linux-kernel - Re: [PATCH 4/7] perf, tools, stat: Document CSV format in manpage

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Date:	Wed, 2 Mar 2016 12:23:46 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 4/7] perf, tools, stat: Document CSV format in manpage

On Tue, Mar 01, 2016 at 10:57:49AM -0800, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> With all the recently added fields in the perf stat CSV output
> we should finally document them in the man page. Do this here.
> 
> v2: Fix fields in documentation (Jiri)
> v3: fix order of fields again (Jiri)
> v4: Change order again.
> v5: Document more fields (Jiri)
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  tools/perf/Documentation/perf-stat.txt | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
> index 52ef7a9..de1586b 100644
> --- a/tools/perf/Documentation/perf-stat.txt
> +++ b/tools/perf/Documentation/perf-stat.txt
> @@ -211,6 +211,29 @@ $ perf stat -- make -j
>  
>   Wall-clock time elapsed:   719.554352 msecs
>  
> +CSV FORMAT
> +----------
> +
> +With -x, perf stat is able to output a not-quite-CSV format output
> +Commas in the output are not put into "". To make it easy to parse
> +it is recommended to use a different character like -x \;
> +
> +The fields are in this order:
> +
> +	- optional CPU, core, or socket identifier 
                                                  ^ trailing whitespace

> +	- optional number of cores aggregated
> +	- optional usec time stamp in fractions of second (with -I xxx)

the interval time should be the first item

[jolsa@...va perf]$ sudo ./perf stat --per-socket -a  -I 1000 -x, -e cycles
     1.000159610,S0,4,298027426,,cycles,4002819542,100.00
     1.409246878,S0,4,110643936,,cycles,1637336562,100.00

[jolsa@...va perf]$ sudo ./perf stat --per-core -a  -I 1000 -x, -e cycles
     1.000145489,S0-C0,2,130631326,,cycles,2001381034,100.00
     1.000145489,S0-C1,2,161500168,,cycles,2001374772,100.00
     1.448799712,S0-C0,2,102189718,,cycles,897831386,100.00
     1.448799712,S0-C1,2,112392552,,cycles,897832554,100.00

[jolsa@...va perf]$ sudo ./perf stat -A -a  -I 1000 -x, -e cycles
     1.000127414,CPU0,88288182,,cycles,1000705402,100.00
     1.000127414,CPU1,63578396,,cycles,1000704841,100.00

jirka

> +	- counter value
> +	- unit of the counter value or empty
> +	- event name
> +	- run time of counter
> +	- percentage of measurement time the counter was running
> +	- optional variance if multiple values are collected with -r
> +	- optional metric value
> +	- optional unit of metric
> +
> +Additional metrics may be printed with all earlier fields being empty.
> +
>  SEE ALSO
>  --------
>  linkperf:perf-top[1], linkperf:perf-list[1]
> -- 
> 2.5.0
>