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Commit abc60bad authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo
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perf stat: Display length strings of each run for --table option 



Adding support to display visual aid 'length strings' to easily spot the
biggest difference in time table.

  $ perf stat -r 10 --table perf bench sched pipe
  ...

   Performance counter stats for './perf bench sched pipe' (5 runs):

             # Table of individual measurements:
             5.189 (-0.293) #
             5.189 (-0.294) #
             5.186 (-0.296) #
             5.663 (+0.181) ##
             6.186 (+0.703) ####

             # Final result:
             5.483 +- 0.198 seconds time elapsed  ( +-  3.62% )

Suggested-by: default avatarIngo Molnar <mingo@kernel.org>
Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180423090823.32309-9-jolsa@kernel.org


[ Updated 'perf stat --table' man page entry ]
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent e55c14af

tools/perf/Documentation/perf-stat.txt

+6 −6
Original line number Original line Diff line number Diff line
@@ -123,14 +123,14 @@ spreadsheets. Columns are separated by the string specified in SEP. 
   Performance counter stats for 'perf bench sched pipe' (5 runs):

   Performance counter stats for 'perf bench sched pipe' (5 runs):





             # Table of individual measurements:

             # Table of individual measurements:

             5.379 (-0.176)

             5.189 (-0.293) #

             5.243 (-0.311)

             5.189 (-0.294) #

             5.238 (-0.317)

             5.186 (-0.296) #

             5.536 (-0.019)

             5.663 (+0.181) ##

             6.377 (+0.823)

             6.186 (+0.703) ####





             # Final result:

             # Final result:

             5.555 +- 0.213 seconds time elapsed  ( +-  3.83% )

             5.483 +- 0.198 seconds time elapsed  ( +-  3.62% )





-G name::

-G name::

--cgroup name::

--cgroup name::

tools/perf/builtin-stat.c

+7 −1
Original line number Original line Diff line number Diff line
@@ -1790,9 +1790,15 @@ static void print_table(FILE *output, int precision, double avg) 




	for (idx = 0; idx < run_count; idx++) {

	for (idx = 0; idx < run_count; idx++) {

		double run = (double) walltime_run[idx] / NSEC_PER_SEC;

		double run = (double) walltime_run[idx] / NSEC_PER_SEC;

		int h, n = 1 + abs((int) (100.0 * (run - avg)/run) / 5);





		fprintf(output, " %17.*f (%+.*f)\n",

		fprintf(output, " %17.*f (%+.*f) ",

			precision, run, precision, run - avg);

			precision, run, precision, run - avg);



		for (h = 0; h < n; h++)

			fprintf(output, "#");



		fprintf(output, "\n");

	}

	}





	fprintf(output, "\n%*s# Final result:\n", indent, "");

	fprintf(output, "\n%*s# Final result:\n", indent, "");