linux-kernel - Re: [PATCH 1/9] perf bench: Add --repeat option

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Date:	Thu, 19 Jun 2014 20:03:57 -0700
From:	Davidlohr Bueso <davidlohr@...com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>, mitake@....info.waseda.ac.jp,
	Aswin Chandramouleeswaran <aswin@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/9] perf bench: Add --repeat option

On Thu, 2014-06-19 at 23:51 +0000, Namhyung Kim wrote:
> Hi Davidlohr,
> 
> On Thu, Jun 19, 2014 at 11:45 AM, Davidlohr Bueso <davidlohr@...com> wrote:
> > Hi Namhyung,
> >
> > On Thu, 2014-06-19 at 15:14 +0900, Namhyung Kim wrote:
> >> By adding a top-level option, I think it should be applied to all
> >> benchmaks - but I guess it only supports sched messaging and futex,
> >> right?
> >
> > Yes, for now only those. While there is opportunity for others to use it
> > as well (perhaps shed-pipe & memcpy/memset), I don't think *all*
> > benchmarks need multiple runs, ie: numa.
> 
> Hmm.. but it'd make users confusing if one runs the numa benchmark
> with -r 5 option but it only do a single run..

Yeah, it crossed my mind. For that to be addressed, we would have to
come up with a way to determine if the argument was passed, and just
inform the user that it is not [currently(?)] supported. Some
alternatives would be to (i) explicitly document it, and/or (ii) print
out the amount of runs that will be made and if that option is
supported. All in all I think we need a better infrastructure for such
things. 

I feel perf-bench suffers fundamental design issues and tries to cover
too much.

Thanks,
Davidlohr

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