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Message-ID: <20091103172926.GC11535@elte.hu>
Date: Tue, 3 Nov 2009 18:29:26 +0100
From: Ingo Molnar <mingo@...e.hu>
To: Hitoshi Mitake <mitake@....info.waseda.ac.jp>
Cc: linux-kernel@...r.kernel.org,
Rusty Russell <rusty@...tcorp.com.au>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Mike Galbraith <efault@....de>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Frédéric_Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH v2 3/7] Adding general performance benchmarking
subcommand to perf.
* Hitoshi Mitake <mitake@....info.waseda.ac.jp> wrote:
>
> Adding general performance benchmarking subcommand to perf.
> This patch adds bench/sched-pipe.c.
>
> bench/sched-pipe.c is a benchmark program
> to measure performance of pipe() system call.
> This benchmark is based on pipe-test-1m.c by Ingo Molnar.
> http://people.redhat.com/mingo/cfs-scheduler/tools/pipe-test-1m.c
>
> Example of use:
> % perf bench sched pipe # Use default options
> 4.575 # Result is time
> % perf bench sched pipe -l 2000 # This option means "loop 2000 counts"
> 0.024
ok, -l makes sense.
Shouldnt we output the unit of measurement, i.e. '4.575 usecs'? Also, we
should perhaps print something like:
% perf bench sched pipe
(executing 1000000 pipe operations between two tasks)
4.575 usecs per op
218579 ops/sec
?
Ingo
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