol
> # ........ ?........ ?................. ?..........................
> #
> ? ?97.61% ?rsyslogd ?libc-2.13.so ? ? ? [.] __libc_disable_asynccancel
> ? ? 2.39% ?rsyslogd ?[kernel.kallsyms] ?[k] native_write_msr_safe
>
>
> #
> # (For a higher level overview, try: perf report --sort comm,dso)
> #
> # PID ?TID
>
>
> ie., I do not get the counter values. Specifying the counter with -e
> (e.g., -e branch-misses) does not help -- still no counter output.

Is rsyslogd multithreaded? (Or at least, do the non-main threads
execute any work during your perf-record measurement) If not, then
what you see is consistent with what I'm getting, i.e. everything but
the main thread is reported.

Regards,
Wim
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