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

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Message-ID: <4DCD4FC5.8020608@gmail.com>
Date:	Fri, 13 May 2011 09:35:33 -0600
From:	David Ahern <dsahern@...il.com>
To:	Wim Heirman <wim@...rman.net>
CC:	linux-kernel@...r.kernel.org
Subject: Re: perf-stat per thread results



On 05/13/11 09:14, Wim Heirman 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? 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.

perf-stat requires changes to dump counters per thread; it currently
sums all threads into a single value.

> Or, alternatively, can I use perf record --stat and get an exact count
> for each performance counter?

perf-record does not read values from hardware counters.

David



> 
> Thanks,
> Wim Heirman
> Ghent University, Belgium
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