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    SubjectRe: [PATCH v2 3/7] Adding general performance benchmarking subcommand to perf.
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    From: Ingo Molnar <mingo@elte.hu>
    Subject: Re: [PATCH v2 3/7] Adding general performance benchmarking subcommand to perf.
    Date: Mon, 9 Nov 2009 08:55:12 +0100

    >
    > * Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp> wrote:
    >
    > > From: Ingo Molnar <mingo@elte.hu>
    > > Subject: Re: [PATCH v2 3/7] Adding general performance benchmarking subcommand to perf.
    > > Date: Sun, 8 Nov 2009 12:30:13 +0100
    > >
    > > > > >
    > > > > > 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.
    > >
    > > It's good idea.
    > > I have to admit that reserving -s for simple output is not good idea.
    > > I'll do this.
    >
    > I think --format=simple will be used by scripts mostly, so it doesnt
    > matter that it's longer to type. We try to save the shorter options for
    > humans and be conservative with them.
    >
    > Another angle is coherency between different subcommands - and '-s' is
    > already used as -s/--sort in other perf subcommands, which does not
    > match up with the '-s/--simple' usage.
    >
    > We try to match what the Git project does here - a good deal of
    > infrastructure code in perf came from Git and i find Git very easy to
    > use and it's managed well.
    >
    > It's not a hard rule: not all option name incoherencies are fixable or
    > avoidable, and there's no big problem if something slips in - i just
    > wanted to mention so that you can keep an eye on it when developing new
    > features for perf bench.
    >
    > Ingo
    >

    I added --format as option of bench subcommand,
    not of each suites.
    Because I thought that flavors of formatting are common thing
    across the suites.

    Example of use:
    % ./perf bench sched pipe # with no style specify
    (executing 1000000 pipe operations between two tasks)

    Total time:5.855 sec
    5.855061 usecs/op
    170792 ops/sec
    % ./perf bench --format=simple sched pipe # specified simple
    ^^^^^^^^^^^^^^^ # <- --format is here
    5.988

    How do you think?
    I'll send patch series later.



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