linux-kernel - Re: [PATCH 24/25] perf tools: Add multi file '-M' option for record command

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Date:	Mon, 02 Sep 2013 12:11:35 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 24/25] perf tools: Add multi file '-M' option for record
 command

On 02/09/13 11:37, Jiri Olsa wrote:
> On Mon, Sep 02, 2013 at 10:52:46AM +0300, Adrian Hunter wrote:
>> On 01/09/13 13:36, Jiri Olsa wrote:
>>> split event data into multiple files based on the file
>>> size or time delta specified as an argument to the option.
>>>
>>> Adding multi file '-M' option for record command to store
>>> output perf.data into multiple files based on the size
>>> threshold.
>>>
>>> The threshold is specified either as size (B/K/M/G) or time
>>> (s/m/h) by appending the size with appropriate unit, like:
>>>   -M 5M for 5 megabytes threshold
>>>   -M 1h for 1 hour threshold
>>> The generated name for each data file is appended with sequential
>>> number (prepended by 5 zeros).For default output file name it
>>> will be:
>>>   perf.data-00000
>>>   perf.data-00001
>>>   perf.data-00002
>>>   ...
>>>
>>> Also watermark/wakeup_watermark is set accordingly to get
>>> wake ups more often so we could get close enough to the
>>> file size promise.
>>>
>>> Example:
>>>   $ perf record -M 5M yes > /dev/null
>>>   ^C[ perf record: Woken up 228 times to write data ]
>>>   [ perf record: Captured and wrote 20.246 MB perf.data-[0-4](~884542 samples) ]
>>>   yes: Interrupt
>>>   $ ls -l perf.data-0*
>>>   -rw------- 1 jolsa jolsa 5289856 Aug 16 16:07 perf.data-00000
>>>   -rw------- 1 jolsa jolsa 5296008 Aug 16 16:08 perf.data-00001
>>>   -rw------- 1 jolsa jolsa 5344968 Aug 16 16:09 perf.data-00002
>>>   -rw------- 1 jolsa jolsa 5309144 Aug 16 16:09 perf.data-00003
>>>   -rw------- 1 jolsa jolsa 2358268 Aug 16 16:09 perf.data-00004
>>
>> Did you consider doing this with "perf inject" instead of "perf record"?
>> That way you could get the split exactly right, and you could split the same
>> file different ways.
> 
> right, this could be added into inject command as well

I was really thinking "instead" not "as well" e.g.

	perf record yes | perf inject -M 5M

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