Messages in this thread | | | Date | Mon, 02 Sep 2013 12:11:35 +0300 | From | Adrian Hunter <> | Subject | Re: [PATCH 24/25] perf tools: Add multi file '-M' option for record command |
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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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