linux-kernel - Re: [PATCH v2 3/7] Adding general performance benchmarking subcommand to perf.

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Date:	Sun, 8 Nov 2009 12:30:13 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>
Cc:	linux-kernel@...r.kernel.org, rusty@...tcorp.com.au,
	tglx@...utronix.de, a.p.zijlstra@...llo.nl, efault@....de,
	acme@...hat.com, fweisbec@...il.com
Subject: Re: [PATCH v2 3/7] Adding general performance benchmarking
 subcommand to perf.


* Hitoshi Mitake <mitake@....info.waseda.ac.jp> wrote:

> From: Ingo Molnar <mingo@...e.hu>
> Subject: Re: [PATCH v2 3/7] Adding general performance benchmarking subcommand to perf.
> Date: Tue, 3 Nov 2009 18:29:26 +0100
> 
> > 
> > * 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   
> > 
> > ?
> 
> I have to admit that single float value output is too simple.
> So I'll fix the default output.
> 
> But, I believe that simple form makes sense for
> processing by scripts or graph tools like gnuplot.
> I'll add the option (may be --simple) to switch
> friendliness of outputs.

Btw., could you make it Git-ish, i.e.:

 --format=short

or:

 --format=simple

Eventually more format options might be added.

	Ingo
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