linux-kernel - Re: [PATCH 0/3] perf bench: Clean and add document for perf-bench

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Message-Id: <20091110.234306.265850902.mitake@dcl.info.waseda.ac.jp>
Date:	Tue, 10 Nov 2009 23:43:06 +0900 (JST)
From:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>
To:	mingo@...e.hu
Cc:	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	paulus@...ba.org, fweisbec@...il.com
Subject: Re: [PATCH 0/3] perf bench: Clean and add document for perf-bench

From: Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 0/3] perf bench: Clean and add document for perf-bench
Date: Tue, 10 Nov 2009 14:17:38 +0100

> Applied, thanks!
> 
> Btw., a small detail i noticed when running the pipe benchmark:
> 
> earth4:~/tip/tools/perf> ./perf bench sched pipe
> (executing 1000000 pipe operations between two tasks)
> 
> 	Total time:5.076 sec
> 		5.076232 usecs/op
> 		196996 ops/sec
> 
> when i typed 'perf bench sched pipe' nothing happened for several 
> seconds. The command did not finish and no output was printed.
> 
> This might surprise users - it's always good to print a single line that 
> we are processing a benchmark. Maybe this could be printed from the 
> generic subcommand, something like:
> 
>   running sched/pipe benchmark ...
> 
> What do you think?

Yeah, I have to admit that. Current style, keeping user wait
and print everything suddenly after finish, is not good.
I'll fix it.

And I also want to fix 

> 	Total time:5.076 sec
> 		5.076232 usecs/op
> 		196996 ops/sec

this style. This is too bad.
So I'll imitate style of perf-stat for making this format better.

   Hitoshi
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